Here comes main reasons for the failure:

1. Components foot/ legs defective: coating, pollution, oxidation, common surface;

2. Solder pad rejected: coating, pollution, oxidation and warping;

3. Poor quality of soldering parts: composition, excessive and oxidation;

Here soldering parts normally including: soldering wire, soldering rod, brazing and soldering alloy.

4. Soldering flux quality problem: low welding resistance, high corrosion and low SIR;

5. Poor control defect of processing parameters: design, control and equipment;

6. Other auxiliary material defects: adhesive, cleaning agent.

PCBA soldering failure has a great influence on circuit performance, therefore, how to improve the design process, structure parameters, welding process, solder joint reliability, improve the yield of PCBA processing during PCBA fabricating, be a constantly job for all PCB related workers.

Any other points or suggestions for the above?

Or any request for our PCB (printed circuit board) or PCBA (PCB with components soldering), please feel free to contact us.