Aluminum alloy castings and prevention of the formation of pores

Aluminum alloy castings

Pinhole is a common casting process forms pores , some impact on the quality and the quality of the finished product , are casting defects. This mostly hydrogen pinholes formed during casting into the water vapor produced by decomposition of the resulting casting.

For pinhole formation of aluminum alloy castings there are ways of prevention , in order to quality castings , through the production practice, we generated for different situations pinhole one described.
1.Seriously ready to work when melting and pouring.
2.Strict accordance with the technical rules for processing, melting torch in the process, to strive to achieve rapid melting fast , shortening the solution at high temperature residence time .
3.Strengthen preventive measures in the wet season or rainy season cast aluminum air is humid , we should take extra precautions to prevent the gas protection measures, smelting equipment, ingot molds , crucibles, etc. must be in strict accordance with specifications charge preheating , taken to avoid excessive moisture and oil, etc. , causing all kinds of pinholes .
4.Gas refining to remove aluminum gas.
5.Increase gas solubility in the alloy , aluminum alloy gas removal.