Protective measures for aluminum alloy welding

    For aluminum alloy welding, it is better to use point contact tooling to reduce the contact area between tooling and workpiece. If the tooling is in surface contact with the workpiece, it will quickly take away the heat of the workpiece and accelerate the solidification of the molten pool, which is not conducive to the elimination of weld pores. The pressure of the tooling hydraulic system is best controlled at 9～9.5 MPa.
　The pressure is too small to achieve the purpose of anti-deformation, but too much pressure will increase the restraint of the aluminum alloy structure. Due to the large linear expansion coefficient of aluminum alloy and poor high-temperature plasticity, large thermal stress is easily generated during welding, which may cause cracks in the aluminum alloy structure.
Aluminum alloy welding protection measures
　 1. Use mechanical or chemical methods to remove oxides on the groove and surrounding parts of the workpiece and the surface of the welding wire before welding;
　 2. Qualified shielding gas should be used for protection during welding;
　 3. In the gas welding, flux is used, and the oxide film on the surface of the molten pool is constantly picked up by the welding wire during the welding process.

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