The present work had as its objective to evaluate the mechanical properties and to carry out the metallographic characterization of the butt welded joints of ASTM A36 steel, with ER70S-6 filler material under the GMAW process, it was developed from a quantitative point of view attached to a correlational and experimental approach, by means of data collection techniques and content analysis, the initial parameters to take into account in the welding process were established, being these: voltage, amperage, and wire feed speed, developed the experimental process, proceeded to evaluate the properties and metallographically characterized the welded joints. Three plate thicknesses were analyzed, which were welded in various combinations with different parameter values, obtaining four combinations for each thickness. In each of these combinations, ultrasonic, tensile, face bending, and root tests were carried out and, subsequently, metallographic analysis was performed, focusing on three analysis zones: fusion zone, heat affected zone, and base metal zone. In addition to this, the width of the heat-affected zone, grain size, and hardness were determined. Based on the above, five combinations were identified whose beads showed good properties, with the 250 IPM combinations being the most outstanding, given that, with different voltage and amperage ranges, the welded joints showed good weldability in the three thicknesses considered.

Welding; metallography; ASTM A36 steel; mechanical properties.