Avaliação da microestruta de uma junta dissimilar formada por aço carbono ASTM A36 x aço inox AISI 316 l e comparação com a microestrutura prevista pelo diagrama de Schaeffler

Abstract

The need of the various sectors of industry to produce equipment, piping and welded structures in general more resistant to mechanical efforts and with characteristics special features such as corrosion resistance, high temperature resistance, increased hardness, ductility, boosted the emergence of new materials and consequently the development of new welding techniques. The union known as a Dissimilar joint welding is widely used in several areas, but it can lead to into problems in view of the very different characteristics of the materials involved. Therefore, it is necessary to know the microstructure of the fused zone resulting from the welding of these materials before carrying out the process. There are some tools that can be used to predict the microstructure of the weld region before execute it and one of them is the Schaeffler Diagram. Therefore, in this work it was used this diagram to predict, before welding, the microstructure of a joint dissimilar made of ASTM A36 carbon steel x AISI A316L stainless steel. After In this preliminary step, the specimens were welded using the electrode process. coated, and subjected to laboratory tests (chemical analysis, micrography and measurement percentage of ferrite). With the results obtained, new diagrams were drawn for compare them with the initial prediction and also compare the diagrams with the result measuring the percentage of ferrite found in the molten zone. In the end, although there a small variation, in the percentage of ferrite, between the result obtained by the diagram and measured in the laboratory, it could be concluded that the tool is efficient.