The Influence of Laser Power and Butt Gap on the Droplet Transfer and Weld Formation of Laser Arc Hybrid Welding

Abstract

In this study, an 8mm thick AH36 steel plate was welded using laser + MAG hybrid welding technology. The results show that when the laser power is low, the droplet transition form is droplet transition, the droplet size is larger, and the transition frequency is low. As the laser power increases, the form of droplet transition is jet transition, the droplet size is small, and the transition frequency is high. When the laser power is low, the undercut phenomenon of the weld is serious. With the increase of the laser power, the undercut phenomenon of the weld is improved. Besides, the weld width and welding seam reinforcement will also increase. Laser-arc hybrid welding has a certain gap adaptability. When the laser power is 10KW, the weld profile of 0mm welding gap and 1mm welding gap are basically the same. Properly reducing the laser power is conducive to the larger welding assembly gap of laser arc hybrid welding.