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用激光焊接技术代替电阻点焊可以改善不锈钢车体外观质量较差和密封性不良的问题,但由于非熔透型激光叠焊工艺的局限性,侧墙焊缝处会产生内外钢板局部未焊透的现象即焊缝缺陷.为研究这种焊缝在不同缺陷率下的拉剪强度及其对车体静强度的影响,结合某不锈钢地铁车辆激光焊车体,通过建立不同焊缝缺陷率的车体有限元模型,分析各个工况下不同焊缝缺陷率的车体侧墙焊缝剪应力的变化,以此确定在静载工况下不锈钢激光焊车体侧墙焊缝缺陷率的限值.
The use of laser welding technology instead of resistance spot welding can improve the appearance of stainless steel body poor quality and poor sealing problems, but due to the limitations of non-penetration laser lamination process, Through the phenomenon of the weld defects.In order to study the tensile shear strength of the weld under different defect rates and its impact on the static strength of the car body, combined with a stainless steel laser welding car body, through the establishment of different weld defect rate The finite element model of the vehicle body was established. The changes of weld shear stress of the side wall of the vehicle body under different working conditions were analyzed to determine the defect rate of the weld on the side wall of the stainless steel laser welded body under static load. Limits.