It is more difficult to deal with the pores of aluminum alloy die castings after welding, mainly because there are too many impurities. Let's follow the China Die Casting Supplier to see the reasons for the pores of aluminum alloy die castings:

1. The main cause of pores is caused by pores and shrinkage. Most of the pores are round, and most of the shrinkage is irregular.

2. The reason for the pores: during the punching and solidification process of the molten metal, the gas invades round holes on the surface or inside of the casting; the gas from the paint invades the round holes; the gas content of the alloy liquid is too high, and the solidification The precipitation will also produce round holes.

3. Causes of shrinkage:

① In the process of solidification of molten metal, shrinkage holes are generated due to the shrinkage of the volume or the failure of the final solidified part to be fed by the molten metal.

②The uneven thickness of the casting or the local overheating of the casting will cause a certain part to solidify slowly, and the surface will form a recess when the volume shrinks.
　　

Due to the existence of pores and shrinkage holes, the surface treatment of die-casting parts is very troublesome. The holes may enter the water. When painting and electroplating are carried out after baking, the gas in the holes will be heated and expanded, or the water in the holes will become steam and volume. Expansion, resulting in blistering on the surface of the casting, so appropriate methods must be used in production to solve the causes of these defects.

Through the above introduction, Zinc Die Casting Factory hopes that you can simply refer to the content of this article in future use.