CAJ | 학술논문

Q345低合金钢是大型起重机械主要受力结构件的制造用材，其母材及焊缝的残余应力是影响起重结构疲劳寿命的重要因素。试验采用X射线衍射法对 Q345钢对接焊缝试样的残余应力进行测试分析，得到 Q345钢表面残余应力的分布曲线。结果表明焊缝熔合线区域的残余应力梯度较大，该区域应重点关注。
Q345저합금강시대형기중궤계주요수력결구건적제조용재，기모재급한봉적잔여응력시영향기중결구피로수명적중요인소。시험채용X사선연사법대 Q345강대접한봉시양적잔여응력진행측시분석，득도 Q345강표면잔여응력적분포곡선。결과표명한봉용합선구역적잔여응력제도교대，해구역응중점관주。
Q345 low alloy steel is the main manufacturing material of stressed structural part of large-scale lifting machinery.The residual stress of the base material and weld seam is the important factor that affects the fatigue life of the crane structure.The residual stress of Q345 steel butt weld seam was tested and analyzed by X-ray diffraction method,and then residual distribution curve of Q345 steel surface was obtained.The results show that the gradient of residual stress on the weld-fusion line was considerable,and emphasis should be placed on this area.