Study of geometric and economic characteristics of overlay welds for processes MIG and MIG-CW

This paper aims to compare the geometric and economic characteristics for MIG and MIG-CW processes, aiming to analyze the productivity gain with the addition of cold wire. The welding of stainless steel were deposited by the MIG and MIG with addition of cold wire, MIG-CW, processes in the flat position and drawing direction of welding, automated. The base metal used was 1020 steel in plates with a thickness of 6.3 mm. The protection gas used was Ar-2%O(2) at 15 L/min. After performed the welding, the samples were selected and properly prepared by sanding and were attacked for macrographs analysis, for the measuring of penetration and reinforcement values were used an aid of software for the calculation of dilution. The results showed an increase in the amount of mass deposited in function of the time for the MIG-CW without affecting the surface quality of the weld, and reduced penetration which is good for overlaying welds in dissimilar materials, because it will decrease the dilution.