Mechanism of biaxial pre-stress method on welding residual stress and hot cracks controlling  

作　　者：刘雪松 周广涛 王苹 刘昊元 方洪渊 

机构地区：[1]State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001

出　　处：《China Welding》2009年第1期40-42,共3页中国焊接（英文版）

摘　　要：Based on the conventional uniaxial pre-tensile stress method during welding, this study presents a new method of welding with biaxial pre-stress. With the help of numerical simulation, experiments were carried out on the self-designed device. Except for the control on residual stress and distortion us-welded, the experimental results also show its effect on the prevention of hot cracks, thus this method can make up for the disadvantage of the conventional pre-stress method. Hot cracks disappear when the value of pre-stress surpasses 0. 2 σs（yield limit）. Welded thin plates with low-level residual stress, little distortion and no hot cracks are obtained with longitudinal pre-tensile stress level between 0. 6σsand 0. 7σs and precompressive stress between 0. 2 σs and 0. 3 σs in transverse direction.Based on the conventional uniaxial pre-tensile stress method during welding, this study presents a new method of welding with biaxial pre-stress. With the help of numerical simulation, experiments were carried out on the self-designed device. Except for the control on residual stress and distortion us-welded, the experimental results also show its effect on the prevention of hot cracks, thus this method can make up for the disadvantage of the conventional pre-stress method. Hot cracks disappear when the value of pre-stress surpasses 0. 2 σs（yield limit）. Welded thin plates with low-level residual stress, little distortion and no hot cracks are obtained with longitudinal pre-tensile stress level between 0. 6σsand 0. 7σs and precompressive stress between 0. 2 σs and 0. 3 σs in transverse direction.

关 键 词：biaxial pre-stress method welding residual stress and distortion hot cracks simulation 

分 类 号：TG409[金属学及工艺—焊接] TU375.2[建筑科学—结构工程]