First of all, galvanized sheet needs to be treated before welding. The zinc layer on the surface of galvanized sheet will reflect and scatter the laser beam, which will affect the welding quality. Therefore, it is necessary to use chemical solvents or mechanical methods to remove the galvanized layer so that the laser beam can directly irradiate the metal substrate.
Secondly, select appropriate laser welding parameters. Laser welding parameters include laser power, focal length and welding speed. For welding galvanized sheet, generally choose higher laser power and appropriate focal length to ensure that the laser beam can fully melt the metal substrate, and the welding speed should be moderate to avoid the degradation of welding quality caused by too fast or too slow.
Then, a laser welding operation is performed. Put the weldment on the welding workbench and adjust the position and focal length of the welding head so that the laser beam can accurately illuminate the welding point. Start the laser welding machine, focus the laser beam on the welding point, and melt and connect the metal substrates through the high energy density of the laser beam. During the welding process, the relative position between the welding head and the welding spot should be kept stable to ensure the welding quality.
And finally, carrying out post-welding treatment. After welding, the solder joint needs to be cooled and solidified to ensure the strength and stability of the solder joint. At the same time, the solder joints need to be cleaned and trimmed to improve their appearance and smoothness.
In a word, the laser welding machine needs to treat the galvanized layer, select the appropriate welding parameters, carry out laser welding operation and carry out post-welding treatment. Through correct operation and treatment, high-quality laser welding galvanized sheet can be realized.