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按规范设计的焊接结构中,焊接接头是最薄弱的部位。这不仅是因为焊接热循环使接头区材质恶化,而且就缺陷的集中程度以及应力水平而言,该部位也是整个结构中的危险区域。因此,研究焊接接头的断裂特征,确定接头的转变温度,乃是焊接结构断裂安全分析的主要内容。试验方法虽然很多,但在目前,从模拟结构的拘束状态,以及材质和焊接工艺对接头断裂特征的影响来看,全板厚带缺口和残余应力焊
According to the standard design of the welded structure, welded joints are the weakest parts. This is not only because the weld thermal cycle deteriorates the material of the joint area, but also for the concentration of defects and the level of stress, this area is also a danger area throughout the structure. Therefore, studying the fracture characteristics of welded joints and determining the transition temperature of welded joints are the main contents of the safety analysis of welded structures. Although there are many test methods, at present, judging from the restraint state of the simulation structure and the influence of the material and the welding process on the fracture characteristics of the joint, the full plate thickness gap and residual stress welding