基于Design-Expert V7设计的不锈钢激光非熔透搭接焊工艺优化研究  

Technology Optimizing Research on Laser Nonpenetration Lap Welding of Stainless Steel Based on Design-Expert V7

作　　者：刘佳[1] 张宏[1] 石岩[1] 

机构地区：[1]长春理工大学机电学院,长春130022

出　　处：《机械工程学报》2011年第16期52-60,共9页Journal of Mechanical Engineering

基　　金：教育部留学回国人员基金(20080003);吉林省科技发展计划(20106014);长春市科技计划(10KZ06)资助项目

摘　　要：在保证焊接接头的力学性能的前提下,采用Design-Expert V7软件对厚度为0.8 mm/1.5 mm的SUS301L奥氏体不锈钢激光搭接焊接试验进行设计,并通过优化焊接参数来减少焊缝背面微凸变形。为了获得最佳的激光焊接工艺参数,建立一套与每个焊缝特征相关的焊接参数的数学模型。并通过验证试验检验所建立的数学模型的准确性,其误差范围小于5%,可以被用于后续的优化分析。根据优化方案得到最佳的焊接条件是激光功率、焊接速度、激光入射角度和离焦量分别为3.50～3.79 kW、7.40～8.00 m/min、65°和0 mm。同时,通过试验研究和优化分析得出,离焦量只对最优区域的偏移有影响,对最优区域的宽度影响不大,而激光入射角度对最优区域的偏移和宽度均有较大影响。An experimental design approach to technical parameter optimizing for the laser lap welding of 0.8 mm/1.5 mm SUS301L austenitic stainless steels is studied by using YAG laser in order to reduce the welding distortions 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 of welding parameters related to each of the weld characteristics are built.The accuracy of the models are inspected by validation tests,and the error range is smaller than 5%,so they can be used for subsequent optimization analysis.Based on the optimization scheme,the laser power,welding speed,laser incident angle and defocusing distance in the range of 3.50～3.79 kW,7.40～8.00 m/min,65° and 0 mm respectively,are identified as the optimal set of process parameters.By experimental study and optimization analysis,it is obtained that the focusing distance has influence only on the deviation of optimal region,and has little effect on the width of optimal region,while the laser incident angle has great effect on both deviation and width of optimal region.

关 键 词：激光焊接 奥氏体不锈钢 试验设计 微凸变形 抗拉强度 

分 类 号：TG456[金属学及工艺—焊接]