Oct 19, 2020
Aluminum is a good conductor of heat and electricity, and its high density of free electrons makes it a good reflector of light. Laser welding of aluminum alloy requires a higher output power in the initial stage to ensure the necessary power density. When the small hole in the weld pool is formed, its absorption rate of the beam increases rapidly, which promotes the smooth progress of the welding process. However, laser welding of aluminum alloy also has many defects, which are mainly reflected in pores and cracks.
To find a solution to the above problems, the aluminum alloy should be properly surface treated before laser welding, such as electrolytic polishing and grinding, and organic solvents should be used to remove oil stains. It is best to weld within 24 hours after the treatment is completed. Special reminder: In order to avoid damage to the laser head and laser due to reflections, the laser head can be tilted at a certain angle.