The study presents the results of the investigations concerning the effect of remelting using
gas tungsten arc welding (GTAW) process on the microstructure and selected properties of
the surface layer in sintered multi-phase steels obtained from powders of 304L and 434L
steels. The effect of surface treatment was evaluated based on macro- and microstructural
observations, EDS analysis, X-ray phase analysis and measurements of surface roughness
and microhardness. It was found that remelting of surface layer leads to elimination of open
porosity and homogenization of the structure, which was confirmed by microscopic observations
and microhardness tests. A cellular or mixed cellular and dendritic structure was
formed in the remelted zone in the sinters. Growth of columnar crystals occurred along the
direction of heat transfer. Using the energy dispersive spectroscopy (EDS), the authors found
higher concentration of alloy elements in the intercellular zones compared to cell cores. Xray
analysis demonstrated that the remelting used is conducive to formation of the
austenitic phase in the remelted material.