among the more successful attempts to increase the penetration capability of the gta process have been investigative modifications of the shielding gas. weld studies involving reactive shielding gases such as chlorine, freon, and sulphur hexafluoride have shown that while reactive gases enhanced penetration, they also tend to rapidly destroy the tungsten electrode. in plasma processes, which utilize two gas flows, if an inert gas is used as the plasma gas ...
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