摘要
为了研究焊接热输入对8万吨模锻压机主缸材料20MnNiMo焊接残余应力的影响,制定了不同热输入条件下的焊接方案,并通过盲孔法对残余应力进行了测定。实验结果表明,焊接接头残余应力的分布和大小是随着焊接热输入的减小而不断变化的。当焊接热输入由27.3 J/cm变化到24.6 J/cm时,焊接接头焊缝区x方向残余应力减小16%;热影响区x方向残余应力减小33%,y方向残余应力减小52%;焊缝区x方向残余应力减小49%,y方向残余应力增加49%;其中,焊接热输入的变化对y方向残余应力影响最大。在相同焊接效率条件下,焊接热输入越小,材料20MnNiMo的焊接残余应力越小。
Effect of different welding heat input on welding residual stress in master cylinder of 20MnNiMo steel for 80000 tons forging press were observed and studied. The residual stress of thick plate 20MnNiMo steel joints was measured by the blind hole drilling method. The experimental results show that welding residual stress distribution and magnitude are changed with the increase of heat input. When the welding heat input is reduced from 27.3 J/cm to 24.6 J/cm, the residual stress in the weld zone of welded joints in X-direction decreases by 16% ; the residual stress in heat-affected zone of welded joints in X-direction decreases by 33% , and the residual stress in heat-affected zone of welded joints in Y-direction increased by 52%. The effect of welding heat input on residual stress in Y-direction is the greatest. In the same welding efficiency conditions, the smaller the welding heat input, the smaller the welding residual stress.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第1期76-80,共5页
Transactions of Materials and Heat Treatment
基金
科技重大专项子课题项目(2009ZX04014-064-05)
关键词
低合金钢
埋弧焊
残余应力
热输入
盲孔法
Low alloy steel
submerged arc welding
residual stresses
heat input
hole-drilling method
