研究了316L不锈钢和6061铝合金的YAG激光焊接工艺, 优化了激光焊接工艺参数(焊接电流、激光脉宽、激光频率、焊接速度), 分析了接头抗拉剪强度及焊缝区显微硬度。结果表明, 激光焊接优化工艺参数为焊接电流100 A, 激光脉宽4.5 ms, 激光频率12 Hz, 焊接速度0.17 m/min; 优化后接头最大抗拉剪强度为98.86 MPa; 焊缝熔池区显微硬度介于铝合金与不锈钢硬度之间, 显微硬度随着偏离焊缝中心的距离增加(从焊缝中心到熔合线)逐渐降低。

The process of YAG laser welding for 316L stainless steel and 6061 aluminum alloy was investigated, the associated process parameters of laser welding (welding current, laser pulse width, laser frequency and welding speed) were optimized, and the tensile shear strength and microhardness within the weld zone of the 316L/6061 dissimilar matels joint was analyzed. The results show that: the optimized welding current was 100 A, laser pulse width was 4.5 ms, laser frequency was 12 Hz and welding speed was 0.17 m/min; the corresponding joint tensile shear strength was 98.86 MPa; the microhardness of weld pool was between that of the aluminum alloy and stainless steel, and microhardness reduced with diverging from the weld center (from the weld center to the fusion line).