6 Difficulties in Welding Aluminum Alloy By Laser Welding Machine.

In applications, aluminum alloy materials are more common. Aluminum alloy has the following characteristics: light weight, non-magnetic, good low temperature performance, good corrosion resistance, good formability, etc., so it is widely used in various welded structural products. Using aluminum alloy instead of steel plate for welding, the structural weight can be reduced by more than half.

When welding aluminum alloys, there are usually the following difficulties:

1. Aluminum alloy welding is easy to produce pores;

2. Aluminum alloy welding is prone to hot cracks;

3. The linear expansion coefficient of the weld is large, which is easy to cause welding deformation;

4. The welding joint of aluminum alloy has serious softening and low strength coefficient, which is also the biggest obstacle to the application of aluminum alloy;

5. The surface of the alloy is prone to produce a refractory oxide film (the melting point of A12O3 is 2060°C), which requires a welding process with high power density;

6. The thermal conductivity of aluminum alloy is large (about 4 times that of steel), and the heat input is 2 to 4 times larger than that of welded steel at the same welding speed.

Therefore, the welding of aluminum alloys requires high-efficiency welding methods with high energy density, low welding heat input, and high welding speed.