What are the reasons for PCB board welding defects?
1. The solderability of the PCB circuit board holes significantly impacts soldering quality. Poor solderability in the PCBA circuit board holes can lead to soldering defects, which compromise the parameters of the circuit components, resulting in unstable conduction for both the components and the internal traces. This can ultimately cause the entire circuit to malfunction.
2. Welding defects can arise from warpage; during the soldering process, both the PCB and its components may warp, leading to issues like cold solder joints and short circuits due to stress-induced deformation. Warpage is often the result of temperature imbalances between the top and bottom sides of the circuit board. In the case of larger PCBs, the board’s own weight can contribute to warping.
3. The design of the PCB circuit board has a direct effect on welding quality. When the circuit board size is excessively large, while soldering may be easier to manage, longer printed traces increase impedance and drive up costs.
If the PCB is too small, heat dissipation will be inadequate, and controlling the welding process becomes challenging. Additionally, adjacent lines may interfere with one another, necessitating optimization in PCB design.
a. Minimize the distance between high-frequency components to reduce EMI interference.
b. Heavy components should be secured with brackets before soldering.
c. Consider heat dissipation for heating components, ensuring that heat-sensitive components are distanced from heat sources.
d. Arrange components as parallel as possible; this not only enhances aesthetics but also facilitates welding, making it suitable for mass production.
During the dip soldering and assembly of PCB circuit boards, SMT chip processing manufacturers involve numerous employees or customers in tasks such as component insertion, ICT testing, PCB sub-boarding, and manual soldering. Other operations include installing screws, rivets, manually pressing in crimp connectors, and handling PCBA circulation. A common practice during these operations is to hold the circuit board with one hand, which can lead to failures in BGA and chip capacitors. The main concern lies in the risks associated with handling the PCB board with one hand.
(1) Holding the PCB with one hand is generally acceptable for small, lightweight boards without BGA or chip capacitance. However, for larger, heavier boards with BGA and chip capacitors on the sides, this practice should be avoided, as it can easily compromise the solder joints of BGA, chip capacitors, and even chip resistors. Consequently, process documentation must specify how to properly handle the circuit board.
The phase where one-handed holding is most common occurs during the circuit board circulation process. Whether retrieving from the assembly line or placing the board, many individuals tend to unconsciously use one hand for convenience. When manually soldering, attaching heat sinks, or installing screws, it’s typical to hold the circuit board with one hand while performing other tasks with the other. Although these actions may seem routine, they often conceal significant quality risks.
(2) Installing screws: In many SMT chip processing facilities, to cut costs and eliminate the need for tooling, screws installed on PCBA often lead to deformation due to uneven component surfaces. This unevenness can create stress on sensitive solder joints, increasing the risk of cracks.
If you have any PCB manufacturing needs, please do not hesitate to contact me.Contact me
1. The solderability of the PCB circuit board holes significantly impacts soldering quality. Poor solderability in the PCBA circuit board holes can lead to soldering defects, which compromise the parameters of the circuit components, resulting in unstable conduction for both the components and the internal traces. This can ultimately cause the entire circuit to malfunction.
2. Welding defects can arise from warpage; during the soldering process, both the PCB and its components may warp, leading to issues like cold solder joints and short circuits due to stress-induced deformation. Warpage is often the result of temperature imbalances between the top and bottom sides of the circuit board. In the case of larger PCBs, the board’s own weight can contribute to warping.
3. The design of the PCB circuit board has a direct effect on welding quality. When the circuit board size is excessively large, while soldering may be easier to manage, longer printed traces increase impedance and drive up costs.
If the PCB is too small, heat dissipation will be inadequate, and controlling the welding process becomes challenging. Additionally, adjacent lines may interfere with one another, necessitating optimization in PCB design.
a. Minimize the distance between high-frequency components to reduce EMI interference.
b. Heavy components should be secured with brackets before soldering.
c. Consider heat dissipation for heating components, ensuring that heat-sensitive components are distanced from heat sources.
d. Arrange components as parallel as possible; this not only enhances aesthetics but also facilitates welding, making it suitable for mass production.
During the dip soldering and assembly of PCB circuit boards, SMT chip processing manufacturers involve numerous employees or customers in tasks such as component insertion, ICT testing, PCB sub-boarding, and manual soldering. Other operations include installing screws, rivets, manually pressing in crimp connectors, and handling PCBA circulation. A common practice during these operations is to hold the circuit board with one hand, which can lead to failures in BGA and chip capacitors. The main concern lies in the risks associated with handling the PCB board with one hand.
(1) Holding the PCB with one hand is generally acceptable for small, lightweight boards without BGA or chip capacitance. However, for larger, heavier boards with BGA and chip capacitors on the sides, this practice should be avoided, as it can easily compromise the solder joints of BGA, chip capacitors, and even chip resistors. Consequently, process documentation must specify how to properly handle the circuit board.
The phase where one-handed holding is most common occurs during the circuit board circulation process. Whether retrieving from the assembly line or placing the board, many individuals tend to unconsciously use one hand for convenience. When manually soldering, attaching heat sinks, or installing screws, it’s typical to hold the circuit board with one hand while performing other tasks with the other. Although these actions may seem routine, they often conceal significant quality risks.
(2) Installing screws: In many SMT chip processing facilities, to cut costs and eliminate the need for tooling, screws installed on PCBA often lead to deformation due to uneven component surfaces. This unevenness can create stress on sensitive solder joints, increasing the risk of cracks.
If you have any PCB manufacturing needs, please do not hesitate to contact me.Contact me
