Investigation on Effect of Heat Input on Cooling Rate and Mechanical Property (Hardness) Of Mild Steel Weld Joint by MMAW Process
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2015, Vol 5, Issue 3
Abstract
The effect of heat input in MMAW arc welding on cooling rate and hardness of weld joint is investigated in this paper. The parameter affects the heat input are welding current, arc voltage and welding speed. Mild steel weldments were welded under varying current 80, 90 and 100 ampere and keeping arc voltage and travel speed constant. Other mild steel specimens were welded under varying arc voltage 21V, 23V and 25V and keeping welding current and welding speed constant. Other mild steel specimens were welded by varying welding travel speed 1.52 mm/sec, 1.67 mm/sec and 1.82 mm/sec and keeping arc voltage and welding current constant. Heat input was calculated for each weldment. Rockwell hardness testing of all specimens was done. It was observed that with increase in arc current hardness of mild steel weld joint was increased up to optimum level and then decreased. Cooling rate was decreased with increased in arc current. With increase in welding arc voltage hardness of weld joint decreased and cooling rate was decreased also. With increase in welding travel speed hardness of weld joint increased and cooling rate was increased also.
Authors and Affiliations
Merchant Samir Y
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