Investigation of post-weld rolling methods to reduce residual stress and distortion
Investigation of post-weld rolling methods to reduce residual stress and distortion
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DOI：
10.1016/j.jmatprotec.2017.04.018
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发表时间：
2017-09-01
影响因子：
6.3
通讯作者：
Wen, Shuwen
中科院分区：
文献类型：
--
作者：
Cozzolino, Luis D.;Coules, Harry E.;Wen, Shuwen
焊后轧制的机理以及如何减少和消除残余应力和变形，人们了解得很少。对两种不同的轧制方法进行了有限元分析：用单辊直接轧制焊头和在焊头旁边用双平辊轧制焊头。模型表明，两种轧制工艺均能在焊缝区域产生压应力，且压应力随轧制载荷的增大而增大。应力分布对工件与滚轮和支承杆之间的摩擦系数敏感。高摩擦系数集中了焊缝中心的塑性变形和压应力。可通过滚动消除变形；然而，实验表明，这只有在直接应用于焊缝时才能实现。
The mechanisms of post-weld rolling and how it reduces and eliminates residual stress and distortion are poorly understood. Finite element analysis was applied to two different methods of rolling: rolling the weld bead directly with a single roller and rolling beside the weld bead with a dual flat roller. The models showed that both rolling techniques were able to induce compressive stress into the weld region, which increased with rolling load. The distribution of stress was sensitive to the coefficients of friction between the workpiece and the roller and the backing bar. High friction coefficients concentrated the plastic deformation and compressive stress within the centre of the weld bead. Distortion can be eliminated by rolling; however, the experiments indicated that this was only achieved when applied to the weld bead directly.