2025-06-09
• Challenge: When aluminum alloy comes into contact with air, it tends to form a dense layer of aluminum oxide. The melting point of this layer is as high as 2050°C, which causes the molten pool to fail to melt and fuse properly during welding, resulting in defects such as slag inclusion, incomplete fusion, and insufficient penetration.
• Solution: Before welding, remove the oxide film using chemical or mechanical methods, such as soaking in alkaline or acidic solutions, scrubbing, or using tools like stainless steel brushes, sandpaper and grinding wheels for grinding; during the welding process, increase the use of protective gases like argon to prevent re-oxidation; when performing tungsten inert gas welding, select an AC power supply to utilize the cathode cleaning effect to remove the oxide film; for gas welding, use a flux that removes the oxide film.