Abstract:
Ferritic stainless steels, in general, and the first generation of the group 430, in
particular, are associated with many problems during the welding process. These problems
are the grain growth, both in the fusion zone (FZ) and heat affected zone (HAZ) and
martensite formation at grain boundaries of the weld. The grain growth of ferrite at high
temperature and the presence of martensite are that resilience at ambient temperature is
generally low, so that the assembly becomes susceptible to fragile fracture.
The aim of the work is, first to characterize the microstructure of welds steel (AISI 430) as
variable parameters and then optimize its own parameters. We focused on improving
refining the grain size of ferritic stainless steel (AISI 430) during the TIG welding (Tungsten
Inert Gas). The results obtained in the present study show that, the microstructural
characteristics of the weld are influenced by the current and the welding speed and beyond
a critical value of current, speed has no influence
