基于响应面法的低碳贝氏体钢激光-电弧复合焊接工艺参数优化  

Process Parameter Optimization for Laser-Arc Hybrid Welding of Low-Carbon Bainite Steel Based on Response Surface Methodology

作　　者：余杰 蔡创 谢佳 梁盈 黄嘉森 刘致杰 刘永洪 Yu Jie;Cai Chuang;Xie Jia;Liang Ying;Huang Jiasen;Liu Zhijie;Liu Yonghong(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Science and Engineering,Southwest Jiaotong University,,Chengdu 610031,Sichuan,China)

机构地区：[1]西南交通大学材料科学与工程学院材料先进技术教育部重点实验室,四川成都610031

出　　处：《中国激光》2022年第16期164-173,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(51805456);四川省科技计划项目(2021YFG0209);中央高校基本科研业务费专项资金(2682021CX108)。

摘　　要：选用6 mm厚低碳贝氏体钢板进行激光-MAG复合焊接(MAG焊,熔化极活性气体保护电弧焊),以激光功率、焊接速度、送丝速度为试验参数,以焊缝成形系数(ψ)、激光区面积比(R)为响应指标,建立响应面分析数学模型。送丝速度对ψ和R的影响显著,激光功率与焊接速度的交互作用对ψ的影响显著,送丝速度与焊接速度的交互作用对R的影响显著。对焊缝成形进行评定,筛选出最优工艺参数:激光功率4120~4300 W,焊接速度15.3~16.3 mm/s,送丝速度12.3~13.6 m/min。经试验验证,ψ和R的模型准确度分别为95.0%和92.3%。Objective Low-carbon bainite steel has the advantages including high toughness and high specific strength,and has become the main material for the manufacture of high-speed train bogies which have increasingly stringent requirements for light-weighting.There are many butt joints and T-joints in bogies,which urgently need the high efficiency and quality welding technologies.Compared with MAG welding(MAG welding,metal active gas are welding),the laser-arc hybrid welding with the combination of laser with arc improves the welding efficiency and reduces the welding defects.The laserarc hybrid welding has a greater prospect of application in the welding of low-carbon bainite steel for high-speed train bogies.However,the parameter optimization for laser-are hybrid welding is costly and time-consuming.The changes in the welding parameters and the interaction among the welding parameters cause the change in the weld formation.The response surface methodology(RSM)is used to study the influence of various parameters and the interaction among parameters on the response indexes,which is beneficial to achieve the parameter optimization for the laser-are hybrid welding process.However,most studies have focused on the application of the response surface optimization analysis in the optimization of the single heat source welding process.Few studies have focused on the response surface optimization analysis for the hybrid heat sources.Here,the influence of various parameters and the interaction among parameters on the welding morphology is studied for laser-MAG hybrid welding of 6 mm thick low-carbon bainite steel butt joints based on the response surface methodology.The welding process parameters are optimized and tested.It is verified that the process optimization for laserMAG hybrid welding of new low-carbon bainite steel is realized.Methods A new type of low-carbon bainite steel plate with a size of 350 mm×175 mm×6 mm is used as the base metal,and the welding wire with a diameter of 1.2 mm is adopted as the filler wire.The

关 键 词：激光技术 激光-MAG复合焊接 低碳贝氏体钢 响应面法 成形系数 激光区面积比 

分 类 号：TG457.1[金属学及工艺—焊接]