REVIEW ON EFFECT OF HEAT INPUT ON TENSILE STRENGTH OF BUTT WELD JOINT USING MIG WELDING
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Abstract
Present work investigates the effect of heat input (controlled by welding current, welding voltage andwelding speed) on tensile strength, micro-hardness and microstructure elements produced by shielded metal arc welding (SMAW). From the experimental results it was found that the increase in heat input affects the micro-constituents of base metal, and heat affected zone (HAZ). Tensile strength decreaseswith increase in heat input and from scanning electron microscopy of tensile test fractured surfaces exhibited ductile & brittle failure. From micro hardness data values it was observed that hardness of material increases with increase in heat input in weld pool and decreases in HAZ zone. Optical microscopy shows that smaller dendrite sizes and lesser inter-dendritic spacing were observed in the fusion zone at low heat input.
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