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.
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...
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第1期105-108,118,共5页
Transactions of The China Welding Institution
关键词
预拉伸
数值模拟
残余应力
热裂纹
pre-tension
numerical simulation
residual stress
hot cracks
