文献类型：期刊文献

英文题名：Characteristics of multi-pass narrow-gap laser welding of D406A ultra-high strength steel

作者：Ning, Jie[1];Zhang, Lin-Jie[1];Yang, Jian-nan[1];Yin, Xian-Qing[1];Wang, Xue-Wu[2];Wu, Jun[3]

机构：[1]Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China;[2]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China;[3]Xian Aerosp Power Machine Factory Co Ltd, Xian 710025, Shaanxi, Peoples R China

年份：2019

卷号：270

起止页码：168

外文期刊名：JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

收录：;EI(收录号：20191006599918);WOS:【SCI-EXPANDED(收录号:WOS:000468712800016)】；

基金：This work was supported by the Natural Science Foundation of Shaanxi Province (Grant no. 2017JM5069), National Natural Science Foundation of China (Grant Nos. 51775416 and 61773165) and National Thousand Talents Program of China (Grant No. WQ2017610446).

语种：英文

外文关键词：Narrow-gap laser beam welding; Ultra-high strength steel; Filler wire; Welding distortionn; Microstructure

摘要：A universal and applicable method to predict bonding quality in narrow-gap laser beam filler wire welding of D406A ultra-high strength steel was presented. Defect-free joint could be achieved under the predicted optimal welding condition, while the production efficiency of narrow-gap laser beam filler wire welding under optimized welding condition was about 3.75 times that of traditional tungsten arc welding currently used in practical industry. Compared with the tungsten arc welding joint, microstructure in the fusion zone of laser welded joint was more uniform, which brought out a less fluctuation in the microhardness of fusion zone along the thickness direction. The tensile strength of as-welded laser welding joint was slightly higher than that of as-welded tungsten arc welding joint while the elongation of the former increased by 15.9% over that of the latter. A binocular stereo three-dimensional scanning method was adopted to compare the residual distortion of D406A joints between laser welding and tungsten arc welding. Notably, the distortion of laser welded joint was about 21% of that of the tungsten arc welding joint. Narrow-gap laser filler wire welding is a feasible substitute for conventional tungsten arc welding in the fabrication of welded construction of D406A steel.