What are the quality inspection methods of stainless steel precision casting?

Castings inspection mainly contains size inspection, visual inspection of the appearance and surface, element detection and mechanical properties test, for the provisions of particularly important or forging process is easy to produce problems castings, but also to carry out nondestructive testing work, suitable for professional stainless steel precision casting quality inspection detection technology contains liquid penetration detection, magnetic particle detection, eddy current flaw detection, ray detection, ultrasonic testing and vibration detection, etc. .

A casting surface and near-surface defects in the inspection of.

1, liquid infiltration detection: liquid infiltration detection is used to check the surface of stainless steel precision casting parts in the openings defects, such as surface cracks, surface pinhole and other defects that are more difficult to find with the human eye. Common penetration detection is color inspection, in addition to color inspection, glow penetration detection are common liquid penetration detection methods.

2, eddy current flaw detection: eddy current flaw detection applies to check the surface of the following general shall not exceed 6-7MM deep defects. Eddy current flaw detection is divided into the placement of electromagnetic coil method and over the electromagnetic coil method 2.

3, magnetic particle detection: magnetic particle detection is applicable to the inspection of surface defects and surface defects below a few millimeters deep, which requires DC magnetization equipment and magnetic particle flaw detection before the actual operation of the inspection.

Second, the inspection of internal structural defects of stainless steel precision casting fittings.

For internal structural defects, common non-destructive testing methods are ray detection and ultrasonic testing.

1, ray detection: ray detection, generally using X-rays or γ-rays as the ray source, so the need to cause the ray of the machine and other ancillary facilities, when the product workpiece placed in the ray field light, the irradiance of the rays will also be affected by the internal structure of the casting defects produced.

2, ultrasonic testing: ultrasonic testing can be used to check the internal structure defects, it is the use of the sound beam with high-frequency acoustic balance in the internal dispersion of the casting, encountering the internal structure of the surface or defects after the production of reflective surface and find defects.