| 纵向预拉伸增大铝合金焊接热裂纹倾向的分析 |
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| 引用本文： | 周广涛,刘雪松,杨建国,方洪渊.纵向预拉伸增大铝合金焊接热裂纹倾向的分析[J].焊接学报,2009,30(1):105-108. |
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| 作者姓名： | 周广涛 刘雪松 杨建国 方洪渊 |
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| 作者单位： | 1. 哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨,150001
2. 哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨,150001;沈阳航空工业学院航天技术研究所,沈阳,110034 |
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| 摘 要： | 利用热弹塑性有限元方法对铝合金薄板壁TIG焊接进行了数值模拟计算,建立了分析模型,定量地描述了预拉伸载荷对熔池后方凝固金属产生的横向拉伸应力和应变在焊缝中心的分布情况,并进行了试验验证.分析得出,预拉伸载荷对于焊接刚形成的凝固连接处产生横向拉伸应力,该横向应力的存在从力学角度上增大了焊缝产生热裂纹的倾向,并且随着预拉伸应力的增加,产生的横向拉伸应力也随之增加,采用60,120,150和210 MPa应力时,试件在焊接试验时产生的热裂纹的长度分别为5.2,8.1,8.9和10.6 mm.试验结果表明了模拟计算结果的可靠性.
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| 关 键 词： | 预拉伸 数值模拟 残余应力 热裂纹 |
| 收稿时间： | 2008/4/29 0:00:00 |
Analysis on the tendency of welding hot cracks of aluminum alloy increased by longitudinal pre-tension |
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| ZHOU Guangtao,LIU Xuesong,YANG Jianguo and FANG Hongyuan.Analysis on the tendency of welding hot cracks of aluminum alloy increased by longitudinal pre-tension[J].Transactions of The China Welding Institution,2009,30(1):105-108. |
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| Authors: | ZHOU Guangtao LIU Xuesong YANG Jianguo and FANG Hongyuan |
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| Affiliation: | 1.State Key Laboratory of Advanced Welding Production Technology;Harbin Institute of Technology;Harbin 150001;China;2.Institute of Astronautical Technology;Shenyang Institute of Aeronautical Engineer;Shenyang 110034;China |
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| Abstract: | Numerical simulation calculation of TIG welding of thin wall aluminum cylinder by the thermo-elastic FEM has been conducted.Based on the generating of analysis model,the values and distribution at the centre of weld seam for transverse tensile stress and strain produced by pre-tension upon the solidification metal at the back of molten pool.Experiments were performed to verify the simulation results.It can be drawn that,for weld metal just solidified at the joint pre-tension load can produce transverse tens... |
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| Keywords: | pre-tension numerical simulation residual stress hot cracks |
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