The objective of this work was to evaluate a weld support based on fiber glass tissue, having been used a joint welded by the MIG/MAG process of an C-Mn steel with 16 mm thick and a V groove, characteristic of the one-side welding. After the depostition of the root pass over the weld support, the joint was completed by conventional MIG/MAG welding, being evaluated by means of non-destructive and destructive tests (transversal tension, lateral bending and hardness). In addition, optical microscopy and spectroscopy of dispersed energy (SDE) in inclusions of the root pass and the finishing pass. The results show that microsctructure of the weld metal is similar at the root and at the finishing weld bead and typical of ferritic steel weld metal. At he root pass, which was in contact with the fiber glass weld support, there was not observed contamination of fiber glass, both in the bead surface and in the non-mettalic inclusions. The results of mechanical tests (tension, bending and, hardness) were adequate and shown adequability of the fiber glass weld support for the industry of welding manufacturing.
One-sided welding; Weld support; Fiber glas
