Characteristics of multi-pass narrow-gap laser welding of D406A ultra-high strength steel
作者： Jie Ning , Lin-Jie Zhang , Jian-nan Yang , Xian-Qing Yin , Xue-Wu Wang
DOI: 10.1016/J.JMATPROTEC.2019.02.026
关键词: Arc welding 、 Tungsten 、 Laser beam welding 、 Ultimate tensile strength 、 Joint (geology) 、 Welding 、 Composite material 、 Materials science 、 Fabrication 、 Laser
摘要: Abstract 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 condition, while production efficiency optimized condition about 3.75 times that traditional tungsten arc currently used practical industry. Compared with joint, microstructure fusion zone welded more uniform, which brought out a less fluctuation microhardness along thickness direction. The tensile as-welded slightly higher than elongation former increased by 15.9% over latter. binocular stereo three-dimensional scanning adopted compare residual distortion joints between welding. Notably, 21% joint. Narrow-gap is feasible substitute for conventional fabrication construction steel.
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