Avaliação da influência do reforço de cordão na resistência mecânica da junta soldada pelo processo de soldagem MIG/MAG Uberlândia 2024

Abstract

Often, weld reinforcement is associated with increased mechanical strength of the weld. This study aims to verify whether such an assumption holds true for GMAW welding. To achieve this, butt welds were performed on test pieces cut from a flat bar to ensure lack of penetration, full penetration, and a weld with overfill (reinforcement). The resulting joints underwent tensile testing to assess their mechanical strength. The results indicated that when using a filler metal with mechanical characteristics greater than those of the base metal (as was the case in this study), the fracture of the test piece occurred in the base metal (outside the weld area) for both fully penetrated and reinforced test pieces. This confirms that even if reinforcement increases the mechanical strength of the weld bead, such a contribution is entirely unnecessary in terms of achieving a further increase in the mechanical strength of the welded joint, and it only results in additional unnecessary expenses.