提出了一种试验设计方法来优化 SUS301L奥氏体不锈钢非穿透型激光搭接焊接工艺参数。在保证焊接接头的力学性能的前提下, 通过对焊接过程中工艺参数的优化来减少焊缝背面变形。为了获得最佳的工艺参数, 试验制定了一套与每个焊缝特征相关的焊接参数的数学模型, 并以熔深的最小化和熔宽的最大化, 以及背面变形和剪切强度作为目标进行了优化。研究采用了部分正交试验法来降低试验误差和减少试验样本数。试验所用激光器为 CO2激光器, 试验优化得到的最佳工艺参数为: 激光功率 P越2.2 kW、焊接速度 v越4.5 m/min、激光入射角兹越45毅、离焦量驻f越+2 mm、保护气体 fg越25 L/min(He: Ar=2:3)。

This paper presents an experimental design approach to process parameter optimization for the laser lap welding ofSUS301L austenitic stainless steels using CO2 laser in order to reduce the distortion of the back of the welding seams while ensuring mechanical properties of welding joints. To determine the optimal laser -welding parameters, a set of mathematical models weredeveloped relating welding parameters to each of the weld characteristics. In order to reduce experimental error and the number ofspecimens, the part of orthogonal experiments were used in this study. The quality criteria set for the weld to determine optimalparameters were the maximization of weld width and the minimization of weld depth. Laser power, welding speed, the laser irradiationangle, the focused distance and shield gas of 2.2 kW, 4.5 m/min, 45毅, +2 mm, He with the flow of 10L/min and Ar with the flow of15 L/min, respectively, were identified as the optimal set of process parameters.