Investigation on the effects of parameters on hot cracking and tensile shear strength of overlap joint in laser welding dissimilar Al alloys
Investigation on the effects of parameters on hot cracking and tensile shear strength of overlap joint in laser welding dissimilar Al alloys
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DOI：
10.1007/s00170-016-8383-0
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Yulong Zhang;F. Lu;H. Cui;Yan Cai;Song-tao Guo;Xinhua Tang
中科院分区：
文献类型：
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作者：
Yulong Zhang;F. Lu;H. Cui;Yan Cai;Song-tao Guo;Xinhua Tang
随着汽车工业对轻量化要求的不断提高，在重叠接头内加入异种铝合金已成为必然。然而，热裂是铝合金焊接中的一个难题。无热裂且具有良好抗拉剪切强度的重叠接头对工业应用具有重要意义。为了更好地了解异种铝合金激光焊接过程中的热裂行为，采用AA5754与AA6013板材进行叠焊，研究工艺参数对热裂敏感性的影响，然后对焊接接头进行拉伸剪切试验。对焊接接头的化学成分、显微组织和熔合率进行了研究。结果表明，合理选择焊接工艺参数可以防止热裂的发生。特别确定了防止热裂形成的关键工艺参数，即焊接速度3.0、3.3、3.9和4.5 m/min，相应的重叠宽度为12、10、8和6 mm。无热裂焊接接头的抗拉剪切强度达到140 N/mm，满足工业应用要求。
With the increasing requirement for weight reduction in automotive industry, joining dissimilar aluminum (Al) alloys within overlap joint becomes more and more inevitable. However, hot cracking is a challenge issue in Al alloy welding. Overlap joint without hot cracking and also with good tensile shear strength is very important for industrial application. In order to better understand the hot cracking behavior in laser welding of dissimilar Al alloys, AA5754 and AA6013 sheets were overlap welded to investigate the effects of process parameters on hot cracking susceptibility, then the tensile shear tests were carried out on sound welded joint. The chemical composition, microstructure, and fusion ratio of welded joint were also studied. The results showed that the hot cracking can be prevented under appropriately choosing of welding process parameters. In particular, the critical process parameters to prevent the formation of hot cracking, i.e., welding speed 3.0, 3.3, 3.9, and 4.5 m/min with the corresponding overlap width 12, 10, 8, and 6 mm, were determined in the present study. The tensile shear strength of the sound welded joints without hot cracking reached 140 N/mm, which was qualified to meet the industrial application requirement.