Reduce the Residual Stress of Welded Structures by Post-Weld Vibration
Reduce the Residual Stress of Welded Structures by Post-Weld Vibration
复制标题
DOI：
10.4028/www.scientific.net/msf.490-491.102
复制
发表时间：
2005-04
期刊：
影响因子：
--
通讯作者：
D. Rao;Zhengqiang Zhu;L. Chen;C. Ni
中科院分区：
文献类型：
--
作者：
D. Rao;Zhengqiang Zhu;L. Chen;C. Ni
焊接过程中残余应力的存在是焊接金属结构产生裂纹和变形的重要原因，对结构的疲劳寿命和尺寸稳定性有很大影响。热处理是消除残余应力的传统方法之一。但它往往受到制造条件和结构尺寸的限制。本文讨论了一种称为振动时效(VSR)的工艺。振动时效是通过焊后机械振动降低和重新分布焊接结构内部残余应力的过程。研究了振动时效对提升机卷筒和厚板等焊接结构残余应力的影响。文中对VSR工艺参数进行了描述。用打孔法测量了振动时效处理前后焊缝上的残余应力，观察到残余应力降低了30%~50%。结果表明，采用振动时效工艺可以有效地降低中碳钢(Q345)和不锈钢(304L)焊接结构的残余应力。
The existence of residual stresses caused by the welding process is an important reason of cracking and distortion in welded metal structures that may affect the fatigue life and dimensional stability significantly. Heat treatment is one of the traditional methods to relieve the residual stresses. But it is often limited by the manufacturing condition and the size of the structures. In this paper a procedure called vibratory stress relief (VSR) is discussed. VSR is a process to reduce and re-distribute the internal residual stresses of welded structures by means of post-weld mechanical vibration. The effectiveness of VSR on the residual stresses of welded structures, including the drums of hoist machine and thick stainless steel plate are investigated. Parameters of VSR procedure are described in the paper. Residual stresses on weld bead are measured before and after VSR treatment by hole-drilling method and about 30%~50% reduction of residual stresses are observed. The results show that VSR process can reduce the residual stress both middle carbon steel (Q345) and stainless steel (304L) welded structures effectively.