Aplicação da soldagem TIG com fluxo ativo em um aço inoxidável ferrítico

Abstract

The process of welding TIG with active flux has received a special attention in the last years in function to use conventional equipment with the possibility to get total penetration in only pass in meetings with up to 10 mm of thickness. Better to characterize the effect of this process on the mechanical characteristics of the casting zone of ferríticos stainless steel, this work has as objective to analyze the influence of three types of active flux on the geometry of the weld, on the resistance to the impact (reduced Charpy) of the casting zone and on the microhardness. In this study, the conventional A-TIG technique and one another, where the flux is passed forming two bands in the together one, being called technique of the directed constriction its was applied in the plates of ferrític stainless steel, ASTM 410D, of 6,35 mm, bead on plate. It was analyze the geometry of the weld for each sample. The Charpy test had been carried through in the base metal and the fusion zone. The results had shown that the use of the active flux allows a considerable increase in the weld penetration. The result of the Charpy test in the metal base it was batter in the fusion zone.