Elaboração de uma EPS pré-qualificada para soldagem de uma junta de topo com chanfro em V curvado para o processo MAG em uma empresa no ramo metal mecânico

Abstract

Welding is one of the most used and important processes for joining materials today, mainly due to its high productivity and low cost, also for presenting good mechanical properties. Among the existing processes, the GMAW (Gas Metal Arc Welding - MIG/MAG) is one of the most common due to its relatively easy way to perform it. However, the incorrect parameters use (e.g., welding voltage and current) can lead to defects in the welded structures resulting in low-strength welds. To solve these problems, welding parameters can be standardized for a pre-defined process with welding procedure specifications (WPS) developed based on welding standards parameters or codes. In this framework, this research proposes a pre-qualified WPS for the MAG (Metal Active Gas) process elaboration applied to a butt joint with a flare-V-groove weld. The butt joint at issue is used for equipment manufacturing in a metal-mechanical industry located in Vitorino (city), in Paraná (state), Brazil. The pre-qualified WPS is elaborated to meet the AWS D1.1 - Structural Welding Code for Steel requirements. Welds were performed on specimens of the same geometry and material used in the company, changing the process parameters to obtain the correct parameters and meet the standard. The results obtained were solid as they resulted in the quality welded structures production free of defects.