Due to the limitations of traditional wave soldering technology in dealing with soldering surfaces with fine pitch and high-density surface mount components, the use of shielding fixtures to shield surface mount components for wave soldering of through-hole leads has emerged.
- The characteristics of using solder resist fixtures for wave soldering on PCBA remain the same as using the original soldering furnace. The difference lies in the need to place the boards into carriers or trays for the soldering furnace, commonly referred to as through-furnace solder resist fixtures.
- Shielding Fixture Materials The materials used for making fixtures must be antistatic. Common materials include aluminum alloys, synthetic stone, and fiberboard. When using synthetic stone, it is recommended to avoid black synthetic stone to prevent interference with the wave soldering sensor. Select a substrate with a thickness of 5mm to 8mm to make the fixture.
Currently, the main methods used are: ① Metal iron pressing; ② Installation of snap fasteners on the fixture; ③ Production of anti-floating high-pressure fixtures.
Defects in wave soldering quality mainly occur during the wave soldering process on PCBs. Therefore, soldering defects on PCBs mainly manifest as solder bridges, poor solder joint contours, solder balls, icicles, voids, dark solder joints, or bead-like solder joints.
