Aluminum products are welded in the form of point contact tools to reduce the contact area between the tool and the 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. 5 MPa。 The pressure of the tooling hydraulic system is controlled at 9 ~ 9. 5 MPa.
If the pressure is too small, the purpose of the preset anti-deformation will not be achieved, but if the pressure is too large, the degree of restraint of the aluminum product structure will increase. Due to the large coefficient of linear expansion of aluminum products, the high temperature plasticity is poor, and large thermal stress is easily generated during welding, which may cause cracks in the structure of the aluminum product.
Aluminum product welding protection measures
1. Remove the oxides on the groove and surrounding parts of the workpiece and the surface of the wire by mechanical or chemical methods before welding;
2. Use a qualified protective gas for protection during the welding process;
3. In the gas welding, the flux is used, and the oxide film on the surface of the molten pool is continuously scraped by the welding wire during the welding process.
