【摘要】 以无Cs型和含Cs型AlSi12药芯焊丝为填充金属，进行6061铝合金和Q235钢激光熔钎焊试验研究，用光学显微镜、扫描电子显微镜对熔钎焊接头的宏观形貌、微观组织进行分析，探讨药芯焊丝中Cs元素对AlSi12焊丝在钢表面的润湿铺展性能、接头微观组织及拉伸性能的影响。研究结果表明，药芯焊丝中加Cs元素，大大提高了熔融的焊丝在母材背面的润湿铺展性能，从而获得饱满美观的铝合金/钢激光熔钎焊接头形貌。Cs元素通过冶金反应过渡进入铝合金/钢焊接接头中，一定程度上阻碍了Al,Fe之间的反应，降低了接头界面反应层的金属间化合物层（IMCs）厚度，但是略微降低了接头的抗拉强度。更多还原

【Abstract】 Laser welding-brazing tests of 6061 aluminum alloy and Q235 steel were carried out by AlSi12 flux-cored welding wire without Cs and with Cs as filler metal. Macrostructure and microstructure of welded-brazed joints were analyzed by optical microscope and scanning electron microscope. Influence of Cs element on wetting and spreading ability of flux-cored welding wire on the steel surface, microstructure and tensile properties of welded-brazed joints was discussed. The research results showed that adding Cs element into flux-cored welding wire improved wetting and spreading ability of molten welding wire on the back of base metal, resulting in a full and beautiful appearance of Al alloy/steel laser welded-brazed joints. Cs elements transferred into Al alloy/steel welded-brazed joints through metallurgical reaction, and it hindered reaction between Al and Fe, so that thickness of intermetallic compound layer(IMCs) was decreased at the interface of welded-brazed joints. Moreover, tensile strength of welded-brazed joints was reduced.更多还原