ABSTRACT The objective of this study was to investigate the weldability of an iron-based powder metal alloy
(Fe-P-C) using the gas tungsten arc welding process (GTAW) with two different filler metals.
Optical microscopy revealed that for the Fe-P-C alloys, the fusion-welded zone was free of
porosity and cracks. The thickness of the slab was 4 mm. The heat affected zone did not show
excessive hardness. The SEM image of the fracture specimen showed elongated dimples. X-Ray
mapping confirmed the absence of Fe3P. EPMA was used to determine the ability of carbon in
preventing the segregation of P to the grain boundaries. Tensile tests showed that the failures of
the specimens occurred always in the base metal with tensile strength slightly superior to the
value of unwelded samples. As a result, this investigation showed the feasibility of joining ironbased
powder metal alloys by the GTAW process, especially while welding the Fe-P-C alloy.
Cite this paper
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