Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Influence of mixing variation on the macro and microstructure of 316L-Si stainless steel deposits obtained by GMAW
Submission Author:
Anderson Eduardo De Salles Oliveira , PB
Co-Authors:
Anderson Eduardo De Salles Oliveira, Raquel Calado, Joyce Ingrid Venceslau de Souto, Jefferson Segundo de Lima
Presenter: Anderson Eduardo De Salles Oliveira
doi://10.26678/ABCM.COBEM2023.COB2023-1180
Abstract
Welding is one of the oldest joining methods in industry and one that is likely to last a long time, due to its wide application and functionality. Consequently, metallurgical processes are always being studied, with the GMAW, or MIG/MAG, welding process standing out because of its high productivity. One of the most effective applications of GMAW is in coating welding, which allows the transfer of superior properties from noble alloys to more common and lower cost materials. In line with this process for coatings, austenitic stainless steel alloys are widely applied, such as AISI 316L-Si, due to its higher corrosion resistance and good workability. It is worth mentioning that besides the observance of the process and the steel to be used, it is even more fundamental the analysis of the welding parameters that influence not only the geometry, quality and microstructure of the weld, but also the formation of the heat affected zone (HAZ) and the final mechanical properties. Therefore, the present study aims to evaluate the influence of welding speed variation on the geometrical and microstructural characteristics of 316L-Si austenitic stainless steel deposits obtained by GMAW. To perform this experimental analysis, a survey of the bibliography was done, and later, the samples were made. The variation was of only one parameter (welding speed), in which the other parameters were kept constant, choosing in the literature those that promoted better results. In the different samples, the geometrical characteristics, time evolution of voltage and current, as well as the grain size in the melted regions and HAZ were analyzed. The hardness profile traced remained with constant values in one of the samples, even in coarse-grained regions, while the other sample obtained a hardness peak in this same region. In addition, the sample with the lower speed, 250 (mm/min), presented lower values of dilution, height, and width in the depositions, despite having a higher thermal input. The sample with the highest speed, 350 (mm/min), showed higher dilution values, with a wider HAZ. Factors such as the level of deposition and penetration also proved essential to the understanding of the results. Therefore, from what was obtained it is observed that a small variation in speed generated significant changes in the characteristics and properties of the final structure. Showing how important the experimental analysis of welding is, whether in research or in industry.
Keywords
Influence, parameter range, properties
