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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。
In order to study the feasibility of laser fusion brazing of AA6016 aluminum alloy / 22MnB5 boron steel, the microstructure, mechanical properties and tensile shear fracture of welded joints were studied by using optical microscope, scanning electron microscope, tensile-shear test and XRD analysis analysis. The results show that it is difficult to obtain a reliable joint for the direct welding of aluminized aluminized boron steel and aluminum alloy. By blasting aluminized boron steel, removing the cracked high aluminum compound layer on the surface can effectively improve the welding quality. Al_ (13) Fe_4 and Al_ (18) Fe_2Si intermetallic compounds were formed on the solder / steel interface. Joint maximum tensile shear load reached 3390 N, close to the strength of aluminum alloy base metal.