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Soldagem & Inspeção

Print version ISSN 0104-9224

Abstract

FIGUEIREDO, Nathália Cândido et al. Performance evaluation of welding in steel alloy 9Cr-5Mo. Soldag. insp. [online]. 2012, vol.17, n.1, pp.49-57. ISSN 0104-9224.  https://doi.org/10.1590/S0104-92242012000100008.

The development of new steel alloys requires a careful evaluation of their properties as well as its performance against the conditions of operation according to the intended application. Among these properties can be cited the weldability, since in most cases, these alloys are used in the welded condition. The aim of this study was to analyze the effect of GMAW in ferritic alloy containing 5% Mo. Specimens annealed alloy were submitted to automatic GMAW. Three energy levels with different values of current and welding speed were selected, resulting in five welding conditions. The welded samples passed through the characterization of heat-affected regions and the base material through metallographic examination by optical microscopy, SEM and EDX, to determine the effect of welding power in the microstructure. Microhardness tests were performed in order to raise a Vickers hardness profile of the alloy. The results indicated the presence of precipitates identified as martensite. Except for precipitates observed, no other defects, such as the presence of cracks, were observed in specimens welded to the different parameters used.

Keywords : Welding; Molibdenum; Ferritic Steel.

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