Influence of Welding Parameters and Shielding Gas on Arc Characteristics and Behavior of Metal Transfer In GMA Welding of Mild Steel
Authors
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Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee ,IN
P. K. Ghosh -
Fugetechnik und Bechichtungtechnik, Sekr. EB 5, TU Berlin, 10623-Berlin ,DELutz Dorn
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K. de
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Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee ,INVakumaran
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Fugetechnik und Bechichtungtechnik, Sekr. EB 5, TU Berlin, 10623-Berlin ,DEF. Hofmann
Keywords:
GMAW, Arc Voltage, Welding Current, Arc Profile, Arc Pressure, Arc Deflection, Metal Transfer.Abstract
The effects of welding parameters under Ar+18%CO2 and argon gas shielding on arc characteristics and behaviour of metal transfer in GMAW using mild steel filler wire have been studied by video-graphy of arc environment. The measured ischolar_main diameter, projected diameter, length and deflection of arc as well as the transferred droplet diameter at the time of detachment along with the estimated arc stiffness have been measured and correlated to the welding parameters under different gas shielding. It has been observed that the arc characteristics with respect to its shape, stiffness and spreading over the weld characteristics significantly vary with welding current and arc voltage giving due consideration to the shielding environment. The use of argon gas shielding appreciably reduces the arc deflection and enhances the DR, DP and L with respect to that observed under Ar+18%C02 gas shielding.
