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以5052铝合金和预置镀层的ST07Z钢板为研究对象,采用Nd:YAG激光器进行激光填粉熔-钎焊试验,利用光学显微镜、扫描电镜和拉伸试验机等对熔-钎焊接头的微观组织和力学性能进行研究。结果表明:镀层能够有效抑制铝铁间的扩散反应,铝/镀镍钢、铝/镀铜钢及铝/镀锌钢三种接头界面结合区的组织主要为Al-Fe金属间化合物及一定数量的镀层元素与铝形成的二元化合物。另外,三种不同镀层的钎焊接头中铝/镀锌钢抗拉剪强度最大,达到140.7N/mm。
Taking 5052 aluminum alloy and pre-coated ST07Z steel as the research object, laser melting-brazing welding with Nd: YAG laser was carried out. The microstructure of the melt-brazed joint was observed by optical microscope, scanning electron microscope and tensile tester Tissue and mechanical properties of the study. The results show that the coating can effectively inhibit the diffusion reaction between aluminum and iron. The microstructure of the bonding interface of the aluminum / nickel-plated steel, aluminum / copper-plated steel and aluminum / galvanized steel joints are mainly Al-Fe intermetallic compounds and a certain amount Of a binary compound of a plating element and aluminum. In addition, the aluminum / galvanized steel in the brazed joints of the three different coatings has the highest tensile strength of 140.7 N / mm.