X-RAY judgment weld nondestructive testing circuit board defects

Date：2023-01-04 15:11:48Views：460

X-RAY detection realizes the disadvantage of not being able to see through the opaque objects with the naked eye, and is widely used to detect the internal defects of the opaque materials, such as detecting whether there are gold wire abnormalities in the encapsulated IC chip, detecting whether the BGA solder has a high bubble void rate, detecting whether the internal wire core of the wire is broken, and so on. The purpose of detection is achieved through the light and dark images formed by the density difference of different materials. As the mainstream of the market, X-RAY non-destructive testing equipment, although only auxiliary testing, can be used to detect whether there are defects on solder joints.

At present, the solder joint defects of BGA devices mainly include solder bridge, solder bead hole, cavity, dislocation, hole, solder ball leakage, weld joint fracture, and false welding. Due to the particularity of false welding, it is not necessarily 100% detectable, mainly because there is not only horizontal plane but also three-dimensional space between materials.

At present, X-RAY detection technologies mainly fall into two categories: transmission X-RAY images (2D) and cross section X-RAY images (3D CT). At present, the market is dominated by 2D images, but CT is relatively rare. This is mainly because the unit price of CT is too high, which is basically more than 4 million yuan, which is too expensive for small and medium-sized enterprises of PSTN.

For 2D X-RAY detection equipment, it can be divided into offline (semi-automatic) and online (fully automatic). The offline X-RAY detection equipment adopts the manual operation mode to detect and analyze whether the product has defects through manual loading and unloading, and manual positioning. The online X-RAY detection equipment operates independently, without manual intervention, and automatically loads and unloads, automatically detects, and automatically analyzes to determine whether the product is abnormal, and automatically marks. It is very intuitive to see the difference between the online X-RAY inspection machine and the offline X-RAY inspection machine.

The selection of effective and reasonable testing equipment is an effective means for electronic product manufacturers to ensure product quality and reduce costs. It is believed that X-RAY online testing will become the market trend in the future.

The above is the X-RAY NDT related content compiled by the wound core detection team, and I hope it will be helpful to you. Our company has a team of professional engineers and industry elites, and has built three standardized laboratories with an area of more than 1800 square meters, which can undertake a variety of test projects such as electronic component test verification, IC authenticity identification, product design material selection, failure analysis, functional testing, factory incoming material inspection and tape weaving.