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Most of the welding jobs are for men, but the baby-faced, gentle and delicate “post-80s” girl in front of her, He is an aerospace “welder”.
Her name is Wang He, she is 36 years old and is a manual welding worker at the Electrical Equipment Technology Center of the Changchun Jingxue Institute of Precision Machinery and Physics of Chinese Science (hereinafter referred to as “Changchun Jingxue Institute”). Over the years, she has participated in the production of more than a dozen aerospace payload projects such as the famous Shenchuan series, Tiangong series, and Chang’e series, and has made indelible contributions to the development of my country’s aerospace industry.
“PCB (Printed Circuit Board) is like the brain of the spacecraft. My job is to solder the components to the circuit board and ensure that it meets the highest international standards.” Talking about his own Mission, Wang He couldn’t hide his pride in his tone.
This task is very simple to say, but if ordinary welding isCompared with sewing clothes, Wang He’s task is the most exquisite “embroidery”. “It is not difficult to weld a qualified solder joint, but the difficulty is to always meet the standards.” Wang He said that the first point of aerospace products is to require high reliability. Aerospace products are expensive, and a small mistake can cost hundreds of millions. A serious loss of yuan.
“I have come into contact with thousands and tens of thousands of devices. The welding requirements of each device are different, and every solder joint must be accurate.” Wang He told reporters: “Of course, aerospace PCB can be welded with high-power magnifying glass and X-rays are used to detect the quality of solder joint tools, but many welding processes cannot be inspected. This is guaranteed by the welder’s solid theoretical foundation, proficient welding skills and high sense of responsibility.”
Therefore, Wang He believes that the most important thing in doing this job is to have a high sense of responsibility and carefulness. In every day’s work, she walks on thin ice. Only when the product in her hand is successfully launched can the stone in her heart drop a little.
In 2008, after two years of study and accumulation, Wang He began to participate in the PCB welding tasks of the Tiangong series spacecraft. “This process is both painful and precious!” Wang He told reporters that at that time, she ignored the sweetness of her wedding and plunged into the project…
After the “Tiangong” was successfully launched, Wang He felt an unspeakable feeling in her heart. My feelings: “It’s like raising a child and watching her grow up little by little. I feel that all the hardships I have endured are worth it. I will have no regrets in my life.”
Wang, who masters the skills of aerospace PCB welding and rework Sri Lankans Escort Crane has been able to use highly reliable welding of all components on aerospace PCB products. Of the nearly one million solder joints she completed, not a single one failed. What is even more unimaginable is that because of her supreme pursuit of perfection, the solder joints completed by her are all exquisite in size and can be described as works of art. As long as the inspection experts LK Escorts see these solder joints, they will know that they were made by Wang HeLK Escorts.
“China’s aerospace industry has been developing, with more and more new technologies and more and more technical difficulties. All we can do is forget the past, work hard to move forward, and continue to work hard with an ordinary heart. Mercedes-Benz.” Wang He said.
In the face of difficulties, Wang He always has a special tenacity. This quality also helps her make up for some design shortcomings in the craftsmanship and save immeasurable losses.
“As long as you think about it, there will always be a solution.” In one mission, due to operator error, multiple pads on the PCB fell off Sri Lanka Sugar Daddy, not only will millions of dollars of equipment be scrapped, but the progress of the project will also be seriously affected. At this critical moment of life and death, Wang He stepped forward, and after two days and two nights of research, he found a unique rework process that quickly repaired the PCB to perfection and won Sri Lanka Sugar Daddy was highly praised by the project leader.
Due to the special nature of the task, Wang He missed the colorful life of women of her age, but she never regretted it. “Due to the confidential nature of the work, many achievements and honors cannot be known to others. In the eyes of others, I am an ordinary woman, but I understand how extraordinary my work is.” Wang He said with a smile. : “When I think of the aerospace products that have been successfully launched and playing a role in space, I am very excited, happy, and proud of it.”
PCB LAYOUT(1) : Component structure and welding process: SMD components, brush the solder paste on the pads through the steel mesh, then stick the components to the pads, and then pass through the reflow oven (this oven mainly has several temperature controls) Area, no need to supply rosin or tin water); wave soldering plug-ins and patches can be soldered. Generally, the patch is fixed at the bottom with red glue, and the plug-in is pulled out at the top, and then pass 2014-12-23 15:55: 12 PCB experience PCB design experience understanding PCB board frame design 1. The design of the physical board frame – be sure to pay attention to the correct size to avoid installation trouble and ensure that the circuit board can be smoothly installed into the chassis, shell, slot, etc. 2. Corner places (For example, the four corners of a rectangular plate) It is best to use rounded corners. – Aspects 2023-11-15 10:44:19 PCB pad appearance + performance highlights [/url] Circular pads – commonly used in single- and double-sided printed boards with a prescribed arrangement of components. If the density of the board allows, the pads can be larger so that they will not fall off during welding. [url=http://www.dzjs.net/upimg/userupSri Lankans Escort/09102014-12-31 11:38: 54The difference between SMD and NSMD in PCB pad design. Correct PCB pad design is crucial for effectively soldering components to the circuit board. For exposed pad assembly, there are two common soldering methods – solder mask definition (SMD) and non-solder mask definition (NSMD). Each method has its own characteristics and advantages. SMD2023-03-31 16:01:45 The detailed explanation of the problem of PCB pad design is very accurate, but elements will appear after reflow soldering Sri Lanka Sugar Welding defects such as offset position and suspension bridge. The basic principles of PCB pad design are based on the structural analysis of solder joints of various components. In order to meet the reliability requirements of solder joints, PCB The following key factors should be controlled in pad design: 1. Symmetry: Pads at both ends2023-05-11 10:18:22 What factors should be controlled in PCB pad design? The position is very accurate, but after reflow soldering, there will be soldering defects such as component position deviation and suspension bridge. **Basic principles of PCB pad design** Based on the structural analysis of solder joints of various components, in order to meet the reliability requirements of solder joints, PCB pad design should master the following key factors: 1. Symmetry: middle 2023-03-10 Sri Lanka Sugar Daddy 14:38:25 The knowledge of PCB pad design is welded and fixed on the PCB, and printed wires connect the pads. Complete the electrical connection of components in the circuit. During the soldering process, if someone does not understand this aspect, it will be very difficult to damage the pads on the PCB, which will seriously lead to the scrapping of the entire circuit board. The editor below will tell you something about the pads 2020- 06-01 17:19:10 Study on the common soldering problems that are common in PCB welding. Study on the common common soldering problems in PCB welding. 2012-08-20 13:54:53 What are the inspection methods of PCB soldering parts? There are many methods for PCB soldering. We mainly introduce the mainstream reflow soldering, which can be divided into single-sided reflow and double-sided reflow. Single-sided reflow is currently rarely used because double-sided reflow can save the circuit board. space, which means that the product can be made smaller, so most of the boards seen on the market belong to the double-sided reflow process. When inspecting the PCB welding part, we can use the above four methods. 2020-10-30 07:54:35 Research on PCB component welding warpage problem This post was originally edited by pcbsun on 2013-2-19 15:02 PCB and components warp during the welding process, which occurs due to stress deformation Weak soldering, short circuit and other shortcomings. Warpage is often caused by temperature imbalance in the upper and lower parts of the PCB 2013-02-19 15:01:17PCB hole plate and solder mask design. This has two advantages. First, it is not difficult to cause bridging due to solder mask deviation during BGA reflow soldering; second, if the lower surface of the BGA directly passes through the wave peak, it can reduce the solder emerging and welding spots during wave soldering. Remelting affects reliability. PCB rapid prototyping starts at 45 yuan, 24 hours 2018-06-05 13:59:38 PCB process hot-pressed tin welding introduction principle and process control The principle of hot-pressed tin welding The principle of hot-pressed tin welding is to first put the tin The paste is printed on the circuit board, and then heat is used to melt the solder and connect the two electronic components that need to be connected. Usually the soft board is welded to the PCB, which can achieve the purpose of being light, thin, short, and small. In addition, you can also use 2017-12-07 17:16:29 PCB desoldering principles/work points/methods/precautions to remove. When desoldering, stand the PCB up, use a soldering iron to heat the solder joints of the components to be removed, and use tweezers or needle-nose pliers to grasp the component pins and pull them out gently. (2) Centralized desoldering method. Since each pin of the resistor is soldered separately, it is difficult to heat them at the same time using a soldering iron. 2021-02-05 15:30:13 What are the methods of PCB desoldering. When desoldering, stand the PCB up, use a soldering iron to heat the solder joints of the components to be removed, and use tweezers or needle-nose pliers to grasp the component pins and pull them out gently. (2) Centralized desoldering method. Since each pin of the resistor is welded separately, it is difficult to heat them at the same time using a soldering iron, which can cause 2021-02-23 16:51:34PCB board welding defects. The reason is that only in this way can targeted improvements be made, thereby improving the quality of the overall tool of the PCB board. Let’s take a look at the causes of welding defects on PCB boards! 1. The solderability of circuit board holes affects the quality of welding tools. Poor solderability of circuit board holes will cause virtual soldering defects, affecting the circuit 2019-05- 08 01:06:52 The pad design dimensions and surface tension in PCB board design have been improved. And if the PCB pad design is wrong, even if the mounting position is very correct, welding defects such as component position deviation and suspension bridge will not easily occur after reflow soldering. Therefore, when performing PCB design, the PCB pad design needs to be paid great attention to. 2018-09-25Sri Lanka Sugar 11:19:47 PCB board selective soldering process: individual solder joints or pins, single row The pin can stop the drag soldering process. The PCB changes position on the solder wave of the soldering tip at different speeds and angles to achieve the best quality of the soldering tool. To ensure the stability of the welding process, the inner diameter of the welding nozzle is less than 6mm. After the flow direction of the solder solution is determined, for different welding needs, the soldering tip is pressed according to 2018-09-10 16:50:02 Effect of soldering mask bridge pretreatment on PCB production Analysis of lead HASL results: Figure 5 is after lead-free HASL Lining. Figure 6 is a cross-sectional view of the lead-free HASL rear solder bridge. Analysis of immersion gold: Figure 7 is the effect diagram of the PCB after immersion gold after welding, and Figure 8 is the cross-sectional view of the solder bridge after immersion gold. Analysis of Intoxicated Tin: Figure. Figure 9 is the soldering bridge of the PCB soldered after immersion tin 2019-08-20 16:29:49 PCBdesign’s experience PCBdesign’s experience 2012-08-20 11:12:36 PCBdesign’s soldering is also very important and not much better. When I first learned electronic design, the welding I was familiar with was to fix a bunch of scattered components one by one according to the schematic diagram and the corresponding position on the PCB, which can ensure the connectivity of electrical appliances. When welding circuit boards under the guidance of seniors, we were prompted to make the welding surface as small as possible 2016-09-28 21:31:06 Analysis of the difficulties of PCB selective welding process In the welding process of PCB electronics industry, there are more and more The store began to focus on selective welding, which can complete all solder joints at the same time, LK Escorts and reduce the cost of giving birth to as low as The lowest, and at the same time it overcomes the problem of reflow soldering affecting temperature-sensitive components. Selective soldering can also be used for future 2017-10-31 13:40:44 PCB selective soldering process difficulty analysis. For example: individual solder joints or pins, single row of pins can perform drag soldering process. The PCB changes position on the solder wave of the soldering tip at different speeds and angles to achieve the best quality of the soldering tool. To ensure the stability of the welding process, the inner diameter of the welding nozzle is less than 6mm. After the flow direction of the solder solution is determined, 2013-09-13 10:25:12 PCB selective soldering technology introduction PCB selective soldering technology introduction PCB circuit board industry process development process, an obvious trend reflow soldering technology. In principle, traditional plug-ins can also be reflow soldered, which is commonly known as through-hole reflow soldering. Its advantage is that it is possible to complete all solder joints at the same time, so that 2012-10-17 15:58:37PCB selective soldering technology is detailed. This post was last edited by eehome on 2013-1-5 09:51 PCB selective soldering Technology Looking back in detail on the process development of the electronics industry in recent years, we can notice that a very obvious trend is reflow soldering technology. In principle, traditional plug-ins can also be used 2012-10-18 16:26:06 PCB selective soldering techniques Specific PCB selective soldering Sri Lankans SugardaddyTechnology Looking back in detail on the technology development process of Sri Lanka Sugar electronics industry in recent years, we can notice that a very obvious trend is reflow soldering technology. In principle, traditional plug-ins can also be used in the reflow soldering process. This is usuallyIt is what is called through-hole reflow soldering. Its advantage is that it is possible to complete 2012-10-18 16:32:47PCB selective welding process characteristics and processes in the PCB electronics industry welding process, more and more shops are beginning to focus on selective welding. Selective soldering can complete all solder joints at the same time, minimizing the cost of childbirth. At the same time, it overcomes the problem of reflow soldering affecting temperature-sensitive components. Selective soldering can also 2018-09-14 11:28:22pcb What are the welding sequences of welding skills? If you want to weld a board more efficiently and reliably, you must abide by certain principles (such as “small first, then big”). You can’t fool around with it, and you don’t just weld which components are pleasing to the eye. . Generally, my process after getting a board is: Print the PCB package diagram (i.e. the pattern printed on the board) 2022-01-13 07:36:02 The problem of virtual soldering during pcb soldering. When it comes to PCB boards, why are there differences between via cover oil, via window opening, and via plug oil? Solve the problem of welding chip components in the welding process 2014-04-02 15:53:50 Apply a large amount of solder, still holding the chip down, and solder the two diagonal pins so that the chip is fixed and cannot move. After soldering the diagonals, recheck whether the chip is aligned. If necessary, you can adjust or remove it and reposition it on the PCB board. 2.3 Start welding all the pins2009-12-02 19:53:10 Whether the soldering patch detection software is soldered well is always a bit inferior to a novice soldering patch. Unexpectedly, after welding, I found that the detection terminal was not connected to the device. After debugging for a long time, I finally found that the swd port was wrong. I started searching for SWD precautions and found different errors. Then I accidentally used a multimeter to detect that SWDIO was connected to the ground. . After processing 2021-08-12 07:24:13 ARM DIYdesign’s Sri Lankans Escort packaging determination of hardware welding time and hardware testing experience ( Best) should be consistent with the PCB, but not too small, that is, the 0805 pad can be used to weld 0603 components, but the 0603 pad is a bit limited for welding 0805 components. 2. Welding of various components. Various technical componentsSri Lanka Sugar have different sizes and shapes, and have different welding methods2012-03-30 10:22:57BGA What are the reasons and solutions for soldering openings in BGA? `2019-12-25 16:32:02 The welding problem is no longer available!Eliminate PCB engineer taking the blame! There is no risk of weak soldering or weak soldering. When manufacturing PCB design packages, the size of the soldering pads needs to be considered to avoid potential quality hazards during assembly. 7. Check whether the pins can contact multiple pads. After the PCB package is completed, the wiring layout has been completed. The BOM model of the purchased components is wrong, and the package name is wrong. 2022-08-31 10:22:55DFMdesign dry goods: BGA The BGA chip of the welding problem analysis board is relatively small and has many pins. The spacing between the pins is so small that it is impossible to route the wiring from the center of the pins. Therefore, the HDI blind buried hole wiring method can only be used to design the PCB, and the pad is placed under the BGA pad. holes, buried holes in the inner layer, and wiring conduction in the inner layer. BGA welding process 1. The purpose of printing tin high solder paste printing is to 2023-03-24 11:52:33 A brief analysis of the commonly used soldering types in the PCBA processing process. Wave soldering (Wave Soldering) is a method used for large-scale childbirth. The automatic welding process is suitable for the welding of plug-in electronic components. The process principle is to send the printed circuit board (PCB) through the preheating area and into the solder wave area to make the pins and pads of the plug-in components 2023-04-11 15:40:07SMT-PCB component structure and pads. 6. The large and small SMT components on the wave soldering surface cannot be arranged in a straight line and must be staggered. This can avoid virtual soldering and missing soldering caused by the “shadow” effect of the solder wave during soldering. 2. Pads on SMT-PCB 1. SMT components on the wave soldering surface, their 2018-09-10 15:46:12allegro Learning Experience 1—Paste Mask: is a non-wiring layer. This layer is used to make a steel film (sheet), and the holes on the steel film correspond to the solder joints of the SMD devices on the circuit board. When welding surface mount (SMD) devices, first cover the circuit board with a steel film (corresponding to the actual pad ), then apply the solder paste, and use a scraper to disassemble and destroy the hmc834 after soldering. I use HMC834 and have used many disassembly processes: manual soldering, hot air gun, and reflow soldering. Many are damaged after welding. No other components on the board are broken, only HMC834 is damaged. The other AD components on the board are not broken no matter how weld them, or they are not broken even when disassembled and assembled, but the HMC834 is broken. Sometimes it breaks after reflow soldering. Is HMC834 that cowardly? How do I need to weld it? 2019-02-22 08:06:50stm32 welding experience Selected materials recommended In the morning, I welded a piece of stm32f103zet6 development board given by a friend. At first, the soldering iron could not be repaired. It turned out that the soldering iron tip had been oxidized, so I had to give up! There’s a new solderConnect, the temperature reaches 450, basically, the welding is very smooth, of course the temperature should not be too high, otherwise 2021-08-03 07:34:08 [Technique] The BGA chip of the BGA package pad routing design board is relatively small , and there are many pins, and the spacing between the pins is too small to route from the center of the pins, so the HDI blind buried hole wiring method designPCSri Lankans EscortB, a hole is drilled under the BGA pad, a buried hole is drilled on the inner layer, and wiring is conducted on the inner layer. BGA soldering process 1 printing tin high solder paste printing goal is to Sri Lankans Sugardaddy2023-03-24 11:51:19【 Transfer] Pay attention to the key points when manual dip soldering of PCB circuit boards. The equipment and solder required are PCB manual dip soldering machines, tin bars, and flux. Principle: Dip soldering is to use a tin furnace to boil a large amount of tin and immerse the soldering surface to coat the solder joints with tin. Both plug-in technology and SMT red rubber surface are required. Introduction to dip soldering: Dip soldering is to insert the components into the PCB2016-09-19 21:09:45 [Transfer] The key points to pay attention to when manual dip soldering of PCB circuit boards. The equipment and solder required are PCB manual dip soldering machines, tin bars, Sri Lanka Sugar flux. Principle: Dip soldering is to use a tin furnace to boil a large amount of tin and immerse the soldering surface to coat the solder joints with tin. Both plug-in technology and SMT red rubber surface are required. Introduction to dip soldering: Dip soldering is to insert components 2016-11-22 22:34:31 [Transfer] PCB selective soldering technology The process characteristics of selective soldering can be clearly selected by comparing with wave soldering Process characteristics of sexual welding. The most obvious difference between the two is that in wave soldering, the lower part of the PCB is completely immersed in the liquid solder, while in selective soldering, only some specific areas are in contact with the solder wave. Since the PCB itself is 2018-06-28 21:28:53 [Transfer] The welding method of chip components, after the pad is tinned (any pads selected on the corners are only plated with very little tin), use tweezers or hands Align the component with the pad, paying attention to align all the edges with pins (the most important thing here is patience!), then press the component on the PCB board with your left hand (or with tweezers) slightly, and use a soldering iron with your right hand to Bet on Tin Pad 2016-10-02 14:54:25 Teach you how to distinguish between wave soldering and reflow soldering in one minute. The strength is higher than that of reflow soldering. The thermal conductivity of electronic components is also better, which can effectively reduce the heat loss after soldering. The void rate is reduced and there is oxidation. [Selective Wave Soldering] Suitable density PCB board, high welding yield,Good quality and low operating cost. Essential differences: [1] Different welding conditions, reflow soldering is through equipment 2023-04-15 17:35:41 A brief discussion with engineers about the pad design in PCB design standard component terminals or leads The width of the footSri Lankans Sugardaddybasically differs. For a correct PCB pad design, if there is a large amount of tilt during patch processing, it can be corrected due to the surface tension of the molten solder during reflow soldering. And if the PCB pad design is wrong, even if the mounting position is very correct, welding defects such as component position deviation and suspension bridge will not easily occur after reflow soldering. Therefore, when performing PCB design, the PCB pad design needs to be paid great attention to. 2017-02-08 10:33:26 Research on PCB electrical measurement process of “D” shaped special-shaped pads with the same size as the solder mask window. PCB component pins should be made with the same shape and the same size as the solder mask window. Pad design can save more space. However, the manufacturing process is affected by equipment accuracy, material characteristics, process capabilities, etc., which will lead to pad deflection, size reduction, poor solderability, and test failure. The article will be based on the “D” shape 2019-08-08 11:04:53 Why does the PCB solder mask need to be windowed? The solder mask of PCB refers to the part of the printed circuit board that needs to be coated with green oil. The positions where the solder mask windows are opened are not covered with ink. The exposed copper is the position of the soldered components after surface treatment. The positions without windows are printed with ink to prevent circuit oxidation and leakage. PCB resistance 2023-01-06 11:27:28Why does the welding connection between FPGA and PCB board fail? FPGAs are used in 81% of electronic systems, including many commercial products and defense products, and most FPGAs use BGA packaging. The BGA packaging form is characterized by small solder balls and small diameter of solder balls. When FGPA is soldered on the PCB board, it is not difficult to cause solder connection failure Sri Lankans Sugardaddy. 2019-08-22 06:14:26What is PCB solder mask? Why should PCB circuit boards be soldered? ) In the processing and manufacturing process, the coating of solder mask ink is a very critical process. The main function of the solder mask on the PCB board is to protect the circuit and prevent conductors from being stained with tin; to prevent electrical short circuits between conductors caused by moisture or chemicals; to prevent defects in the subsequent processes of the PCB board and improper handling in electrical installations. Take the resulting 2023-03-31 15:13:51 What is wave soldering, how to make PCBA assembly automatically solder the gap between the component pins and the pads on the circuit board, so that the components are connected to the circuit boardPick it up. 5. After welding, use the hot air knife to blow away the excess solder to make the solder joint smoother and more uniform. Cool the welded PCB to room temperature to solidify the solder joints and ensure its strength. 2024-03-05 17:57:17 There are too many reasons for talking about what issues should be paid attention to when drawing PCBs from a welding perspective. This article will introduce some points that need to be paid attention to when designing PCB from the perspective of patch welding. According to experience, if these requirements are not followed, it is likely to cause low-quality welding tools, false soldering and even when repairing the PCB. Damage to solder pads or circuit boards. 1. Influence on the quality of PCB welding tools 2021-06-18 17:57:57 PCB welding technology introduces the process of physical and chemical interactions between each other. 2. Introduction to circuit board welding characteristics: The melting point of solder is lower than that of the weldment. During welding, the solder and the weldment are heated together to the welding temperature. The solder melts but the weldment does not melt. The formation of welding relies on the molten solder to infiltrate the welding surface, resulting in metallurgical and chemical reactions. 2010-07-29 20:37:24 I sent a friend some PCB layout designs from welding angles to suggest that for welded devices, the pads may be be removed and the board will be damaged by LK Escorts. Therefore, do not place any SMD components within 5 mm of the long side, as shown below Sri Lankans Escort: D. Do not The problem with drilling holes in PAD is that solder paste will flow into the through holes during reflow, resulting in a lack of tin in the component pads 2023-04-18 14:22:50 Hua Qiu’s article tells you: PCBdesign how to prevent solder mask from leaking PCB windows The solder mask refers to the part of the printed circuit board that needs to be coated with green oil. The positions where the solder mask windows are opened are not covered with ink. The exposed copper is the position of the soldered components after surface treatment. The positions without windows are printed with ink to prevent circuit oxidation and leakage. PCB resistance 2023-01-06 11:40:33 Printed circuit board (PCB) welding fault analysis welding, short circuit and other defects. Warpage is often caused by temperature imbalance in the upper and lower parts of the PCB. For large PCBs, warping will occur due to the decrease in the weight of the board itself. Ordinary PBGA devices are about 0.5mm away from the printed circuit board. If the device on the circuit board is larger, welding will occur as the circuit board cools down and recovers. 2013-10-17 11:49:06 Printed Circuit Board (PCB) Welding Defect Analysis Defects. Contamination on the surface of the circuit board will also affect the solderability and cause defects. These defects include tin beads, solder balls, open circuits, poor gloss, etc. 2.3 Welding defects caused by warpage PCB and components warp during the welding process.Virtual soldering occurs due to stress deformation 2013-09-17 10:37:34 Reflow soldering VS wave soldering motor stirs to form a wave peak, allowing the PCB to be soldered to the component. It is generally used in hand plug-in soldering and SMT glue boards. Reflow soldering is mainly used in the SMT industry. It melts the solder paste printed on the PCB and solders it to the parts through hot air or other heat radiation conduction. 2. Process differences: Wave soldering requires spraying first. 2015-01-27 11:10:18 What is the specific process of reflow soldering? What is the principle of reflow soldering? Soft soldering for mechanical and electrical connections. Reflow soldering is to solder components to the PCB board, and it is for surface mounting components. By relying on the effect of hot air flow on the solder joints, the colloidal flux physically reacts under a certain low-temperature air flow to reach SMD (surface-mount2023-04-13 17:10:36 Reflow soldering principle and process circuit, heating the nitrogen to After the temperature is high enough, blow it to the circuit board where the component has been attached, so that the solder on both sides of the component melts and bonds to the motherboard. 1. Set a reasonable reflow soldering temperature curve and perform regular real-time testing of the temperature curve. Welding should be carried out according to the welding direction during PCB design. 3. Welding 2018-10-16 10:46:28 Based on the issues that should be paid attention to during patch welding, there are many reasons that affect the quality of welding tools. From the perspective of PCB welding LK Escorts, we introduce some key points that need to be paid attention to when designing PCB. According to experience, if these requirements are not followed, it is very likely that It is possible that the quality of the soldering tools is not high, the soldering is weak, and the pads or circuit boards are even damaged when the PCB is repaired. 1. Impact on the PCB2018-09-07 10:21:16 How to solder the BLE module to the PCB I am trying to get. A Culle 21400 to 00 module is soldered to a custom PCB. The pads extend inward from the device outline slightly more than specified to enable hand soldering otherwise, the pad layout conforms to the specifications in the datasheet. , there are enough components on the board to 2018-11-15 15:58:36 How to deal with soldering bridging defects in PCB assembly How to deal with soldering bridging defects in PCB assembly Printed circuit board assembly includes a wide range of techniques, from single Surface through hole insertion into complex double-sided reflow assembly, as well as ball grid array (BGA) devices that require selective wave soldering, can often be seen on 2009-04-07. 17:12:08 How to master the welding technique. Place the soldering iron tip on the solder joint. After the tin on the solder joint melts, pull out the component. Experience: Inspection after welding. After welding, you must check whether there is any missing solder or weak solder. As well as short circuits on components caused by solder flow, it is difficult to detect false soldering. You can use tweezers to clamp the components.Pull gently with your feet. If any vibration is found, repair the soldering immediately. 2013-03-03 22:33:16 How to avoid common false soldering and virtual soldering defects in PCBA soldering? How to avoid common false soldering and virtual soldering defects in PCBA welding? What are the ways? 2023-04-06 16:33:09 Dry information | The key elements of PCB pad design are in very correct positions, but after reflow soldering, welding defects such as component position deviation and suspension bridges will appear. **Basic principles of PCB pad design** Based on the structural analysis of solder joints of various components, in order to meet the reliability requirements of solder joints, PCB pad design should master the following key factors: 1. Symmetry: middle 2023-03-10 11:59:32 Reasons that affect the quality of PCB welding tools are very likely to cause low quality welding tools, false soldering, and even damage to the pads or circuit boards during PCB rework. Reasons that affect the quality of PCB welding tools From PCB design to all component welding to complete a high-quality circuit board, PCB design engineers and even welding processes and welding 2024-01-05 09:39:59 One thing I do about welding patches My experience is shared with my friends. The chip components are very small and not difficult to throw away. I usually stick them under the double-sided tape and solder them one by one. When welding, I don’t need tweezers. I first tap a little tin on the bottom of the pad and then put it on. Place the chip component on the pad and tap a little bit of 502. After condensation, weld directly. The solder joints are round and not weak. The soldering effect is good and the soldering is not bad. My personal experience here seems to be a bugu Leimon. Please forgive me. 2012- 11-10 12:48:53 Manual welding efficiency ushered in a “quality” leap! To realize the interconnection between BOM and PCB, components can be quickly and accurately positioned by manual welding intelligent auxiliary tools to efficiently interconnect BOM and PCB. Bronze uses left-handed soldering and right-handed soldering iron. The components and PCB boards to be soldered are placed on the table, and his eyes are fixed on the BOM list and component assembly diagram. The skill is not important, but whether he can find the correct position is important! It really takes 3 seconds to solder, search 2023-01-05 15:05:24 How to avoid deformation after reflow soldering of mobile phone headset and soft board PCB Hello Master! Our company has a product that uses synthetic stone to carry mobile phone headsets and flexible PCBs (individual). After printing, a synthetic stone cover plate (slotted and hollowed out at the welding point of the cover plate) is added for reflow soldering. The thickness of the steel mesh is 0.15mm. As a result, either the tin will not melt or the headset will be deformed. The headset has a temperature resistance of 80°C; the melting point of the solder paste is 138°C, which is a high-temperature solder paste. I’d like to ask you guys what good advice do you have? 2014-03-31 14:02:26 The new surface welding technology connection method also found that compared with most BGA interconnection solutions, the process inspection after welding is much more accurate. Integrating Solder Charge technology into the design process can provide a variety of advantages over standard BGA connections, including: Design of its mechanical processAllowed soldering 2018-08-30 16:22:23 Introduction and differences between wave soldering and reflow soldering, the pins or solder terminals of electronic components mounted on the pads and pSri Lanka Sugar The pads on the cb are electrically interconnected to achieve the purpose of soldering electronic components on the PCB board. Reflow soldering is generally divided into preheating zone, heating zone and cooling zone. Reflow soldering process: Reflow soldering of printed solder paste mounted components 2020-06-05 15:05:23 Common soldering problems and solutions in wave soldering This article introduces you to the soldering problems encountered in the normal use of wave soldering, as well as the corresponding soldering processing method. A. Lack of solder: The solder joints are dry/incomplete/voidy, the solder in the insertion holes and via holes is not full, and the solder does not crawl onto the pads on the component surface. Reasons: a) PCB preheating 2018-09-18 15:38:13 Solution to the virtual soldering of products after wave soldering, causes of virtual soldering of circuit boards after wave soldering: 1. Component soldering terminals, pins, and printed board substrates The pads are oxidized or purified, or the PCB is damp. 2. The attachment force of the metal electrode at the end of the chip component is poor or a single-layer electrode is used, and the capping phenomenon occurs at the welding temperature. 3. PCB2017-06-29 14:38:10 A common problem with wave soldering machine welding of chip components is that the long axis should be parallel to the welding direction. Widen the pad of the last pin of the SOP (design a tin-stealing pad) bSri Lanka Sugar Daddy, according to the PCB size, Can the preheating temperature c be set for a multi-layer board, how many components are there, whether there are mounted components, etc., the tin wave temperature is 250±5℃, and the welding time is 3~5s2017-06-13 14:44:28 A brief discussion of soldering in PCB design Pad design standards When designing PCB pads in PCB design, you need to design in strict accordance with the relevant requirements and standards. Because in SMT chip processing, the design of the PCB pad is very important. The pad design will directly affect the weldability, stability and heat transfer of the components, which is related to the chip processing 2017-03-06 10:38: 53 In-depth analysis of the difficulties of PCB selective welding process In-depth analysis of the difficulties of PCB selective welding process In the welding process of PCB electronics industry, more and more shops are beginning to turn their attention to selective welding. Selective welding can complete all welding at the same time. 2013-09-23 14:32:50 Reasons for hardware failure: PCB soldering, virtual soldering, solder connection 4, solder paste excess Can the back of the furnace be plump and reflective? 5. Whether the structural part of the connector melts at low temperatures? 6. Does the chip position correspond to the silk screen? After reviewing the above “simple” items, PCB welding processing, then focus on those “profound” topics! `2012-11-21 15:41:50 Basic skills of hardware engineers: Hot air soldering station application skills (2) Solder the pin (see Figure 4). After soldering a pad, the component will no longer move in position, and the tweezers can be released at this time. For chip chips with many pins and multi-faceted distribution, it is difficult to fix the chip with a single pin. In this case, multiple pins are needed to fix the chip. Generally, the method of fixing the pins can be used (see Figure 5). That is, welding and fixing 2020-10-19 07:42:03 Experience traffic: Some thoughts about PCB design are generally inappropriate in size. The former is unfavorable for manual drilling, and the latter is unfavorable for CNC drilling. It is not difficult to drill the pad into a “c” shape, but if it is too hard, the pad will be lost. The wire is too thin, and the large unwired area is not equipped with copper coating, which will easily cause uneven corrosion. That is, after the unwiring area is corroded, the thin wires are likely to be excessively corroded. 2015-05-19 10:26:29 PCB experience summarized by myself. After working for several years, PCB experience summarized by myself 2012-09-12 10:50 :51 Let’s discuss the cleaning of PCB boards after welding. Masters solder PCB boards themselves. How do you clean Sri Lanka Sugar Daddy after welding? I washed it with board washing water, and it was a little sticky and unpleasant. I washed it directly with clean water last time, and then dried it with a hair dryer. I was afraid of rusting those no-clean fluxes and no-clean tins. I still had to use them after soldering. Wash, otherwise it will feel unreliable 2015-03-05 10:25:38 Will the edge damage of the device package welding process have any impact on the device? Our company’s welding procedures for ADI’s products over the years are as follows: When welding for the first time, apply solder on the pads and pins of the corresponding devices on the PCB board, and let the solder on the PCB melt on the soldering station at 200°C. , put LP packaged and LC packaged devices on the PCB board for soldering 2018-09-12 11:19:08 Is there a difference in the pad size of hand-soldered SMD devices? Help: Is there a difference in the size of the pads when manually welding patch components and when mechanically welding patches? Also, is there any difference in the spacing between pads? 2019-09-25 05:35:12 SMD component welding tutorial (detailed explanation with multiple pictures) After fixing, put the soldering wire evenly around the head of the IC pin and connect all the soldering wires. This is the key point of drag soldering! Place the PCB at an angle of 45 degrees, and you can imagine that the soldering wire on the IC pin can move downwards when it is melted! 2012-12-19 17:26:47 2012-12-19 17:26:47 Summarize the experience of manual soldering skills of patch components and use alcohol Clean the flux from the board. Welding method 1. Before welding, apply flux on the pad and treat it with a soldering iron to prevent the pad fromIf the tin plating is poor or oxidized, resulting in poor soldering, the chip generally does not need to be processed. 2. Use tweezers to carefully place the PQFP chip on the PCB board 2011-12-19 16:08:55 Selective soldering process The typical selective soldering process includes: flux spraying, PCB preheating, dip soldering and dragging weld. Flux coating process In selective soldering, the flux coating process plays an important role. When welding is heated and welding is stopped, the flux should be active enough to avoid bridging and avoid 2012-10-18 16:31:31 Welding of ceramic vertical mount packages. CVMP can be mounted vertically (see Figure 1) or laid flat (see Figure 2). Figure 1. Vertical mount package for vertical mounting. Figure 2. Vertical mount package for horizontal mounting. Soldering of CVMP Packages CVMP packages can be soldered using standard reflow techniques. The solder paste stencil is consistent with the package size. Post-SMT 2018-09-12 15:03:30 High-speed converter PCBdesign exposed pad overview layer and ground layer extrusion together how to provide additional capacitance. The third part will discuss the exposed pad (E-Pad), which is an aspect that is not difficult to overlook, but it is crucial to achieve optimal performance and heat dissipation of the PCB design. Exposed pad (pin 0) refers to most modern high-speed IC2018-09-12 15:06:09202 PCB pad welding pad welding technology car same track, book same text, industry leader published on 2022-08- 08 01:03:28
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