EFFECT OF WELDING ON THE IMPACT TOUGHNESS OF LOW CARBON STEEL
Keywords:Welding, current, electrode diameter, Charpy impact test
The present study examines the effect of welding parameters on impact toughness of welded low carbon steel samples. The welding parameters selected were welding current and welding electrode diameter. The welding operation was conducted on low carbon mild steel specimens. The welding currents used for welding the specimen were 95, 110 and 125 Amps and the electrode diameters used were 2.5 mm, 3.2 mm and 4 mm respectively. The specimens were welded at the junction of the 450V-notch primarily to facilitate Charpy impact test rig for determining impact toughness. The results showed that, an increase in the welding current results in increase in the impact toughness of the weld. Moreover, impact toughness of the welded specimen also increased as the electrode diameter increased from 2.5 mm to 3.2 mm, however decreased for further increase of 4mm. This is mainly due to residual stresses in welded joint that primarily develops due to differential weld thermal cycle (heating, peak temperature and cooling at the any moment during welding) experienced by the weld metal and region close to fusion boundary i.e. heat affected zone.
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