Application Analysis on Laser Screw Welding for Body-in-white

Wu Wenyong, Yang Zhi, Yue Shuangcheng

（The GAC R&D Center, Guangzhou 511434）

Abstract：the joints with 2 galvanized sheets were fabricated using laser screw welding, sound weld joints were obtained by regulated parameters and predetermined gap. The results indicate that favorable formation of weld beam could be made by lase screw welding, as the stirring of laser beam, the grain was refined and mechanical shear strength was superior to the joint made by resistance spot welding. The study also shows that the increase of gap between sheets could reduce the nugget diameter of joint, hence sheer strength becomes worse which is still equivalent to the resistance spot weld. With the application of laser screw welding, resistance spot welds and arc welding could be replaced. Meanwhile laser screw welding was characterized with high manufacture efficiency and accessibility which would improve the design freedom of body structure and have great application potential in body in white welding process.

Key words: Laser screw welding, Remote laser welding, Resistance spot welding, Galvanized sheet