Single pass full penetration joining for heavy plate steel using high current GMA process
Single pass full penetration joining for heavy plate steel using high current GMA process
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DOI：
10.1007/s40194-017-0464-7
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发表时间：
2017-09-01
影响因子：
2.1
通讯作者：
Tanaka, Manabu
中科院分区：
文献类型：
--
作者：
Baba, Hayato;Era, Tetsuo;Tanaka, Manabu
在使用100%CO2作为保护气体和碳钢实心焊丝的气体保护金属极电弧焊接（GMAW）中，随着电弧电压降低，电弧长度缩短，并且电弧正下方的熔池表面在高电流范围下变得凹陷。并且电弧最终在熔池表面下方的较低位置处和由熔池壁形成的空间中产生。在该金属转移模式中，即使在高电流范围，飞溅产生水平也极低。本文介绍了450 A以上大电流埋弧的稳弧技术，用X射线观察系统和高速摄像机拍摄了以低碳钢为母材，1.2mm碳钢实心焊丝，100%CO_2为保护气体的电弧现象，通过外特性控制的大电流埋弧焊接电源（最大电流1000 A，最大送丝速度100 m/min），在大于450 A的电流范围内，出现了包括旋转过渡模式在内的三种过渡模式。因此，已经开发了一种新的电流波形控制，其结合了外部特性的适当梯度和低频电压振荡，其实现了更稳定的大电流埋弧，以便使用这些特定的金属过渡模式来改善焊道形成。
As an arc voltage decreases, an arc length shortens and a surface of molten pool right under the arc becomes dented at a high current range in gas metal arc welding (GMAW) using 100% CO2 as a shielding gas and a carbon steel solid wire. And the arc is finally generated at a lower position under the surface of the molten pool and in a space formed by a wall of molten pool. A spatter generation level is extremely low even at a high current range in this metal transfer mode. This arc phenomenon is referred to as "buried arc" and the arc stabilization technique at the high current buried arc more than 450A is described in this report.The arc phenomenon taken by an X-ray observation system and a high-speed video camera were observed using a low-carbon steel as a base metal, a carbon steel solid wire of 1.2 mm, 100% CO2 as the shielding gas, and travel speed of 30 cm/min. The high current buried arc stabilized by an external characteristic control of welding power source (maximum current 1000 A, maximum wire feed rate 100 m/min) showed three kinds of metal transfer mode including rotating transfer mode at the current range more than 450 A. Consequently, a new current waveform control combined an adequate gradient of the external characteristic and a low-frequency voltage oscillation, which realizes more stable high current buried arc, has been developed in order to improve a weld bead formation using these particular metal transfer modes.