低压环境对等离子弧穿透能力的影响
Effects of low pressure condition on penetration of plasma arc
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摘要: 设计了一套水冷铜阳极电弧力测试装置，测量了不同环境压力下等离子弧在穿透一定厚度工件后电弧压力的径向分布情况，研究了焊接电流、环境压力对于穿透电弧压力的影响规律. 结果表明，等离子穿透电弧压力在电弧中心区域最大，沿着径向从中心至边缘迅速减小. 在同一环境压力下，随着焊接电流的增加，等离子穿透电弧压力增大；当焊接电流相同时，在一定的压力范围内，随着环境压力的降低，等离子穿透电弧压力显著增大，且环境压力变化对于等离子穿透电弧压力的影响比焊接电流变化对其的影响更显著.Abstract: In the present paper, a water-cooled copper anode was designed. The radial distribution of arc column that after plasma arc penetrated the work-pieces was measured. The effects of welding current and ambient pressure on plasma penetrating arc pressure was studied. The experiment results refer that arc pressure of central area of arc column is maximum, which decreases rapidly along the radial from the center to the edge of arc column. The arc pressure increases with the increasing welding current in the same ambient pressure. Within a certain range of pressure, the arc pressure increases significantly with the deceasing ambient pressure in the same welding current. The change of ambient pressure has a more significant influence on arc pressure than the change of welding current.
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