PCB News - How to judge the quality of solder joints on PCBA board?

How to judge the quality of solder joints on PCBA board?
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In the process of smt patch processing, the quality of the solder joints of the PCBA board is very important. The quality of the solder joints will not only affect the operation and life of the whole machine, but also affect the beauty. How to judge the quality of the solder joints?

In the smt chip factory, the appearance inspection of the PCBA board is generally carried out in accordance with the requirements of the IPC-A-610 standard. Since there are many types of solder joints, it is difficult to describe them simply. Therefore, we decompose the solder joints into multiple dimensions and evaluate them with a single requirement. This is a way to deal with complex problems, and it is worth learning.

1. The qualification requirements for solder joints of plug-in components in Smt chip processing are shown in Figure 1-8. The pin traces of the plug-in should be obvious and identifiable. This is an important sign for judging whether the short pin is soldered. If it has a spherical appearance, it is generally soldered, which can determine the quality of the solder joint.

2. Figure 2 shows the qualification requirements for bottom solder joints in Smt chip processing. We need to control the quality of the solder joints at the bottom welding end. First, we do not allow the welding end to extend. The width of the welding joint is greater than or equal to 50%. There is no requirement on the side, as long as it is wet.

Qualified solder joint quality usually has the following points:

1. With the welding wire as the center, it is symmetrically formed into a skirt shape.

2. On the solder joint, the connecting surface of the solder presents a concave natural transition, the junction between the solder and the solder is smooth, and the contact angle is as small as possible.

3. The surface is smooth with metallic luster.

4. No cracks, pinholes, slag inclusions.
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