存在不对中缺陷的焊接接头疲劳试验数据修正方法研究(上)  

Research on the Method for Correcting Fatigue Test Data of Welded Joints with Misalignment Defects(Part 1 of 2)

作　　者：张闰琦 王令军 宋坤林 曲华 王成琪 赵金凤 ZHANG Runqi;WANG Lingjun;SONG Kunlin;QU Hua;WANG Chengqi;ZHAO Jinfeng

机构地区：[1]国家高速列车青岛技术创新中心,山东青岛266109 [2]中车齐齐哈尔车辆有限公司大连研发中心,辽宁大连116052

出　　处：《铁道技术监督》2025年第1期41-44,共4页Railway Quality Control

基　　金：国家重点研发计划(2022YFB4300100)。

摘　　要：焊接过程中不可避免产生焊接构件间轴向不对中、角变形等缺陷,这会导致弯曲应力增加,降低结构的抗疲劳性能。采用不同修正公式量化不对中缺陷所导致的应力集中,以等效结构应力为参数,分析承载十字接头与T型接头的疲劳试验数据。考虑不对中缺陷试件在进行疲劳试验时出现的夹具效应,通过修正夹具效应公式,确定含不对中缺陷的焊接接头疲劳试验数据最优修正方法。During the welding process,it is inevitable to produce misalignment defects such as axial misalignment and angular deformation between welded components,which leads to an increase in bending stress and a decrease in the fatigue resistance of the structure.The paper quantifies the stress concentration caused by misalignment defects by using different correction formulas,and analyzes the fatigue test data of load-bearing cross joints and T-joints by using equivalent structural stress as the parameter.Considering the fixture effect that occurs during fatigue test of speci-mens with misalignment defects,the optimal correction method for fatigue test data of welded joints containing mis-alignment defects is determined by modifying the fixture effect formula.

关 键 词：焊接接头 轴向不对中 角变形 应力集中 疲劳试验 等效结构应力 

分 类 号：TG404[金属学及工艺—焊接]