Estudo para qualificação de procedimento de soldagem de revestimento em aço carbono utilizando monel como metal de adição

Abstract

It is common in the petrochemical industry to use equipment and accessories for carbon steel with application of anti-corrosive coating based on nickel alloys. It turns out that this practice is widely used in the construction and assembly of equipment. new ones, there is not much research on this procedure applied to field maintenance and repair for some specific equipment. This article seeks evaluate the quality of a skin weld on a carbon steel substrate with addition of monel metal seeking anti-corrosion protection, simulating welding field repair. For this purpose, test specimens were made and welding was carried out using the coated electrode technique. Procedures were carried out as recommended in the ASME IX code, such as inspections, tests not destructive tests and mechanical bending tests. Furthermore, the chemical analysis tests, optical microscopy and Vickers microhardness with the purpose to characterize the post-welding material. In this way data were obtained where it was possible to see that the application and replacement of this coating in the field can maintain reliability and safety like new equipment, as well as an RQPS and later EPS can be designed for this type of welding.