采用脉冲式NdYAG激光器作为焊接热源，对镀锌钢板和AISI 304不锈钢板进行非熔透型激光叠焊，通过控制焊接工艺，使得焊接接头在满足强度要求的同时底面无痕迹，以保证不锈钢板的外观质量。通过研究电流、焊接速度、离焦量对焊缝熔深、熔宽和强度的影响规律，对工艺参数进行了优化；焊接最佳工艺参数为I=350 A, V=100 mm/min, ΔF=-1 mm,f=4 Hz,W=10 ms，此时的抗剪强度达到使用要求，不锈钢板表面无焊接痕迹；焊缝组织细而致密，为板条状马氏体组织和残余奥氏体，靠近镀锌板侧还有一定的珠光体组织；由于有马氏体硬化层的存在，焊缝区和焊接热影响区的显微硬度比母材高。

Galvanized steel and AISI 304 stainless steel are lap-welded by a pulsed-NdYAG laser. The weld joint is of good surface quality based on the shear strength which reaches its work requirement. The effects of the laser welding process parameters such as laser current, welding speed and defocused distance on the shape of the weld seam are investigated. The optimum welding parameters are I=350 A, V=100 mm/min, ΔF=-1 mm,f=4 Hz, W=10 ms, and there is no weld trace on the back of AISI 304 stainless steel at the same time. The microstructure of the welded seam is martensite and residual austenite, and close to the side of galvanized sheet, there is a small amount of pearlite. Because of the existence of martensitic hardened layer, the microhardenss in the weld seam and heat affected zone is higher than that of the base metal.