Structure and properties of KTIG-MIG coupling welding butt joint  

作　　者：Qian Zhang Hongchang Zhang Yinan Li Wenhu He Minghao Chen Xuewen Guo 

机构地区：[1]Qingdao University of Technology,Qingdao 266520,China [2]Shandong Weierham Marine Equipment Technology Co.,Ltd.,Weihai 264400,China

出　　处：《China Welding》2025年第1期67-73,共7页中国焊接(英文版)

基　　金：supported by the National Natural Science Foundation of China(51605103);Key Projects of Science and Technology Research Plan of Hubei Provincial Department of Education(D20221306);Key Project of Hubei Provincial Science and Technology Department(2020BAB055).

摘　　要：To investigate the potential of KTIG-MIG coupling welding in improving welding efficiency and quality for medium-thickness Q235B low-carbon steel plates,this study specifically analyzes the microstructural characteristics of three distinct regions in butt joints-the base metal(BM),heat-affected zone(HAZ),and weld metal zone(WMZ)-while simultaneously conducting comprehensive mechanical property testing on the welded joints.The test results of mechanical properties are combined with the data of microstructure analysis.The relationship between mechanical properties and microstructure of the WMZ of the butt joint is found.The results show that the microstructure of weld zone does not change significantly with the increase of heat input,but the grain structure of fusion zone and heat affected zone increases gradually.The tensile properties of welded joints are better than those of base materials under different heat input conditions.

关 键 词：KTIG-MIG composite welding Heat input Microstructure Mechanical property 

分 类 号：TG457.1[金属学及工艺—焊接]