Abstract

MENDOZA BRAVO, Ivan; VILLALOBOS VERA, Doris Ivette  and  MALDONADO ZEPEDA, Cuauhtémoc. Hot cracking in welding of ferritic stainless steel AISI 430. Ingenier. mecáni. tecnolog. desarroll [online]. 2015, vol.5, n.3, pp.347-353. ISSN 1665-7381.

Hot cracking in ferritic stainless steel welds, has limited their industrial application despite the good corrosion resistance in aggressive environments and low cost. Generally, the fabrication and joining of components for any application involve the welding processes, for this reason hot cracking must be overcome in order to produce sound welds. The aim of this study was to analyze the relationship between GTAW process and metallurgical phenomenon associated to hot cracking through circular patch test and experimental design relating welding speed and heat input. Results showed the incidence of hot cracking when the material solidifies as straight, long columnar grains due to the high welding speed, promoting a stress concentrator that is also linked to the formation of austenite. On the other hand, at slow welding speed and low heat input curved grains are result of the solidification, which decreased the hot cracking susceptibility.

Keywords : Ferritic stainless steel; hot cracking; martensite; GTAW; CPT.

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