Study the change of current weld on mechanical properties and microstructure of low carbon steel welded by electric arc welding

Abstract EN

The welding is one of necessary and important process which is used in manufacturing operations to join two or more materials of the similar or dissimilar pieces to achieve complete cohesion.

This work focuses on the effect of current change and welding method during welded low carbon steel (steel 37) by electric arc welding on microstructure and mechanical properties such as (tensile strength, hardness and impact strength ).

The welding currents were chosen are (60, 80, 100, 120, 140 and 160A ), and the weld was done by two directions ( top and bottom sides).

The tensile, impact, hardness and microstructure tests were done to locate the mechanical properties of the welded joint.

The results showed that when the welding current increase, the tensile strength was increase from (349.07 to 369.44)MPa while the impact strength and hardness decrease.

Microstructure of welding region has been dealt with it for each sample and for every increase of welding current