镀铝高强硼钢与铝合金激光熔钎焊接方法研究  

Study on Laser Welding-brazing Method of Aluminum Alloy to Al-coated High Strength 22MnB5 Steel

作　　者：衣玉兰[1] 陈建萍[2] 

机构地区：[1]新疆交通职业技术学院汽车工程学院,新疆乌鲁木齐831401 [2]新疆交通职业技术学院机电工程学院,新疆乌鲁木齐831401

出　　处：《热加工工艺》2016年第15期49-51,55,共4页Hot Working Technology

摘　　要：为了研究AA6016铝合金/22MnB5硼钢激光熔钎焊的可行性,采用金相显微镜、扫描电镜、拉伸-剪切试验和XRD分析,对焊接接头显微组织、力学性能以及拉剪断口进行了分析。结果表明,对镀铝硼钢和铝合金直接焊接难以得到可靠的接头;通过对镀铝硼钢进行喷砂处理,去除表面具有裂纹的高铝化合物层可以有效提高焊接质量。在焊料/钢界面生成了Al_(13)Fe_4和Al_(18)Fe_2Si金属间化合物。接头最大拉剪载荷达到3390 N,接近铝合金母材强度。To research the feasibility of laser welding-brazing between high-strength Al-coated 22MnB5 steel and AA6016 Al alloy, microstructure, mechanical properties and tensile-shear fracture of the welded joint were investigated by using optic microscopy, scanning electron microscopy, tensile-shear test and XRD analysis. Results show that it is infeasible to directly weld Al alloy to Al-coated 22MnB5. By sandblasting, the crack in Al-rich intermetallic layer is eliminated, which can effectively improve the bonding strength. Al13Fe4 and Al18 Fe2Si phases are generated at the filler/steel interface. The maximum tensile-shear loading is 3390N, which can approach the strength of base Al alloy.

关 键 词：镀铝硼钢 铝合金 激光熔钎焊 拉伸强度 

分 类 号：TG456.7[金属学及工艺—焊接]