EVALUATION OF WELDING WIRE AWS 5.18 MAG USING THE ER70S-6 IN MAINTENANCE OF AISI 4140 STEEL PARTS

Abstract

As a result of the growing technological advance and contribution to market demand and current technological development, the study and application of steel focused on developing different mechanical and structural properties has become important for the industrial branch. In this context, welding is present. Therefore, the objective of this work is to evaluate the weld bead in the MAG welding process using AWS A5.18 ER70S-6 wire deposited in SAE 4140 steel, selecting welding parameters that are closer to the restoration of the original condition of the steel base metal. For this, the cut and the preparation of 5 samples welded by the MAG welding process were performed, in which the welding current and voltage parameters were varied with constant welding speed. In which the hardness measurements of the samples were performed and then the inlay followed by microstructural analysis. The results obtained with the analyzes were concrete due to the hardness obtained, however, the martensitic index increased due to the high cooling rate, allowing the embrittlement of the material and limiting its applicability.