I believe that many partners are more or less encountered to copper and aluminum two materials for laser welding, copper and aluminum laser welding is a challenging task, because the melting point of these two metals is low, good thermal conductivity, heat diffusion coefficient is large, easy to produce thermal deformation and oxidation. Here are some key points for laser welding of copper and aluminum:
1. Control of heat input: Since copper and aluminum have good thermal conductivity and large thermal diffusion coefficient, it is necessary to control the heat input during the laser welding process in order to avoid generating too much heat leading to thermal deformation and oxidation.
2. Preheating: Before laser welding, copper and aluminum can be preheated to increase their temperature and reduce the thermal stress generated during the welding process, thus reducing thermal deformation.
3. Protective gas: In the laser welding process, protective gas such as argon or nitrogen is required to prevent oxidation of copper and aluminum. Protective gas flow, pressure and quality need to meet the requirements to ensure the quality and stability of the weld.
4. Welding parameters: you need to select the appropriate welding parameters according to the material of copper and aluminum, thickness and welding requirements, including laser power, welding speed, the amount of defocusing.
5. Welding position: copper and aluminum laser welding can be butt, lap or angle welding position. It is necessary to choose the appropriate welding position according to the actual situation to ensure the quality and stability of the weld.
6. Cooling device: During the welding process, a cooling device can be used to cool the welded parts to reduce the thermal stress generated during the welding process and reduce thermal deformation.
It should be noted that the laser welding of copper and aluminum need to strictly control the parameters to ensure the quality and stability of the weld. At the same time, it is necessary to choose the appropriate welding method and process according to the actual situation in order to obtain the best welding effect.
What are some of the key steps and points of the copper and aluminum laser welding process?
Because the laser welding process of copper and aluminum is an efficient and high-precision metal joining method. This process uses the high energy density of the laser beam to locally heat the surfaces of copper and aluminum above the melting point, and then mixes the two metals through a molten pool to achieve a connection between them. The main points are as follows:
1. Material Preparation: Ensure that the surfaces of copper and aluminum are clean and free of oil, oxides or other impurities. This can be achieved by mechanical cleaning, chemical cleaning or laser cleaning.
2. Fixture design: Design appropriate fixtures to ensure precise alignment and stable fixation of copper and aluminum during the welding process. The fixture should be able to withstand the thermal stress and deformation generated during the welding process.
3. Preheating: Due to the good thermal conductivity of copper and aluminum, preheating may be required to increase the temperature of the welded area, reduce thermal stresses, and reduce thermal deformation.
4. Laser welding: Use a laser welding machine to perform the welding. Adjust the laser power, welding speed, defocus amount and other parameters to obtain the best weld quality and stability. Ensure that the laser beam is accurately focused on the junction of copper and aluminum to achieve a good fusion.
5. Protective gas: Use protective gas such as argon or nitrogen during the welding process to prevent oxidation of copper and aluminum. Make sure the protective gas is sufficient and evenly distributed in the welding area.
6. Cooling: After the welding is completed, the welding area can be cooled using a cooling device to reduce thermal stress and minimize thermal deformation.
7. Post-treatment: Check the quality of the weld and remove possible welding defects such as porosity, cracks, etc. Carry out necessary post-treatment on the weld, such as grinding, polishing, etc., in order to obtain the required surface quality.
