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Napawanie elementów spiekanych

Kozub B.

Technical Issues

2016

nr 2

18--24

Hardfacing (weld surfacing) is one of the methods commonly used for the repair and regeneration of machine parts. It allows, like other welding recovery methods, to repair the damaged part surface in a relatively short time and at low cost. For the purpose of this paper it was attempted to hardface the sintered material made of iron-based MSP powder. The performed tests included microhardness and microstructure analysis of the base and weld material depending on the content of molybdenum in the base material (1.5%, 3.5% and 4 wt.%). Cylindrical samples were uniaxially pressed with pressure of 600 MPa. Sintering process was performed at 1250 °C under pure hydrogen atmosphere. Weld surfacing was performed with MAG (Metal Active Gas) method under gas mixture of argon + CO2, using chromium-molybdenum welding wire.