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 8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予弧尾焰电压信号,对数值分析结果进行了实验验证.
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