Aluminum welding Welding characteristics: aluminum and aluminum alloy have strong thermal conductivity and large heat capacity, large coefficient of linear expansion, low melting point and low temperature strength. The welding is difficult, and certain measures should be taken to ensure the welding quality. Pipe and wire cleaning, the surface of the wire and the 50mm sides of the wire are cleaned with acetone, and the surface oxide film is brushed with stainless steel wire to expose the metal luster. The cleaned hole must be welded within 2 hours. The wire is placed in an unused cylinder and must be used within 8 hours, otherwise it will be reprocessed. The tungsten rod is made of tantalum tungsten rod, the argon gas is not less than 99.96%, and the water content should not be more than 50mg/m3. The ambient temperature should not be lower than 5 °C, otherwise it should be preheated to 100~200 °C before welding, relative humidity control

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