一种降低残余应力的新方法——脉冲磁处理法

A New Residual Stress Reducing Method——pulsed Magnetic Treatment

摘要: 脉冲磁处理是一种崭新的非热处理型降低焊接结构中残余应力的方法,本工作在国内外属首次开展定量研究。由试验证明,无论是定拘束单向拉伸试样,还是焊接试样,适当的强脉冲磁处理后,残余应力水平均发生了明显的下降。在大刚度拘束焊接试样上的结果表明,在距焊缝40 mm附近处的纵向与横向残余应力下降了100~150 MPa,下降率达40%以上。原有不同水平的残余应力值都呈下降趋势,表现为纵向与横向残余应力分布曲线呈一定程度的整体下移。另外,采用适当次数强脉冲磁处理的效果更好。

Abstract: Pulsed magnetic treatment is a entirely new non heating method to reduce residual stresses. The tests show that properly strongly pulsed magnetic treatment can lead to stress relaxation in both rigid restrained tensile specimen and welded specimen. Especially, the longitudinal and the transverse residual stress distributions indicate a feature of whole reduction. In addition, the number of time of magnetic treatment has the influence on the effects.