Vol.11, No2, 2011, pp.127-130
 UDC 621.791.923.6:621.833.052

TRIBOLOGICAL ASPECT OF SELECTING FILLER METAL FOR REPAIR SURFACING OF GEARS BY HARDFACING

Svetislav Marković 1, Ljubica Milović 2, Aleksandar Marinković 3, Tatjana Lazović 3

1) Technical College, Čačak, Serbia

2) University of Belgrade, Faculty of Technology and Metallurgy, Serbia

3) University of Belgrade, Faculty of Mechanical Engineering, Serbia

Abstract

Analysis of repaired gears made of case-hardening steel 20MnCr5 by hardfacing method is presented in this paper. Hardfacing repaired gears are tested on the closed power circuit device with variation of the torque value. During testing the wear intensity is measured and the gears’ working life is predicted. Samples made of the same material as the gear are tested on tribometer of the “block-on-disc” type. The gears are repaired in two ways: (1) by hardfacing with filler metal, which is subsequently case-hardened and heat-treated and then mechanically machined, and (2) by hardfacing with filler metal of high hardness (≈ 60 HRC).

Keywords: repair, hardfacing, filler metal, gears

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