铝合金薄板激光拼焊工艺及其杯突成形性能

李云涛; 张文俊; 杨立军; 张建

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铝合金薄板激光拼焊工艺及其杯突成形性能
李云涛^1,2, 张文俊¹, 杨立军³, 张建^1,2
1.天津理工大学材料科学与工程学院, 天津 300384;2.天津理工大学天津市光电显示材料与器件重点实验室, 天津 300384;3.天津大学材料科学与工程学院, 天津 300072

摘要:

主要研究6061铝合金激光拼焊板的工艺及成形性能,分析拼焊板在杯突试验中的成形特点以及焊缝对拼焊板的整体塑性成形的影响.杯突成形性能试验结果显示了宏观开裂发生在稍偏移焊缝中心的狭窄热影响区内;拼焊板试验杯突值低于母材杯突值;基于DYNAFORM软件数值模拟,忽略焊缝类型,仅考虑焊缝在板材上的位置.结果表明,拼焊板杯突模拟开裂容易发生在杯突顶端下沿的焊缝处,模拟结果与实际试验结果略有差异,这可能与焊缝设置有一定关系.

关键词: 6061铝合金薄板激光拼焊杯突成形 DYNAFORM模拟

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Laser tailor welding of aluminum alloy sheet and cup axon formability of TWB

LI Yuntao^1,2, ZHANG Wenjun¹, YANG Lijun³, ZHANG Jian^1,2

1.School of Materials Science Engineering, Tianjin University of Technology, Tianjin 300384, China;2.Tianjin Key Laboratory for Photoelectric Materials Devices, Tianjin 300384, China;3.School of Materials Science Engineering, Tianjin University, Tianjin 300072, China

Abstract:

The process and forming performance of laser tailor-welded board(TWB) of 6061 aluminum alloy were studied.The forming characteristics of TWB in the cup axon trials and the influence of welded beam on overall plastic forming of tailor-welded plate were analyzed.The cupping test results of laser TWB shows that the cracking generally appears in the narrow HAZ.The cupping index of TWB was slightly lower than that of base metal.During the numerical simulation process of cupping test with DYNAFORM software,only the location of the welded beam was considered but its type was ignored,and the results showed that the simulation cracking of the TWB easily occurred at the welded seam below the cupping head with the influence of the welded seam,and the simulation results were slightly different from the practical tests,which was possibly related to the set of the welded seam.

Key words: 6061 aluminum alloy sheet laser tailor-welded cup axon formability DYNAFORM simulation