Caracterização microestrutural de uma junta soldada de baixo teor de carbono obtida através do processo MIG e tendo como parâmetro variável o fluxo e pressão do gás

Abstract

The reality of modern industry is one of constant search for the best processes that guarantee the fulfillment of growing demands, always aligning quality and productivity, as an endless cycle in search of continuous improvement. In the metalworking industry, the welding process becomes crucial and has a great influence on the product. It is a process of joining metals and is carried out from a combination of several parameters. Among the types of welding, the MIG (Metal Inert Gas) welding is one of the most commonly found in the industrial environment due to its versatility, low cost and productivity. For this, inert gas is used to protect the region to be joined, creating a barrier against possible contaminants that negatively influence the quality of the weld. The correct selection of gases and their supply flow will guarantee a process with a minimum of discontinuities. Therefore, this work aims to study the influence of shielding gas flow on MIG welding of low carbon steel boxes for industrial batteries in an industry in the interior of Pernambuco (Brazil). To this end, a comparison of the processes was carried out by varying the gas flow and comparing them from the microstructural characterization and hardness tests. The necessary results are that the use of high gas flow values, not only does not provide more protection, but they become detrimental to the process, acting in an opposite way to what was expected. In addition, a correct selection with the reduction of gas flow conferred, in addition to better quality, a reduction in material consumption and, consequently, lower costs for the process.