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Wave soldering temperature setting and precautions
2022 / 07 / 15
Wave soldering is now the main soldering equipment used for plug-in component soldering. Most of the mainstream electronic products are environmentally friendly lead-free products, so lead- free wave soldering is required . The temperature of wave soldering is about 20 degrees higher than that of leaded wave soldering. There are differences in the preheating temperature and the heating and cooling slopes. Let's share the setting and precautions of wave soldering temperature. 1. Wave soldering temperature setting parameters: 1. The peak temperature range is 255℃~265℃ 2. Preheating temperature is 90℃~120℃ 3. The warm-up time is 80sec~150sec 4. The heating slope is 1~3℃/sec 5. Spoiler + smooth wave = 3 sec~5 sec when eating tin 6. The cooling slope depends on each cooling system, generally 5-12℃/sec can be accepted. Lead-free double wave soldering machine 2. Precautions for wave soldering temperature setting: 1. There is a difference in temperature (1-5°C) between no-load and full-load conditions of the wave soldering furnace trajectory. Is this temperature difference norma
Daily operation specification of lead-free reflow soldering machine
2022 / 05 / 31
Daily operation standard of lead-free reflow soldering machine: 1. When overhauling the machine, shut down the power supply to prevent electric shock or short circuit. 2. The lead-free reflow soldering machine should check the parts on a daily basis, and pay special attention to the fact that the conveyor belt cannot be stuck or fallen off. 3. The temperature measurement equipment cannot be in a high temperature state for a long time. After each temperature measurement, the temperature measurement equipment should be quickly pulled out of the furnace cavity to avoid deformation. When the heating is stopped in individual temperature areas, you should check the corresponding fuse first, and pay attention to high temperature during operation. To avoid burns, open the furnace body during the cooling mode to check whether there is foreign matter in the furnace cavity, and then close the furnace body. 4. Start the lead-free reflow soldering machine to check whether the sound of the hot air motor is abnormal. Check whether the conveyor belt is normal during transportation. Ensure that the kneading and jamming phenomenon ensure that the chain and each sprocket are well engaged and derailed. Check the lubrication status of each roller bearing. If abnormality is found, immediately Press the emergency stop button to prevent equipment damage.
What are the differences between peak welding and reflux welding?
2022 / 04 / 26
Welding is an important part of the design process of printing circuit board, welding is to fix electronic components on the printed circuit board, in PCBA processing, peak welding and reflux welding are two common welding processes, but different scenarios are not the same, so what is the difference between these two welding processes?Next by xiaobian to conduct a detailed analysis. wave-soldering: Peak welding is a batch PCB welding process, which weld the liquid tin melted at high temperature with the component plug-in of PCB plate.The peak welding process consists of four steps: welding agent spraying, precoating, peak welding and cooling. Welding agent: mainly used to remove oxide from the plate, can provide lower surface tension, thermal transmittance and smoother welding process. Preheat: PCB preheat and activates the flux through heat channels. Peak welding process consists of four steps: flux spraying, preheating, peak welding and cooling. Peak w
Why is it called reflux welding, what are the advantages of reflux welding
2022 / 04 / 23
For reflow welding, it can provide help for our production skills, so accurately speaking, why is it called reflow welding, what are the advantages of reflow welding?Next, by xiaobian to share with you an introduction. Why is it called reflux welding Tin paste is made of metal tin powder, flux and other chemicals mixed, but the tin can be said to be very small tin beads independently, when after reflux welding furnace this equipment, after several different temperature, at more than 217 degrees Celsius, the small tin beads will melt, after welder and other catalyst, make countless small particles integrated, that is to make the small particles back to the flow of liquid state, the process is often said reflux, reflux means tin powder from solid back to liquid, and then by the cooling area and back to the solid process.Automatic tin immersion furnace What are the advantages of reflow welding 1. The whole system of reflux welding is designed with one industrial control equipment, which reflects the good stability, compatibility, reliability, and improves the anti-interference resistance of the whole system, so that the system can operate well.
Reason and treatment method of peak welding tin connection
2022 / 04 / 20
Peak welding tin is an electronic product plug-in production of peak welding often see problems, mainly because there are many kinds of reasons, if you want to adjust the peak welding to reduce tin, it is necessary to find out the cause of peak welding tin.Majie Automation below to share the reasons and processing ideas. Reasons for peak-welding tin: 1. The preheating temperature of flux is too high or too low, generally at 100~110 degrees. If the preheating is too low, the activity of flux is not high.Preheat is too high, into the tin steel flux is now gone, but also easy to connect tin; 2. Without the fluder, the fluder may not be good or uneven, and the surface tension of tin in the molten state is not released, resulting in easy attachment to tin; 3. Check the temperature of the tin furnace and control it at about 265 degrees. The zui measures the temperature of the wave peak with the thermometer, because the temperature sensor of the device may be at the bottom of the furnace or in other places.The preheating temperature will cause the components to reach the temperature. During the welding, the tin furnace temperature is low, maybe the welding speed is too fast;
Differences and performance of lead-free reflow welding
2022 / 03 / 07
Lead-free reflux welding is the same tin lead welding temperature to treat lead-free process.This practice is caused by the low temperature and then has many benefits.Like equipment to be replaced, less power consumption, equipment risk of damage and so on.However, this process has high requirements for DFM and reflux welding process.It is necessary for users to have a good grasp of the adjustment principle of reflux welding process, fault compensation and so on.The following shares the characteristics and properties of lead-free reflux welding. Difference between lead-free and lead-reflux welding The overall engineering of SMT lead back welding is not different from lead back welding, still: steel plate printing tin paste, equipment settlement (high-speed patch of sheet forced components, active placement of large components of special-shaped parts), hot air reflux welding, cleaning and quality inspection, etc.Different people are lead-free tin paste melting point rise, poor soldability, empty pan monument increase, easy to burst plate, wet sensitive seal is more likely to suffer and other troubles, it is necessary to change the concept from the beginning.In fact, according to years of mass production experience, the reasons affecting the quality of reflux welding are only: tin paste itself, printing parameters, the quality of reflux welding furnace and the selection of reflux welding curve.Most of the master can deal with the problems.No lead wave peak welding Lead-free reflow welding is the following advantages
Furnace temperature setting in the four temperature zones of the reflux welding furnace
2022 / 01 / 13
In the process of PCBA processing, reflux welding is an important process, with high process difficulty, it is a kind of mass welding process, through the overall heating once welding PCB circuit board above all the electronic components, the process needs experienced by the reflux welding furnace temperature curve, welding to ensure the welding quality, ensure the quality and reliability of the finished products.So, next to introduce the return welding furnace has several temperature zone and furnace temperature setting skills. Return welding furnace has several temperature zone and furnace temperature setting technique The reflux welding furnace has 4 areas, divided into preheating area, constant temperature area, tin melting area and cooling area. Most of the solder paste can be operated in these temperature areas. In order to deepen the knowledge of the ideal temperature curve, the temperature, residence time and changes of the solder paste in each area are introduced as follows: Preheat area: The intention is to heat the PCB plate, to reach the preheat effect, so that it can be fused with the tin paste.But at this time, the heating rate is controlled within the appropriate range, so as to avoid thermal impact, the formation of circuit boards and components damage.The heating slope of the preheating area shall be less than 3℃ / sec, and the set temperature shall be at room temperature of ~130℃.The residence time is calculated as follows: set the ambient temperature is 25℃, if the heating rate is 3℃ / sec / 3 (150-25) is 42s, if the heating rate is 1.5℃ / s, the accounting is (150-25) / 1.5 is 85s.Generally, the ti
Common faults and treatment methods of reflux welding furnace
2022 / 01 / 07
Reflow welding furnace in the process of application will present some large and small faults, some common small faults, if engineers or operators can deal with in time, can prevent the delay in production, but also can save the maintenance costs.The following Xiaobian will share with you the return welding furnace common faults and disposal methods. 1. The conveyor belt speed of the reflux welding furnace is unstable Cause of failure: DC governor motor brush and too much toner. Disposal method: change the carbon brush, clean the toner. 2. The temperature of the reflux welding furnace is unstable and randomly shaken. Disposal method: on the control board, the temperature imitation signal is converted into a digital signal, amplified by IC (6N137), to produce a noise signal. Disposal method: Change to IC (6N137). 3. The temperature of the return welder is normal, but the tin paste does not return. Cause of failure: the heater fan does not turn, because one motor is broken, and short circuit, switch, trip.
Daily maintenance of reflow soldering
2021 / 09 / 26
We all know that in the reflow soldering process, the daily maintenance of reflow soldering is very important. It is not only related to its working performance, but also related to the service life of reflow soldering. Today, we will talk about the daily maintenance and inspection of reflow soldering. Maintenance items now! Reflow soldering Reflow soldering machine maintenance content Maintenance of reflow soldering shell: Wipe the surface of the machine with a soft cloth. Reflow soldering track maintenance: visually check the chain jitter and deformation. Maintenance of the reflow soldering fan: Use a vacuum cleaner to suck up the dust from each exhaust port on the chassis. Maintenance of reflow soldering screw: check for debris on the width adjustment screw and clean it up Clean the reflow soldering sensor: Wipe off the dust on the front and rear sensors of the furnace with a soft cloth. Reflow soldering conveyor belt maintenance: use an oil dripper to add high temperature oil to the conveyor chain, the quantity is 1/2 to 2/3 of the volume of the oil bottle per chain. Abnormal sound during reflow soldering operation: When the chain rotates normally, there is an abnormal sound. Machine surface screw maintenance: visually check if there is looseness or fall, notify the technic
Function and use method of wave soldering machine
2021 / 09 / 26
Wave soldering machine is a welding equipment for electronic products, and it is also a necessary production equipment for electronic product manufacturers. The wave soldering machine is made by piercing the electronic components into the circuit board and welding with the circuit board. But come back, what are the functions and application methods of the wave soldering machine? Lead-free wave soldering Wave soldering The function and application method of wave soldering machine 1. What are the functions of wave soldering machine 1. Use industrial dedicated computer and GUXIN/Mitsubishi PLC control (optional Siemens module), stable and reliable performance 2, multiple maintenance functions (maintenance such as over temperature, emergency stop, overload, short circuit, missing flux, etc.) 3. The wave soldering operation software is easy to operate, powerful in function, fully numerical parameter setting, can save various PCB production prescription files, and the software box function. Lead-free tin furnace 2. Operation steps of wave soldering machine 1. Turn on the wave soldering machine ①Turn on the machine four hours before the formal use every day, and let the tin furnace heat and melt the tin.
The principle and function of the main parameters of wave soldering equipment
2021 / 09 / 26
Wave soldering equipment refers to the melted solder (lead-tin alloy) sprayed into the solder wave crest required by the design through an electric pump or an electromagnetic pump, so that the printed board with pre-installed components passes through the solder wave crest to complete the components Soldering of mechanical and electrical connections between solder ends or pins and printed circuit board pads. The primary process flow of wave soldering: pierce the component into the corresponding component hole → pre-apply flux → pre-baking (temperature 90-1000C, length 1-1.2m) → wave soldering (220-2400C) → cut off the remaining plug-in feet → Check. 1. The principle and effect of wave soldering preheating Eight temperature zone reflow soldering MJ-H8845PCFL 1. When the solvent component in the flux passes through the preheater, it will be heated and evaporated. Then avoid the occurrence of cracking caused by high-temperature vaporization of solvent components when passing through the liquid surface, and ultimately avoid the quality hazard of tin particles. Reflow soldering 2. The parts mounted on the products to be immersed in the tin products slowly rise in temperature when they pass through the preheater, which can avoid damage to the parts caused by the physical effects of the sudden heat during the peak. 3. The preheated parts or terminals will not drastically drop the soldering temperature of the solder joints due to their own low temperature factors when they pass the wave peak, and then ensure that the soldering reaches the temperature requirement within the
Explain the application safety precautions of reflow soldering equipment?
2021 / 09 / 26
Explain the application safety precautions of reflow soldering equipment? There are many applications of reflow soldering equipment, whether it is in life or work, the application of reflow soldering equipment can be seen everywhere. For example, the internal components such as computers and TVs that are usually used are all soldered by reflow soldering equipment welding technology to realize the soldering of electronic components, so that there are parts such as motherboards and circuit boards to assemble computers and TVs. In addition to the above-mentioned fields, there are also many places where reflow soldering equipment is applied to the soldering technology in some medical, scientific research and other fields. Let's share the application safety precautions of reflow soldering equipment. Safety precautions for reflow soldering equipment application: 1. Smt reflow soldering maintenance operators who are not trained by the manufacturer are not allowed to use smt reflow soldering. The maintenance operators must have a basic understanding of the mechanical structure of smt reflow soldering and the operating principle of smt reflow soldering, and be familiar with the contents of the instructions and strictly Operate and maintain smt reflow soldering according to its regulations. 2. Avoid using informal methods to repair and maintain Guangshengde smt reflow soldering. When the tools are insufficient during maintenance, it is not allowed to use some strange tools as substitutes. When there is no meter, you can not use short circuit test to determine whether there is voltage, etc. Use formal tools.
2021 / 09 / 26
Many friends of wave soldering have connected tin when using wave soldering. They are very annoyed. Then what is the cause of wave soldering and tin connection? The main reasons for this situation are the following. Flux activity is not good. The wetness of the flux is not good. The amount of flux applied is too small. Uneven flux coating. The circuit board cannot be coated with flux in areas. Lead-free wave soldering The circuit board is not tinted regionally. Some pads or solder feet are severely oxidized. The wiring of the circuit board is unreasonable (the distribution of components is unreasonable). The direction of the board is wrong. Tin content is not good, or copper is overbranched; [impurities overbranched form tin liquid melting point (liquid line) rise] The foaming tube is clogged and the foaming is not uniform, resulting in uneven flux coating on the circuit board. The setting of the air knife is unreasonable (the flux is not evenly blown). The running speed and warm-up cooperation are not good. Reflow soldering The operation me
Requirements for high-quality lead-free reflow soldering
2021 / 09 / 26
In the reflow soldering process, in addition to the above general soldering conditions, there is a special point, that is, it is necessary to evaporate the chemical components in the solder paste that have no effect after the printing process. This is especially stricter on the first side of the double-sided welding process. No matter what welding technology is selected, it should be ensured that the basic requirements of welding are met to ensure a good welding effect. Reflow soldering is the most important process technology in SMT. The quality of reflow soldering is the key to the reliability of SMA. It directly affects the performance reliability and economic benefits of electronic equipment. What are the basic requirements for high-quality reflow soldering? Reflow soldering 1. Controlled tin flow direction, controlled tin flow direction is also an important part of the reflow soldering process. The molten solder must move in the required direction to ensure that the composition of the solder joints is controlled. The tin absorption phenomenon in the reflow soldering process is the technical details related to the direction of the tin flow. 2. Proper solder joint size and shape. To reflow solder joints with a satisfactory life span, it is necessary to ensure that the shape and size of solder joints meet the requirements of the solder end structure. A solder joint that is too small has a lack of mechanical strength and cannot accept the stress in use, even the internal stress existing after welding. Once fatigue or creep cracking starts to appear during use, the cracking speed is also faster. The poor shape of the reflow solder joints will also constitute a phenomenon of taking the weight down and shorten the life of the solder joints.
Do you know the function and characteristics of reflow soldering
2021 / 09 / 26
Reflow soldering is the most important process technology in SMT. The quality of reflow soldering is the key to the reliability of SMA. It directly affects the performance reliability and economic benefits of electronic equipment. The quality of soldering depends on the soldering method, soldering material, and soldering process used. Technology and welding equipment. Reflow soldering The role of reflow soldering The function of reflow soldering is to send the mounted circuit board of the SMT components into the SMT reflow soldering chamber. After high temperature, the solder paste used for soldering the SMD components is melted by the process of high temperature hot air to form a reflow temperature change, so that the SMD components and The pads on the circuit board are combined and then cooled together. Features of reflow soldering technology 1. The thermal shock to the components is small, but sometimes it will cause greater thermal stress to the components. 2. Only apply solder paste on the required parts, which can control the amount of solder paste applied and avoid defects such as bridging. 3. The surface tension of the molten solder can correct the slight deviation of the placement position of the components. 4. Local heating sources can be used, so that different welding processes can be used for welding on the same substrate.
Talking about the basis of reflow soldering speed and temperature setting
2021 / 09 / 26
The main factors that determine the quality of reflow soldering products are the setting of reflow soldering temperature and reflow soldering speed in the reflow soldering process. The settings of these two key process points determine the quality of reflow soldering products. The following editor will explain the reflow soldering speed and temperature settings based on what is. Reflow soldering 1. The speed and time of reflow soldering should be set according to the temperature profile of the solder paste. Solder pastes of different alloy compositions have different melting points. Even the same alloy composition, due to the different flux composition, its activity and activation temperature are different. The temperature curves of various solder pastes are somewhat different. Therefore, the process parameter settings such as the temperature and speed of the detailed product should meet the temperature curve provided by the solder paste processing plant. Second, the reflow soldering speed and temperature settings should also be set according to the density of the SMA mounted components, the size of the components, and the special requirements of BGA, CSP and other moisture-sensitive components. It not only guarantees the quality of the solder joints but also does not damage the components. Third, the reflow soldering speed and temperature settings should be based on the PCB's data, thickness, whether it is a multilayer board, and the size of the scale, and set the process parameters to ensure that the PCB is not damaged. Fourth, the reflow soldering speed and temperature settings should be set according to the details of the reflow s
How to choose the right reflow soldering equipment
2021 / 09 / 26
With the development of society, there are more and more types and models of reflow soldering equipment. Many reflow soldering manufacturers do not know what to choose when purchasing reflow soldering equipment, so let's take a look with the editor: Reflow soldering 1. The width of the conveyor belt should be satisfied with the large PCB size requirements Choose mesh belt width according to your PCB: PCB 200MM mesh belt application choose 300MM, general: 300 350 400 450 500MM 600MM The larger the selection width, the greater the reflow soldering power, so it is most important to choose the right one. 2, the heating time of the solder paste The temperature of the reflow soldering equipment should follow the requirements of the solder paste. The solder paste manufacturer generally provides a suitable wide window time for each stage of the reflow curve: the preheating and constant temperature time is 120 to 240 seconds, and the reflow time is 60 to 120 seconds/above liquid. time. We found that the average total heating time of 4 to 4½ minutes (240-270 seconds) is a good and relatively conservative estimate. For this simple calculation, we suggest that you neglect the cooling process of the welded profile. Cooling is very important, but generally does not affect the quality of soldering unless the PCB is cooled too quickly. 3, the length and number of heating zones The longer the heating zone length and the mor
What is the principle of the four temperature zones of reflow soldering
2021 / 09 / 26
1. Operating principle of reflow soldering preheating zone: Reflow soldering Preheating is to activate the solder paste, and to avoid the rapid high temperature heating during immersion in the tin, which is a heating action performed to cause defective parts. The goal of this area is to quickly heat the PCB at room temperature, but the heating rate should be controlled within an appropriate range. If it is too fast, thermal shock will occur, and the circuit board and components may be damaged. If it is too slow, the solvent will not evaporate sufficiently, which will affect Welding quality. Due to the faster heating rate, the temperature difference in the reflow furnace at the back of the temperature zone is relatively large. In order to avoid damage to the components due to thermal shock, the maximum heating rate is generally specified to be 4°C/S, and the general rise rate is set to 1~3°C/S. 2. Operating principle of reflow soldering constant temperature zone: The primary purpose of the heat preservation stage is to stabilize the temperature of the components in the reflow furnace and minimize the temperature difference. Give enough time in this area to make the temperature of the larger component catch up with the smaller component, and to ensure that the flux in the solder paste is fully evaporated. At the end of the heat preservation section, the oxides on the pads, solder balls and component pins are removed under the effect of the flux, and the temperature of the entire circuit board is also balanced. It should be noted that all the components on the SMA should have the same temperature at the end of this sec
What are the characteristics of lead-free wave soldering machines?
2021 / 09 / 26
1. The lead-free wave soldering machine is a computer-controlled wave soldering machine. Because it is a lead-free product, it must pass the CE and ROHS certification of the European Union. The lead-free wave soldering machine also has 3 patents. The self-developed software control system has stable functions and affordable prices. Lead-free double wave soldering machine 2. The cost of the stepping motor used in the movement method is higher than that of the cylinder, but it is rarely damaged. It can be used after changing the belt at most two years. 3. The preheating area of the lead-free wave soldering machine uses the preheating method of the upper hot air and the infrared. This preheating method can achieve the best soldering effect when the PCB is soldered. 4. The lead-free wave soldering machine must be connected to the board in synchronization with the rail transportation, and there can be no stacking, squeezing, or jamming. After the PCB board enters the flux spray system, the scanning spray method is used to board the board. Spraying, board stop, and the size of the spray can be fine-tuned. Unlike the traditional spraying system, the spraying or foaming type is always worse when it is turned on. This method is energy-saving and environmentally friendly, and it will not happen as it once did. In case of fire, you can see that there is an air knife here, which blows the residual flux to the side of the recovery box, preventing the flux from entering the preheating zone and ensuring the safety of production. 5. The soldering system of the lead-f
Causes of wave soldering with tin and treatment ideas
2021 / 09 / 26
Wave soldering is a common problem in the production of electronic product plug-in wave soldering. The main reason is that there are many reasons for wave soldering. If you want to adjust the wave soldering to reduce the soldering, you must find out the reason for the wave soldering. Let`s share the reasons and solutions below. Lead-free double wave soldering machine Reasons for wave soldering: 1. The flux preheating temperature is too high or too low, generally 100~110 degrees. If the preheating is too low, the flux activity is not high. If the preheating is too high, the tin and steel will melt; if it is gone, it is easy to connect tin; 2. No flux is used or the flux is insufficient or uneven, and the surface tension of the tin in the molten state is not released, which makes it easy to connect to the tin; 3. Check the temperature of the tin furnace and control it at about 265 degrees. It is best to use a thermometer to measure the temperature of the peak when the peak is raised, because the temperature sensor of the equipment may be at the bottom of the furnace or other locations. Insufficient preheating temperature will cause the component to fail to reach the temperature. During the soldering process, due to the large amount of heat absorbed by the component, it will lead to poor tin drag and form continuous tin; it may also be the temperature of the tin furnace is low or the welding speed is too fast; 4. Regularly check and analyze the tin composition. It is possible that the content of copper or other metals exceeds the standard, which will reduce the fluidity
Talk about the defects and solutions of lead-free wave soldering
2021 / 09 / 26
Lead-free wave soldering has higher temperature, poor wettability, smaller process window and more difficult quality control than reflow soldering. The following editor will talk about the countermeasures that need to be solved for these defects of lead-free wave soldering. Lead-free double wave soldering machine 1. The solder used for the lead-free wave soldering machine usually adopts Sn-0.7Cu or Sn-0.7Cu-0.05Ni, the melting point is 227℃, and the soldering temperature is 250-260℃. Adding a small amount of Ni to Sn-Cu solder can increase fluidity and elongation. Lead-free wave soldering machines can also use Sn/Ag/Cu. Sn/Ag/Cu solder is generally not recommended, except because the cost of Sn/Ag/Cu solder is relatively high, and Ag will also corrode the Sn pot, and the corrosion effect is more Sn is more serious. 2. The temperature of the solder in the lead-free wave soldering Sn pot is as high as 250-260℃. Sn will dissolve the Sn pot at high temperatures. The higher the temperature, the more serious the corrosion. Moreover, the Sn component of the lead-free solder accounts for 99%, which is more There is more than 40% lead solder. If a traditional stainless steel pot is used for lead soldering, pot leakage will occur in about three months. Therefore, the Sn pot of the lead-free wave soldering machine is required. The nozzle is resistant to high temperature and corrosion. At present, titanium alloy steel pot is generally used. Due to the poor wettability of lead solder and the small process window, it is required to reduce the temperature difference on the PCB surface during soldering. The temperature of the Sn pot is even.
How to maintain reflow soldering?
2021 / 09 / 26
1. Punctually clean the surface of the equipment every day for 5S. When picking up, stop using corrosive liquids such as plate washer water to pick up the surface of the equipment. The rags after use must be disposed of in time and cannot be left on site to prevent the rags from flowing in. Inside the device Reflow soldering 2. Check the operation of the cooling fan of the reflow soldering machine every day, and pick up the dust on the fan blades in time to extend its service life 3. Check the operation of the equipment every day, including whether there is any damage to the outside of the equipment and whether there are abnormal noises in the operation of the equipment. 4. Punctually check whether the transmission chain is deformed and the chain is jammed, if any, it should be reported to the repairer in time 5. Check each temperature zone through the temperature curve, and deal with problems in time to prevent damage to the PCB board. 6. Rules for punctual cleaning 7. Various inspection requirements during equipment operation, including roads, parts, content, standard conditions, parameters, cycle (time), inspectors, etc. 8. Cleaning methods for common defects in homework
Maijie teaches you how to choose reflow soldering?
2021 / 09 / 26
With the development of science and technology, electronic products and PCB boards in the electronics industry are constantly updated. Traditional welding is the method of plug-in welding. Then, as the demand for circuit board functions increases, the number of plug-ins must also be increased. When the area of the board does not increase, the number of plug-ins increases significantly, and the position is not enough, and too many plug-in electronic components are easy to generate heat and consume high energy. Therefore, the electronics industry must overcome this bottleneck and replace certain plug-in components with chip components. Compared with plug-in components, the size of chip components is much smaller, so the advantages are also very obvious. In the future, the trend of electronic products will inevitably be that more and more plug-in components are replaced by chip components. However, after the production of chip electronic components, the corresponding chip soldering technology also appeared at a historic moment, so it has reflow soldering technology. Lead-free reflow soldering With the continuous improvement of heat transfer efficiency and soldering reliability, reflow soldering equipment is constantly updated. The initial process is rough. The first generation of reflow soldering is hot plate reflow soldering equipment. The second generation reflow soldering is infrared heat radiation reflow soldering. The third generation reflow soldering is hot air reflow soldering. In the future, there will be fourth and fifth generation reflow soldering equipment, but the cost is higher and suitable for large-scale chip soldering production.
Reflow solder joints can recover the causes of poor wetting
2021 / 09 / 26
A good reflow profile should be a temperature profile that can achieve outstanding soldering of various surface mount components on the PCB to be soldered, and the solder joints not only have outstanding appearance quality but also have outstanding internal quality. To achieve a good reflow soldering temperature profile, there is a certain connection with all the production processes of reflow soldering. Cold solder formed by poor wet reflow solder joints In the reflow soldering process, there is a substantial difference between the dim gloss of the reflow solder joint and the dim phenomenon that occurs when the solder paste is not completely melted. When the circuit board coated with solder paste passes through the furnace where the high-temperature gas is facing, if the peak temperature of the solder paste cannot be reached or the reflow time is not satisfied, the activity of the flux will not be released. The oxides and other substances on the surface of the component pins cannot be purified, resulting in poor humidity during reflow soldering. Reflow soldering machine The hazards of bad wet reflow solder joints The more severe situation is because the set temperature is not good, the soldering temperature of the solder paste on the surface of the circuit board cannot reach all the necessary temperatures for the phase change of the metal solder in the solder paste, which leads to the occurrence of cold soldering at the reflow solder joint. Or because the temperature is not good, some residual flux inside the solder p
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.