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崔佃忠, 芦笙, 崔晴晴, 刘彬. 焊接热输入对铝/镀锌钢CMT熔-钎焊接头组织与性能的影响[J]. 焊接学报, 2014, 35(9): 82-86.
引用本文: 崔佃忠, 芦笙, 崔晴晴, 刘彬. 焊接热输入对铝/镀锌钢CMT熔-钎焊接头组织与性能的影响[J]. 焊接学报, 2014, 35(9): 82-86.
CUI Dianzhong, LU Sheng, CUI Qingqing, LIU Bin. Effect of heat input on microstructure and mechanical properties of CMT welding-brazing joint between 5052 aluminum alloy and galvanized Q235 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(9): 82-86.
Citation: CUI Dianzhong, LU Sheng, CUI Qingqing, LIU Bin. Effect of heat input on microstructure and mechanical properties of CMT welding-brazing joint between 5052 aluminum alloy and galvanized Q235 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(9): 82-86.

焊接热输入对铝/镀锌钢CMT熔-钎焊接头组织与性能的影响

Effect of heat input on microstructure and mechanical properties of CMT welding-brazing joint between 5052 aluminum alloy and galvanized Q235 steel

  • 摘要: 采用ER4043焊丝对5052铝/Q235镀锌钢进行CMT熔-钎焊,研究焊接热输入对接头组织及性能的影响.结果表明,焊缝熔宽、热影响区粗化程度、界面层硬度及厚度均随热输入的增加而增大,过热组织粗化导致拉伸试样在铝母材热影响区断裂.熔焊区组织主要为垂直于基底向焊缝中心生长的α-Al树枝晶及Al-Si共晶组织,钎焊区界面层厚度在2.55~6.86μm之间,铝侧界面主要为FeAl3金属间化合物,呈凹凸不平锯齿状;钢侧界面平滑,主要为Fe2Al5(热输入较低时)或FeAl2,FeAl(热输入较高时).

     

    Abstract: CMT welding was carried out to weld-braze lap joint of 5052 aluminum alloy to galvanized Q235 steel using ER4043 filler wire. The effect of heat input on the microstructure and mechanical properties of the joint was investigated. The results show that the weld width, grain size of heat-affected zone(HAZ), hardness and thickness of interfacial layer increased with the increasing of heat input. The lap joints broke initially in the HAZ of aluminum alloy in tensile test due to grain coarsening. The weld zone mainly consisted of dendritic α-Al matrix and intergranular Al-Si eutectic, both of which grew to the weld center perpendicular to interfacial reaction layer and fusion line.The thickness of interfacial reaction layer in the brazed zone was around 2.55-6.86 μm. The interfacial reaction layer on aluminum side was uneven and consisted of FeAl3 intermetallic compound(IMC), while that on steel side was uneven and mainly composed of Fe2Al5(with lower heat input) or FeAl2 and FeAl(with higher heat input).

     

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