【摘要】 采用钻孔_电测法对LY12铝合金垂直于焊缝方向的焊接残余应力及其分布规律、产生的原因进行了分析,探讨了残余应力的消除措施.研究表明:板厚为6mm的LY12铝合金的焊接残余应力呈双向应力状态;垂直于焊缝方向的残余应力,在焊缝上的应力较大,沿远离焊缝方向逐渐减小,纵向残余应力σx比横向残余应力σy大得多.热处理后的结头强度为236.5MPa,比未处理的强度提高58.7%.更多还原

【Abstract】 In this paper,welding residual stress vertical to welding seam in LY12 armour aluminum alloy was measured by hole-drilling and electrical-measurement method.At the same time,the regular patter of distribution and the steps of eliminating residual stress are explored.Experimental results show:The technique of hole drilling to measure welding residual stress in LY12 aluminum alloy of thickness of 6mm is effective in practice;The distributed character istics of residual stress vertical to welding seam is apparent;The stress in welding seam is stronger,it becomes gradually weaker far from welding seam;The value of the longitudinal residual stress is higher than the value of the crosswise,but they are all weaker than the value of failure limit stress of LY12.The heat treatment can improve joint strength by 58.7%.更多还原