Butt joining of 5052 aluminum alloy and Q235 low carbon steel was achieved using laser beam welding with Sn-30Zn filler wire. The weld formation, microstructures, and mechanical property were investigated with varied laser power. The results show that joining of 5052 Al/Q235 steel dissimilar metals in a butt configuration by laser beam welding with Sn-30Zn filler wire is feasible. The solid solution interface formed at the aluminum side and the reaction layer formed at the steel side. With increasing laser power, the joining mode transformed from brazing to welding-brazing due to the melt of aluminum alloy. The thickness of the interfacial intermetallic compounds (IMCs) layer was also increased with laser power. However, when the laser power was 1200 W, the thickness of the interfacial IMCs layer sharply decreased due to the detachment of the IMCs layer. The fracture of the joint occurred at the steel interface and partially through the weld seam on the top surface. The fracture surface was characterized by both brittle and ductile fracture. When the joints were obtained at the laser power of 800 W and 1200 W, the tensile strength reached 79 MPa and 78 MPa, respectively. Furthermore, the formation mechanism of microstructures and its influence on mechanical property was discussed.

通过使用Sn-30Zn填充焊丝进行激光束焊接，实现了5052铝合金和Q235低碳钢的对接。用不同的激光功率研究了焊缝的形成，显微组织和力学性能。结果表明，采用Sn-30Zn填充焊丝通过激光束焊接将5052 Al / Q235钢异种金属对接连接是可行的。固溶体界面形成在铝侧，反应层形成在钢侧。随着激光功率的增加，由于铝合金的熔化，接合方式从钎焊转变为焊接钎焊。界面金属间化合物（IMC）层的厚度也随着激光功率的增加而增加。但是，当激光功率为1200 W时，由于IMC层的分离，界面IMC层的厚度急剧减小。接头的断裂发生在钢界面处，并且部分地通过顶面上的焊缝发生。断裂表面的特征是脆​​性和韧性断裂。当在800 W和1200 W的激光功率下获得接头时，抗拉强度分别达到79 MPa和78 MPa。此外，讨论了微观结构的形成机理及其对力学性能的影响。分别。此外，讨论了微观结构的形成机理及其对力学性能的影响。分别。此外，讨论了微观结构的形成机理及其对力学性能的影响。