Comparação de processos de solda no dimensionamento estrutural de serpentinas externas em tanques de aço inoxidável

Abstract

Modern industry is highly dependent on the type of equipment called a pressure vessel, the possible applications are quite extensive. The ASME BPVC code, section VIII governs the design of pressure vessels, standardizing their sizing and construction, in order to guarantee safety, without giving up their productivity. In these processes, heat exchange systems are also used on a large scale, the code does not cover all of them. This work as a calculation methodology of division 1 of the ASME code, section VIII, 2019 edition for dimensioning the external heat exchanger coil, corroborating the test method of the 2019 edition of the ASME BPVC section IX code, and through the extraction of metallographic tests. and designed as assessment and test execution methodologies, in order to develop the tests and assessment as. Tests were determined with the specimens with the GMAW and GTAW processes in order to obtain the admissible test stress, they were used to replace the established values in the code, the hydrostatic test was well succeeded, increasing the pressure, fabrication specimens with GMAW bodies failed by welding crack and GTAW specimens by plastic deformation. Metallography showed that none of the welds achieved penetration greater than 50% of the sheet thickness and that the GTAW process alters the material's microstructure more than the GMAW process, due to the higher application of heat, increasing the size of the thermally affected zone and the grains present in it, causing the elongation of the specimens produced with GTAW welding to have 18.5% greater elongation. It is concluded that the GTAW process is more suitable due to its greater tenacity. [resumo fornecido pelo autor]