Influence of arc pressure on the forming of molten pool in tungsten inert gas arc butt welding with micro gap for tantalum sheet

Arc pressure is the key influencing factor to forming of molten pool. Countering the characteristic of tungsten inert gas arc welding with micro gap for tantalum sheet, according to the fundament of arc physics, a distribution model of arc pressure and forming mechanism of molten pool with micro butt gap are proposed, and the influences of arc pressure on forming of molten pool are discussed. Experimental researches for the dynamic formation process of weld molten pool by using high-speed vidicon camera show that when butt gap is appropriate, that is from 0. 1 to 0. 15 mm, molten metals formed on two workpiece uplift and grow up first, then are fused and form uniform molten pool finally.

GPW-1200气压焊轨机焊接工艺研究

文章采用GPW-1200气压焊轨机对鞍钢P60,U75V进行焊接型检实验,分析了环境温度、焊前准备和工艺参数的确定对焊接过程和焊接工艺的影响,提出了提高焊接稳定性的技术方法,进而保证钢轨焊接质量。

钢轨恒位移控制气压焊接温度场模拟研究

在钢轨气压焊加热过程中,由于存在火焰干扰,实时检测焊接温度十分困难,无法实现焊接温度和质量的自适应控制。本文利用新型数控气压焊轨机,依据钢轨加热纵向膨胀热应力与温度场之间存在的物理性质对应关系,采用ANSYS有限元软件分析方法,对顶锻力为720和1200 kN的两种数控气压焊轨机,在恒位移控制工艺条件下,对实时采集获得的保压压力参数进行统计,对其表征焊接温度场特征的信息进行分析和模拟计算,获得了钢轨气压焊接温度场模拟结果。结果表明,在钢轨气压焊恒位移控制新工艺条件下,无论设备顶锻力大小,只要监控保压压力参数,经过程序控制计算,就能够监控钢轨气压焊接温度场。经平原和高原地区现场焊轨工程应用,该种质量控制方法实用性良好,焊接质量稳定。