INVESTIGATION IN TO INFLUENCE OF WELD BEAD CHARACTERISTICS AND SPATTER LOSS THROUGH SUPER IMPOSITION OF WELDING ARC BY MAGNETIC FIELD IN CO2/MIG WELDING

Abstract

Since its inception in 1948 MIG welding has grown with rapidity both in amount of application and in variety of techniques and equipment available for various type of work. Due to the high cost of inert gas the interest was directed to carbon dioxide for shielding. The ability of carbon-dioxide to dissociate and recombine permits more heat energy to be observed in the gas. The present work has been carried out to study the influence of external magnetic fields on CO2 weld characteristics and spatter loss. Definite influence of external magnetic field on weld bead geometry, grain refinement, are stability, and spatter loss have been reported in case of TIG, MIG and SAW. The interaction between the magnetic field of the arc itself and magnetic field externally superimposed on welding arc influences the transport of heat from the electrode to the work piece this regulating the shape, size and appearance of welds by changing the nature of metal transfer and associated parameters