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Copper, also known as red copper. Because of its easy processing, casting, welding and cutting process performance, it is widely used in the power industry, light industry, electronics industry and other industries to make electrical and thermal conductivity equipment.
What problems are likely to occur when laser welding machines weld copper?
Laser welding is to use high-energy laser pulses to locally heat the material in a small area, and melt the material to form a specific molten pool. However, due to the low absorption rate of high-reflection materials for fiber lasers, processing is difficult.
1. The thermal conductivity of red copper is large, and the heat transfer speed is too fast, which makes it difficult to fuse the processed parts together, and the heat-affected zone of the processed parts is relatively large.
2. The linear expansion coefficient of copper is very large, and improper operation during welding may cause obvious deformation of the workpiece.
3. Red copper contains a small amount of oxygen and other impurities, which are easily oxidized during the heating process, which can cause thermal cracks in the weld.
4. Pores may occur during deep penetration welding of red copper, which are mainly diffuse pores directly produced by the dissolution of hydrogen in copper, or reaction pores caused by oxidation-reduction reactions.
How does a laser welding machine weld copper?
Copper welding is a common type of processing. Due to the inherent high reflection characteristics of copper, the low absorption rate of laser light and the large linear expansion index are the reasons for the poor welding effect of copper. It is necessary to find the corresponding correct solution to achieve a good laser welding machine welding effect.
At room temperature, increase the laser power density to achieve deep penetration welding of copper materials;
The energy density ratio of the small core diameter of the laser can easily reach the absorption value of copper to avoid light reflection;
Using high-power laser and galvanometer welding head to reduce welding spatter and air holes after welding;
Carry out proper treatment on the copper surface and cut off the gas source that produces pores;
Choose excellent process parameters to make the gas dissolved in the metal float up and escape at the maximum speed;
Reasonable selection of shielding gas and appropriate gas protection measures to improve the strength of gas protection during welding;
The welding head is inclined to weld to avoid damage to the laser due to long-term reflection;
Weaving welding can improve the welding surface quality.
Post time: Aug-11-2023
