How To Detect Cracks Inside Aluminum Die Castings
Apr 26, 2014
Detect whether there are cracks in the aluminum die-casting parts through the following aspects:
1. Detect product 1 through non-destructive testing. Ultrasonic detection of various metal pipe skids, plates, castings, forgings and welds. Ultrasonic testing and ultrasonic thickness measurement. When ultrasonic waves encounter defects such as cracks, voids, segregation, etc. during propagation, the acoustic parameters such as ultrasonic speed, amplitude and frequency will change So change.
2. Magnetic particle inspection is suitable for non-destructive inspection of ferromagnetic materials such as casting, forging and other machined parts.
3. Ultraviolet lamps are inexpensive, highly reliable and easy to operate. The sink leak detection of various pipelines is the inspection of whether the coating is uniform, the inspection of impurities or stains, the semiconductor and biological fields, medical, stage special arts.
4. Radiographic testing can be divided into three types: X-ray, Y-ray and high-energy ray. X-ray photography is based on the attenuation law of rays in materials and the actinic and luminous effects on certain materials. From the point of view of ray intensity, when the ray intensity on the workpiece is JO, the ray passing through the workpiece is weakened to JC due to the attenuation of the ray by the workpiece material. If the workpiece is defective, the ray at this point will pass through When the actual thickness of the workpiece is reduced, the intensity of the rays passing through is JA and JB larger than the intensity of the point without defects. From the perspective of the actinic effect of the rays on the film, the strong part of the rays has a strong actinic effect on the film, which means that the amount of light is large. It feels that the lighter film becomes darker after being processed in the dark room. Therefore, the defects in the workpiece produce black shadows on the negative through the rays, which is the principle of radiographic inspection.
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