激光焊接技术在轨道交通车辆中的应用

为解决轨道交通车辆不锈钢车体电阻点焊的外观质量差、密封性差、效率低等缺点,对部分熔透激光焊接工艺在不锈钢车体焊接中的应用开展了研究。研究包括:部分熔透激光叠焊原理、参数优化试验、显微组织分析、疲劳性能分析,以及激光焊接不锈钢车辆侧墙的结构改进。研究结果表明,不锈钢车体焊接中采用部分熔透激光叠焊工艺,可以获得高质量的表面状态及疲劳强度,车体结构强度高于EN12663标准中的要求。

Application of Laser Welding Technology in Rail Transit Vehicles

In order to solve the defects in resistance spot welding of the stainless steel rail vehicles,such as the poor appearance,poor sealing and low efficiency,the application of partial penetration lap laser welding technology in rail transit stainless steel vehicle car-body welding is studied,including the principle of partial penetration laser stack welding, parameter optimization test, micro-structure analysis, fatigue performance analysis and the structural improvement of laser welding stainless steel vehicle sidewall are systematically studied. The research results show that the surface condition and fatigue strength of the car-body are improved,the car-body structural strength is higher than the requirements of En12663 standard.