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采用宽带激光光斑和填粉焊接技术,在不使用钎剂的情况下进行6061铝合金/镀锌钢板的熔钎焊接实验。分析测试了接头成形、焊缝组织和接头强度,并探讨了影响接头强度的因素。结果表明,采用此方法可实现6061铝合金/镀锌钢板的熔钎焊连接。选用优化的焊接工艺参数获得了成形饱满,无裂纹、气孔等缺陷的焊缝。焊缝熔宽和金属间化合物层厚度随焊接热输入量的增加而增大。熔钎焊缝中金属间化合物由Al-Fe和Al-Fe-Si系统化合物组成。拉伸试样均断裂在钎料/镀锌钢界面,接头最大机械抗力为152.5N/mm,断口呈脆性断裂特征,钎料/镀锌钢界面为接头的薄弱环节。拉伸试样铝一侧断裂面由Al5Fe2Zn0.4和α-Al组成。焊缝熔宽、金属间化合物层厚度共同决定了接头的机械抗力水平。
Using a wide band of laser spot and filler welding technology, without the use of flux 6061 aluminum alloy / galvanized steel brazing experiments. The joint forming, weld microstructure and joint strength were analyzed and analyzed, and the factors influencing joint strength were discussed. The results show that this method can be used to achieve 6061 aluminum alloy / galvanized steel melting brazing connection. Optimized welding process parameters obtained full shape, no cracks, porosity and other defects of the weld. Weld width and intermetallic compound thickness increase with the increase of welding heat input. Intermetallic compounds in the brazing filler metal consist of Al-Fe and Al-Fe-Si system compounds. Tensile specimens were all broken at the solder / galvanized steel interface. The maximum mechanical resistance of the joints was 152.5N / mm, the fracture was brittle fracture, and the brazing / galvanized steel interface was the weakest link. Tensile specimen aluminum fracture surface by the Al5Fe2Zn0.4 and α-Al composition. Weld weld width, intermetallic compound layer thickness together determine the level of mechanical resistance joints.