Effect of welding curr ent on microstructure and properties of 304 stainless steel Laser-MIG hybrid welding

304不锈钢激光-MIG复合焊焊接电流对接头组织性能的影响 Effect of welding curr ent on microstructure and properties of 304 stainless steel Laser-MIG hybrid welding 宋世达 SONG Shida 1 first-author 杨子威 YANG Ziwei 1 钱美霞 QIAN Meixia 1 王克鸿 WANG kehong 1 南京理工大学材料科学与工程学院 南京理工大学材料科学与工程学院 School of Materials Science and Engineering,Nanjing University of Science and Technology School of Materials Science and Engineering,Nanjing University of Science and Technology 采用激光-MIG复合焊对厚度6 mm的SUS304不锈钢进行拼接焊,比较不同焊接电流对接头显微组织及其性能的影响。EBSD分析显示焊缝择优取向为<001>方向,焊接电流为220 A的接头织构取向强度大于焊接电流为180 A的。力学性能检测表明接头硬度变化范围为170～195 HV。焊接电流为180 A时接头的强度和塑性大于焊接电流为220 A时的接头且低于母材。 Using Laser-MIG hybrid welding,the effect of welding current of 180 A and 220 A on the microstructure and properties of 6 mm SUS304 stainless steel was compared. EBSD analysis showed that the preferred orientation of the weld was <001 > direction,and the texture orientation intensity of the joint with welding current of 220 A was greater than that of the welding current of 180 A. The test of mechanical properties shows that the hardness of the joint varies from 170 HV to 195 HV. The strength and plasticity of the joint with welding current of 180 A are higher than that of the joint with welding current of220 A and lower than that of the base metal. SUS304不锈钢 激光-MIG复合焊 金相组织 力学性能 SUS304 stainless steel Laser-MIG composite welding metallographic structure mechanical properties TG457.11 2022-03-08 7 50