Nondestructive testing technology plays an important role in workpiece quality inspection due to its non-destructive, efficient and fast characteristics. It can quickly detect defects on the surface of workpieces without damaging the workpieces. However, nondestructive testing is not able to detect hidden defects inside the workpiece, such as pores and shrinkage holes.

To make up for this shortcoming, "metallographic testing" as a destructive testing method came into being. This method can accurately detect micron-level defects inside the casting by cutting specific sections of the casting for precise analysis. Although metallographic testing is impeccable in accuracy, its cost is relatively high and the testing process is time-consuming. More importantly, the workpiece being tested cannot be restored after the test and can only be used once, which undoubtedly increases production costs and resource consumption.

So is there a fast, accurate, and relatively low-cost testing method? The answer is: X-Ray nondestructive testing.