The heat treatment temperature of aluminum alloy is generally not high, the highest solution temperature is about 550 degrees Celsius, and the aging temperature is estimated to be lower, about one or two hundred degrees Celsius. Aluminum alloy is the most widely used non-ferrous metal structural material in industry, which has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, chemical industry and other industries. With the rapid development of industrial economy, the demand for aluminum alloy welded structural parts is increasing, which makes the research on aluminum alloy weldability deepen. At present, the most widely used alloy is aluminum alloy.