Two dissimilar materials, aluminum alloy and aluminum-coated steel, were joined by cold metal transfer process using AlSi5 filler wire. To this end, the steel was coated with Al-Si. The steel did not melt and aluminum...Two dissimilar materials, aluminum alloy and aluminum-coated steel, were joined by cold metal transfer process using AlSi5 filler wire. To this end, the steel was coated with Al-Si. The steel did not melt and aluminum was melt to form the joint during the process, it was actually cold metal transfer welding-brazing. The macrostructure, microstructure, alloy element distribution, and inter-metallic compounds were analyzed by optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy. It was found that the Al-Si coating dissolved into the weld metal. The pre-existing thin Fe-Al- Si ternary inter-metallic compounds in the interface between the Ak-Si coating layer and base metal steel also partially dissolved into the weld zone, tending to reduce the thickness of inter-metallic compounds. Approximate 3 μm thick undissolved intermetallic compound was found at the interface after welding which could guarantee sound bonding strength in dissimilar materials joining. The sample was fractured at the fusion zone near the aluminum side in the tensile test. The ultimate tensile strength was about 156 MPa, and the fracture mode is ductile failure in nature according to its morphology.展开更多
采用冷金属过渡(CMT)技术,以4043 Al Si5焊丝为填充材料,分别在Q235钢板和镀锌钢板上进行点焊。使用扫描电镜、能谱分析研究了焊接接头的显微组织,并从热力学角度分析了界面结构形成机理。结果表明:无论基板采用镀锌钢还是Q235钢,在界...采用冷金属过渡(CMT)技术,以4043 Al Si5焊丝为填充材料,分别在Q235钢板和镀锌钢板上进行点焊。使用扫描电镜、能谱分析研究了焊接接头的显微组织,并从热力学角度分析了界面结构形成机理。结果表明:无论基板采用镀锌钢还是Q235钢,在界面处均会观察到富Si层,其形成符合热力学条件;铝-Q235钢、铝-镀锌钢在较大热输入的情况下两者都可以达到较好的润湿性;其中镀锌钢板中的镀锌层不能起到改善铝-钢润湿性的作用,其主要作用在于蒸发带走热量而相对降低界面上的热输入。展开更多
基金This research is supported by the National Natural Science Foundation of China （ No. 51005101 ）, Jiamusi University Scientific Research Project （12010 -118） and State Key Laboratory of Advanced Welding Production Technology Project （AWJ-M13 -04）.
文摘Two dissimilar materials, aluminum alloy and aluminum-coated steel, were joined by cold metal transfer process using AlSi5 filler wire. To this end, the steel was coated with Al-Si. The steel did not melt and aluminum was melt to form the joint during the process, it was actually cold metal transfer welding-brazing. The macrostructure, microstructure, alloy element distribution, and inter-metallic compounds were analyzed by optical microscopy, scanning electron microscopy, and energy dispersive spectroscopy. It was found that the Al-Si coating dissolved into the weld metal. The pre-existing thin Fe-Al- Si ternary inter-metallic compounds in the interface between the Ak-Si coating layer and base metal steel also partially dissolved into the weld zone, tending to reduce the thickness of inter-metallic compounds. Approximate 3 μm thick undissolved intermetallic compound was found at the interface after welding which could guarantee sound bonding strength in dissimilar materials joining. The sample was fractured at the fusion zone near the aluminum side in the tensile test. The ultimate tensile strength was about 156 MPa, and the fracture mode is ductile failure in nature according to its morphology.
文摘采用冷金属过渡(CMT)技术,以4043 Al Si5焊丝为填充材料,分别在Q235钢板和镀锌钢板上进行点焊。使用扫描电镜、能谱分析研究了焊接接头的显微组织,并从热力学角度分析了界面结构形成机理。结果表明:无论基板采用镀锌钢还是Q235钢,在界面处均会观察到富Si层,其形成符合热力学条件;铝-Q235钢、铝-镀锌钢在较大热输入的情况下两者都可以达到较好的润湿性;其中镀锌钢板中的镀锌层不能起到改善铝-钢润湿性的作用,其主要作用在于蒸发带走热量而相对降低界面上的热输入。
