In recent years, the rapid development of electronic products, IC integrated circuit technology, more and more miniaturization of electronic products, precision, electronic products inside the main board is getting smaller and smaller. And the components within such products are more inclined to packaging, so there is a large number of IC, BGA patch demand. Such IC pins more and more, the finer, more dense, and like BGA and CPU and other types of IC are hemispherical, and located at the bottom position, through the artificial eye simply can not see the quality after reflow soldering. Therefore, to check the soldering quality of such ICs, X-ray machine inspection equipment must be used, so X-RAY has been rapidly developed in recent years.
The detection before reflow oven is basically carried out manually or AOI machine, which can detect the daily IC (such as QFP/SOP) soldering quality, because the pins of such ICs are exposed on the outside, AOI can detect the soldering quality, and with the pins at the bottom of the IC, internal (such as BGA/QFN), AOI and manual naked eye can not detect its soldering quality, so it is necessary to use X- Ray, through the X-ray penetration of the formation of the spot to determine whether the solder ball is completely welded, there is no false solder solder and other undesirable issues.
1. Welding process defect detection coverage of 98%, especially the advantages of X-rays on BGA, CSP and other solder joints hidden device inspection.
2. Detection range, wide coverage, advance detection of material good: If the PCBA is judged to be faulty, suspected of PCB inner layer alignment breakage, X-ray can quickly check, or BGA / CSP and other materials in advance detection found bad, to avoid defective materials into the production line, resulting in rework, waste of manpower and material resources, etc..
3. Have higher stability, reliability testing defect analysis, such as: internal solder ball false solder, air holes and poor molding.
X-ray has many advantages, but there are still some disadvantages, for example, because the X-ray has a radiation effect, can not be set up online detection, the need for a separate X-RAY test room, then you need off-line testing, if it is a large number of orders, the capacity will not be able to keep up, can not guarantee delivery, etc.. Therefore, the use of X-RAY needs to be based on the actual situation of the product, customer requirements to decide whether to use.
