Influência da energia de soldagem e do tecimento sobre a geometria do cordão de solda na soldagem de revestimento

Abstract

The welding of coating of carbon steels with stainless steels has gained prominence in the industrial environment in recent years for allowing surfaces with anti-corrosive properties to be obtained from low-cost materials, such as carbon steels or low-alloy steels. However, in order to ensure the final quality of the coatings, it is important that the welding procedure used is well adjusted, so that the beads are deposited with the desired geometry and zero defects. This work aims to evaluate the geometric behavior of weld beads in cladding welding for different welding energy levels and types of electric arc weaving. The FCAW welding process was used with flux-cored tubular wire MIX 38LFC with a diameter of 1.2 mm; welding was carried out in simple deposition on ABNT 1020 steel sheets. The welding energy at four levels, the weave of the arc at four levels and the polarity of the arc were used as influencing variables. As response variables were analyzed: width, penetration, reinforcement, weld bead dilution, ZTA extension and convexity index. The results show that larger widths, reinforcements and ZTAs for coating weld beads can be obtained by increasing the welding energy, but this factor is not dominant when working with different weaves. The same happens with dilution, where lower percentages are achieved with low welding energy. However, for weaving movements, where the torch plays a key role on the sides of the weld bead, the dilution can be reduced with higher energy values. On the other hand, by reducing the welding energy, it is possible to obtain reduced values for penetration and convexity index.