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This article provides mention of metallurgy and weldability of 13% Cr-4% Ni steel and the results of experimental welding tests aimed to supporting repair process, using covered electrodes and corresponding filler material, of possible imperfections of forging and / or by mechanical processing, in crates and stator parts of centrifugal compressors, in accordance with ASTM A182. The effects of chemical composition of base material, filler material, as well as post-weld heat treatment (PWHT) on the mechanical properties of welded joints have been investigated, in order to minimize hardness in the fusion zone and heat affected zone. [ABSTRACT FROM AUTHOR]