Solderability Evaluation
Evaluation of solderability on component leads and printed circuit board terminations determines the capacity of a surface to form a secure metallic bond. The dip and look test represents the primary qualitative method for this assessment by exposing specimen surfaces to molten solder and examining the resulting coverage. This procedure evaluates whether component terminals are free of contaminants and capable of proper wetting during mass assembly.
Test Execution
Technicians perform the procedure by first coating the test specimen with a specified flux before immersing it into a solder bath at a controlled temperature and speed. After a brief immersion period, the specimen is withdrawn and allowed to cool for visual examination under magnification. The test highlights issues like dewetting or non-wetting across the lead surfaces.
Operators look for a smooth and continuous coating of solder that covers at least ninety-five percent of the tested area to pass the board according to IPC standards.
Production Impact
Inadequate solder coverage on component leads translates directly into poor solder joint integrity during reflow. Utilizing the dip and look test helps prevent costly rework by identifying oxidized or contaminated component finishes before they reach the high-speed pick and place machines.
