In PCB Assembly, due to many high-precision circuit boards have a large number of BGA and IC, the core components of the package cannot directly observe the internal welding state from the surface after soldering. Therefore, PCBA factory must be equipped with relevant testing equipment. The test equipment for this type of welding mainly X-Ray.
So what does Cross Section Test do? Its main application link is still on the PCB board, and the quality of the PCB board is sliced and tested. However, if there are major quality abnormalities in the SMT patch, it is also necessary to slice and inspect the special parts of the entire soldered circuit board. Both are internal conditions for soldering circuit boards, but the application links are different.
What is X-Ray Test?
X-ray is mainly used for the emitter in the machine to emit high-energy electrons to generate X-ray for sample penetration imaging. Due to the different density of each structure in the sample, the image displayed when X-ray penetrates different objects will have black and white grayscale differences, thereby showing the location and shape of the defects in the sample. X-ray inspection is a non-destructive sample analysis, other tests can be carried out later.
X-Ray Test Application
1. Observation of internal defects of IC package (disconnections, packaging material holes, cracks, etc.);
2. Observe the welding state of the assembled electronic circuit board (such as abnormal conditions such as empty welding, pilling, bridging, etc.);
3. Analysis of the porosity ratio of solder joints;
4. Observe various materials from the front, side and oblique angles;
5. Observe the filling of the porous material.
Application of Cross Section Test
Mainly used for destructive detection of abnormal parts of samples. First, take samples of abnormal parts, then seal and cure the modified parts with resin, then grind and polish, and finally zoom in and inspect under a microscope.
Compared with the frequency of using X-ray, the probability of using cross section test is very low, and it is not very common for us.
