ABSTRACT Improving penetrability is a key issue in plasma arc welding (PAW). Increasing plasma energy is one way to improve arc penetrability. Gas focusing plasma arc welding (GF-PAW) platform is self-designed and developed. Role and action mechanism of focusing gas is initially studied. Focusing gas makes no obvious effects on arc pressure distribution and value. Focusing gas changes arc temperature distribution outer orifice, while focusing gas does not affect arc temperature distribution inner orifice. Focusing gas can constrict arc and arc energy increases 210 W with an increase in arc voltage of 1.4 V. GF-PAW can fully penetrate the whole work-piece while PAW can only partially penetrate the work-piece under welding current 150 A. GF-PAW can improve penetrability, and may increase welding speed, and has a potential application in manufacturing.

中文翻译：

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气体聚焦等离子弧焊中的电弧行为和焊缝形成

摘要 提高渗透性是等离子弧焊 (PAW) 的一个关键问题。增加等离子体能量是提高电弧穿透性的一种方法。自主设计开发的气体聚焦等离子弧焊（GF-PAW）平台。初步研究了聚焦气体的作用和作用机理。聚焦气体对电弧压力分布和值没有明显影响。聚焦气体改变电弧温度分布外孔口，而聚焦气体不影响电弧温度分布内孔口。聚焦气体可以收缩电弧，电弧能量增加210 W，电弧电压增加1.4 V。GF-PAW可以完全穿透整个工件，而PAW在焊接电流150 A下只能部分穿透工件。GF- PAW 可以提高穿透性，并可能提高焊接速度，