Difficulties in Aluminum Alloy Processing and Their Solutions - The Problem of Air Holes

• Challenge: Aluminum alloy can dissolve a large amount of hydrogen gas in the molten state, but it hardly dissolves hydrogen gas in the solid state. When the welding pool cools rapidly, hydrogen gas fails to escape in time, resulting in the formation of pores. The main sources of hydrogen gas are environmental humidity, moisture on the base material and the welding wire surface, as well as the purity of the shielding gas. 

Solution: During welding, it is necessary to avoid conducting the process under conditions where the environmental humidity exceeds 60%; before welding, thoroughly clean the surfaces of the base material and the welding wire of oil, rust, etc., and if necessary, dry the welding wire; use high-purity argon or helium gas, and adjust the flow rate to an appropriate level; select the appropriate current, voltage, and welding speed to avoid excessive or overly cold molten pools, thereby controlling the quality of the weld seam.