将磁场引入激光焊接系统中, 开展了DC51D+AZ镀锌钢和6061铝合金的激光对接焊试验和焊接试样的拉伸试验, 研究了交变磁场对焊缝成形、气孔缺陷、断口形貌、金属间化合物与焊缝力学性能的影响。结果表明, 添加磁场后,焊缝抗拉强度得到提高; 磁场搅拌能改善焊缝的形貌, 减少焊缝中气孔的数量, 细化针状FeAl3相, 抑制脆性Fe/Al化合物的生长, 从而有效提高焊缝的力学性能。

A magnetic field is introduced into the laser welding process, and the butt welding experiment of DC51D+AZ galvanized steels and 6061 aluminum alloys and the tensile experiment of welding samples are conducted. The influences of the alternating magnetic field on weld formation, porosity defects, fracture morphologies, intermetallic compounds, and mechanical properties of Fe/Al welding joints are investigated. The results show that the tensile strength of welding joints is improved after the introduction of the magnetic field. The magnetic stirring can improve the welding morphology, reduce the number of pores in welding joints, refine the acicular FeAl3 phase, and inhibit the growth of brittle Fe/Al compounds, which thus improves the mechanical properties of welding joints.