Investigation on Effect of Welding Current on Welding Speed and Hardness of Haz and Weld Metal of Mild Steel

Purpose The purpose of this paper is to investigate the prominence of mechanical excitations at the time of welding. In the past years, the process of welding technology has expanded its influence in manufacturing. The crucial drawback of conventional welding is prompted by internal stresses and distortions, which is the focal reason for weld defects. These weld defects can be diminished by the process called post-weld heat treatment (PWHT), which consumes more working hours and needs skilled workers. To replace these PWHT processes, mechanical vibrations are introduced during the process of welding to diminish these weld defects. Design/methodology/approach In the current research, the mechanical vibrations are transferred to weld-pool through vibro-motor and DC motor connected to the electrode. As per standards, the tensile test specimens were prepared for welding with different voltages of vibro-motor and DC motor respectively. The weld joints were tested for tensile strength and analyzed the microstructure at the fusion zone. Findings Melt-ability at fusion zone of 1018 mild steel was investigated by the single-stroke intense heat process of fusion welding. It is observed that the mechanical vibrations technique has a profound influence on the enhancement of the fusion zone characteristics and grain structure. The peak value of the tensile strength is observed at 100 s of vibration, 190 V of vibro-motor voltage and 18 V of electrode voltage. The tensile strength of the welded joints with vibrations is increased up to 22.64% when it is compared with conventional welding. The enhancement of the tensile strength of the weld bead was obtained because of the formation of fine grain structure. So, mechanical vibrations are identified as the most convenient method for improving the mild steel alloys weld quality. Originality/value A novel approach called mechanical vibrations during the process of welding is implemented for fusion zone refinement.

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Investigation on Effect of Welding Current on Welding Speed and Hardness of Haz and Weld Metal of Mild Steel

Abstract: The effect of welding current on welding speed and hardness of heat effected zone and weld metal of mild steel material is investigated in this paper. Mild steel weldment was welded under varying welding current i.e. 80, 85, 90, 95 &

Cited by 5 publications

References 3 publications

Temperature distribution in thermal processes

Temperature distribution in thermal processes

Experimental investigation of effects of welding current and electrode angle on tensile strength of shielded metal arc welded low carbon steel plates

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

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