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采用脉冲式Nd…YAG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。
Pulse Nd: YAG laser is used as welding heat source to non-through laser welding of galvanized steel sheet and AISI 304 stainless steel plate. By controlling the welding process, the welded joints meet the requirements of strength without any trace on the bottom to ensure the stainless steel The appearance of the board quality. The process parameters were optimized by studying the influence of current, welding speed and defocusing amount on weld penetration, weld width and strength. The optimum welding parameters were I = 350 A, V = 100 mm / min, ΔF = -1 mm, f = 4 Hz, W = 10 ms, the shear strength at this time to meet the requirements of use, stainless steel surface without welding traces; weld thin and dense, lath martensite and residual Austrian There is also a certain amount of pearlite structure near the body of the galvanized steel. Due to the presence of the martensite hardening layer, the microhardness of the weld zone and the heat affected zone is higher than that of the base metal.