General investigation on weldmatching in strength

Inl this investigation the different tests were carried out on the butt joints of several kinds of steels to study the effects of weldmatching on the fracture initiation under statie and dynamic loading, on the fracture propagating arresting properties, on the fatigue behavior and finally on the residual stress distribution, The testing results show that overmatching of metal increases the possibility of having a general yieleding and may help to enlarge the tolerate of weld defects for crack initiation under dynamic or static loading. In the propagating and arresting cases the beneficial effct of overmatching of weld metal was found .However non significant effect of the weldmatch mg on the propagation thresholds △Kth and da'dN was found.

不同强度匹配的焊接接头裂纹扩展特性

对由ＬＢ５２ＮＳ焊条施焊的Ａ１３１和Ａ５３７钢的焊接接头进行了动态撕裂（ＤＴ）试验．以研究焊缝金属强度匹配对裂纹扩展特性的影响结果表明，在接近ＮＤＴ温度时．两种接头的动态撕裂能（ＥＤＴ）没有显著差别；但在较高的温度．较高强度匹配的焊缝是有利的，对试验数据的统计分析表明．动态撕裂能ＥＤＴ和剪切面积百分比Ｓａ均服从正态分布规律。