Autors: Tashev Р., R. Lazarova., Kandeva, M. K., R. Petrov., V. Manolov.
Title: Tungsten Inert Gas Weld Overlay using Nano-sized TiN Powder
Keywords: TIG, weld overlay, additional wire, nano-modifier, TiN, modi

Abstract: Automated tungsten inert gas (TIG) weld overlay was carried out on plates of low carbon steel S235JR (EN10025) using nano-sized TiN powder coated with Cr (NM). Metallographic studies have been carried out on the microstructure of samples taken from the modified welds, as well as on control samples without nano-modifier. It was found that the use of nano-modifiers refines the average ferrite grain diameter in the welded overlay from 31 μm in unmodified samples to 15 μm in the samples with TiN nano-modifier. The comparison between the microhardness of the zones of the unmodified and modified weld metals showed up to 44% increased hardness in the modified samples. The ways of introducing of the nano-modifiers in the weld were discussed and conclusions are made con-cerning the effect of using nano-modifier on the structure and microhardness on the overlaid weld samples.



    Journal Of The Balkan Tribological Association, vol. 22, issue 3, pp. 2238-2254, 2016, Bulgaria, SciBulCom Ltd., ISBN ISSN: 1310-4772

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