First of all, the galvanized layer needs to be treated before welding galvanized sheet. The zinc layer on the surface of the galvanized sheet will reflect and scatter the laser beam, affecting the quality of the weld. Therefore, the galvanized layer needs to be removed using chemical solvents or mechanical methods so that the laser beam can be directed onto the metal substrate.
Second, choose the appropriate laser welding parameters. Laser welding parameters include laser power, focal length, welding speed and so on. For welding galvanized sheet metal, generally choose a 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, in order to avoid too fast or too slow to lead to a decline in welding quality.
Then, the laser welding operation is performed. Place the weldment on the welding table, adjust the position and focal length of the welding head so that the laser beam can accurately irradiate the welding point. Start the laser welding machine, focus the laser beam on the welding point, and melt and join the metal substrates together by the high energy density of the laser beam. During the welding process, the relative position of the welding head and the welding point should be kept stable to ensure the welding quality.
Finally, post-welding treatment is performed. After the welding is completed, the welding point needs to be cooled and cured to ensure the strength and stability of the welding point. At the same time, the welding point needs to be cleaned and trimmed to improve the appearance and finish of the welding point.
In short, the laser welder needs to treat the galvanized layer when welding galvanized sheet, select the appropriate welding parameters, perform laser welding operations, and carry out post-welding treatment. Through correct operation and treatment, high quality laser welded galvanized sheet can be achieved.