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It is very important to test the Custom Metal Stampings:
Method 1: touch test
First wipe the surface with gauze, and then test the personnel to bring touch gloves, and along the Metal Stampings of the longitudinal touch. It is a quick and effective method, but it needs some experience to do it.
Method two: flexible yarn net polishing
First with gauze to wipe the surface clean, then use the flexible sand net to close to the stamping parts surface, and along the longitudinal grinding the surface and to check the surface indentation or pitting.
Methods: three oil test
With the gauze surface clean, then oil for its entire surface, pay attention to maintain a consistent direction of oil. After the inspection under strong light, if there is pitting, ripple etc.