In addition to the magnetic material forgings, the penetration test method can also check the surface defects of non-ferromagnetic material forgings, such as cracks, looseness, and folding. Generally, it is only used to check the surface defects of non-ferromagnetic material forgings. The following defects. Eddy current inspection is used to inspect the surface or near-surface defects of conductive materials.
The ultrasonic inspection method is used to inspect internal defects of forgings such as shrinkage, white spots, cracks in the heart, slag inclusion, etc. Although this method is convenient, fast and economical, it is difficult to accurately determine the nature of the defects.
With the development of non-destructive testing technology, new non-destructive testing methods such as acoustic vibration method, acoustic emission method, laser holography method, and CT method have now appeared. The emergence of these new methods and their application in forging inspection will surely The level of quality inspection of forgings has been greatly improved.
Of course, in the actual work, which test methods are used and which test methods are used should be carried out according to the type of forging and the specified test items. When selecting test methods and testing methods, we must consider both advanced nature and practicality and economy. We cannot simply pursue advanced nature, and we cannot use two or more kinds to solve problems by one means. The selection of test methods should accurately determine the nature of the defect and find out exactly the cause of the defect as the starting point. Sometimes the selection of the test method is too advanced and will lead to unnecessary consequences and cause unnecessary losses.