论文部分内容阅读
利用Level-Set理论与方法追踪小孔界面的演变过程,建立了等离子弧定点焊熔池与小孔的数学模型,对不锈钢试件等离子弧定点焊熔池的穿孔过程进行数值模拟,获得了多种工艺条件下熔池与小孔形状和尺寸的动态变化数据.结果表明,6 mm厚度不锈钢试件等离子弧定点焊,当焊接电流为170和180 A时,分别在2.7和2.5 s形成贯穿工件厚度的小孔;等离子弧定点焊过程中,小孔断面的形状由开始的U字型转为V字型,穿透工件后又呈现类似双曲线型.通过测量熔池穿孔时刻的等离子弧尾焰电压信号,对数值分析结果进行了实验验证.
Using Level-Set theory and method to track the evolution process of the small hole interface, a mathematical model of plasma arc fixed-point welding pool and small hole was set up to simulate the perforation process of plasma arc fixed point welding pool of stainless steel specimen, The results show that the plasma arc spot welding of 6 mm thick stainless steel specimen is formed at 2.7 and 2.5 s at the welding current of 170 and 180 A respectively. Thickness of the hole; plasma arc fixed spot welding process, the shape of the small hole cross-section from the beginning of the U-shaped to V-shaped, penetrating the workpiece and then showed a similar hyperbolic type by measuring the molten pool perforation time arc tail Flame voltage signal, the numerical analysis of the results of an experimental verification.