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An arc current in Gas Tungsten Arc (GTA) is originated mainly from thermionic electron emission on the high temperature cathode surface. Therefore it is significantly important to understand the temperature distribution on the cathode surface to realize required properties of GTA. In material processing such as arc welding, it has been experimentally confirmed that a large quantity of metal vapor...
The characteristics of a CO 2 -shielded arc are studied to evaluate its potential as a novel heat source for material processing, with lower costs and higher productivity than that of the tungsten–inert gas (TIG) arc. A double-gas-shielded system, using both CO 2 and an inert gas, is employed for the arc torch; this minimizes consumption of the tungsten electrode and gives arc stability...
Energy source properties of gas tungsten arc (GTA) strongly depend on physical property of a shielding gas. For its low electrical conductivity, helium (He) is employed as a shielding gas for conditions requiring high productivity in GTA-welding process. However, the high cost of He limits its applications. Therefore, an alternative shielding gas with lower cost and better energy source properties...
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