Compared to conventional MIG welding, the MIG welding with filler wire, where a filler wire is fed into MIG welding arc, improves efficiency by minimizing the heat input and increasing the deposition rate. However, discussion arises on controlling the convex bead which arises at increased deposition rate. In this study, it is attempted to control the uneven bead in the MIG welding with filler wire by applying magnetic control of the arc. Furthermore, possibility of controlling the weld metal content is investigated which is favourable for cladding by welding of dissimilar metal i.e. clad steel, corrosion and heat resistant alloys and so on. The diameter of the filler wire was 1.2 mm, the electric current for the welding was 180-350A, the magnetic field for oscillating the arc was 0.004-0.006T and 5Hz. Experimental results showed that the bead of excellent appearance was obtained and it could be flattened by applying magnetic field even at increased deposition rate of MIG welding with filler wire. The penetration was found to be approximately 50% of conventional MIG welding. It was also found possible to control the amount of Ni and Cr, which are important elements for corrosion and heat resistant alloys, and to deviate for them to the bead surface by varying composition and feed rate of the electrode wire and the filler wire. It is said from these findings that this welding method is suitable for cladding by welding to improve efficiency and quality.