Laser-assisted MAG high-speed welding process for galvanized sheet

The invention discloses a laser-assisted MAG high-speed welding process for a galvanized sheet, which is characterized in that the galvanized sheet is used as a base material, a carbon steel argon arc welding material is used as a welding wire, a laser-assisted MAG arc is selected as a composite heat source, and a paraxial composite mode that the laser is in the front and the MAG arc is in the rear is adopted for welding. According to the laser-assisted MAG high-speed welding process for the galvanized sheet, the phenomena that a galvanized layer is damaged and zinc plating is burnt out can be avoided while high-speed welding of the automotive galvanized sheet is guaranteed, and the welding seam defects such as humps caused by too high welding speed during welding of the conventional automotive galvanized sheet can be avoided. 本发明公开镀锌板的激光辅助MAG高速焊接工艺，以镀锌板为母材，碳钢氩弧焊材为焊丝，选择激光辅助MAG电弧为复合热源，采用激光在前MAG电弧在后的旁轴复合方式进行焊接。本发明镀锌板的激光辅助MAG高速焊接工艺可以在保证车用镀锌薄板实现高速焊接的同时，避免出现镀锌层被破坏、镀锌烧损的现象，且可以避免常规车用镀锌板焊接时，因焊接速度过高导致的驼峰等焊缝缺陷。