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Mohammad Bagher Nasiri,Masoud Behzadinejad,Hamidreza Latifi,Jukka Martikainen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
Arc efficiency of Gas Tungsten Arc Welding (GTAW) was determined by calorimetric method. A water-cooled anode calorimeterwas designed and manufactured to measure the arc thermal efficiency, which was determined as a function of current, arc length, polarityand gas flow rate for GTAW of mild steel. With Direct Current Electrode Negative (DCEN) polarity and 5 mm arc length, a thermalefficiency of 67±4% was obtained, which was independent of the welding current. With Direct Current Electrode Positive (DCEP) polarityand 5 mm arc length, arc thermal efficiency was determined as 52±4%. The experimental data show that the arc efficiency decreasesfrom 67% to 58% and 51% as the arc length increases from 5 mm to 11 and 17.5 mm, respectively. The experimental results also showthat the arc efficiency is not significantly affected by the shielding gas flow rate.