Effects of External Magnetic Field on Mechanical properties of a welded M.S metal through Metal Shield Arc Welding

Abstract

The aim of this study is to show the characteristic changes obtained by the deflection of welding arc in the presence of external magnetic field. The magnetic field has been applied from various orientations upon the weld bead. The welding process which has been considered under study is shielded metal arc welding on Mild steel plate. The objective of this paper is to study effect of magnetic field on the weld quality and geometry when the field is applied longitudinal to the electrode travel i.e. the field lines are perpendicular to the electrode travel. However there is lack of information for optimum parameters, very little work has been reported in this direction. A magnetic field externally applied to the welding arc, deflects the arc by electromagnetic force in the plane normal to the field lines. The magnetic field exerts force on the electrons and ions within the arc, which causes the arc to be deflected away from the normal arc path. The welding arc can be deflected forward, backward, or sideways with respect to electrode and welding direction depending upon the direction of an external magnetic field. In this paper various mechanical properties tests such as tensile strength, hardness, impact test etc. are conducted to see the effect of external magnetic field on it. It is observed that weld pool penetration reduces while the weld bead width increases thereby affecting the parameters of the process. The results and conclusions are discussed as per the observations while the tensile strength and hardness of parent materials are observed as well.