The Influence of Electrode Polarity and Welding Current on Mechanical Properties of Submerged Arc Weld
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Authors
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Defence Metallurgical Research Laboratory, Hyderabad - 258 ,IN
G. Madhusudhan Reddy -
Welding Research Laboratory, University of Roorkee, Roorkee ,INP. K. Ghosh
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Welding Research Laboratory, University of Roorkee, Roorkee ,INAshok Khanna
Abstract
An experimental study has been made on the effect of electrode polarity on macrostruclure and mechanical properties of multipass submerged arc welds. The influence of welding current with two polarities has been studied. The welds are made by using C-Mn filler wire and basic flux. Weld deposites were characterised on the basis of tensile properties, hardness measurements and charpy impact toughness. The study of macro structure of weld deposites shows that the amount of reheat refined weldmetal increases with decreasing welding current with DCEP than that observed with DCEN. Hardness survey on the transverse section along the vertical line of the weld deposite revealed that higher hardness occured in the coarse micro structural region than the reheat refined region of the weld deposite. The charpy V-notch impact results show better toughness in the welds deposited at lower level of current with DCEP than that observed at DCEN. Yield strength and ultimate tensile strength are higher with DCEN than that observed in case of DCEP.
