The Paton Welding Journal, 2013, №01



2013 №01 (02)

2013 №01 (04)

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The Paton Welding Journal, 2013, #1, 11-13 pages  

DEVELOPMENT OF FLUX-CORED WIRE OF THE FERRITIC GRADE FOR SURFACING OF HIGH-CARBON STEEL PARTS

Ya.P. CHERNYAK

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The issue of current importance is reconditioning of parts with a carbon content of more than 0.5 %. Traditional methods for crack control, such as preliminary and concurrent heating, in surfacing of parts made from high-carbon steels are not always possible to apply, because of a large weight of the parts or economic inexpediency. The investigation results presented in the article allowed the development of a new surfacing consumable of the ferritic grade, which provides the defect-free deposited layer when using no preliminary and concurrent heating. The key element of the Fe-Ti-Mn-Si-Mo alloying system is titanium. Considering its affinity for carbon and stoichiometric ratio, this made it possible to produce a soft ferritic matrix in the deposited layer, the content of carbon in the base metal being up to 1 %. The positive result of experimental-industrial verification of the developed flux-cored wire in surfacing of tram rails made from steel M76 with a carbon content of up to 0.8 % permitted recommending this wire for commercial application. Specifications of Ukraine TUU 28.7.05416923.066-2002 were worked out for commercial manufacture of wire PP-Np-06T3GM (PP-AN203). Ferritic flux-cored wire PP-Np-T3SGM provides the absence of all types of cracks in the deposited metal and HAZ, including spalls, within a wide range of surfacing parameters. It is recommended for application in surfacing of parts made from high-carbon steels without preliminary and concurrent heating. 4 Ref., 2 Tables, 3 Figures.
 
 
Keywords: arc surfacing, surfacing consumables, high-carbon steels, flux-cored wire, ferritic deposited metal, preliminary and concurrent heating
 
 
Received:                11.07.12
Published:               28.01.12
 
 
References
1. Frumin, I.I. (1961) Automatic electric arc surfacing. Kharkov: Metallurgizdat.
2. Chernyak, Ya.P., Bursky, G.V., Kalensky, V.K. (2002) Resistance of the HAZ metal of steel M76 to cold cracking after surfacing using ferritic grade wires. The Paton Welding J., 11, 39-40.
3. Vasiliev, V.G., Malevsky, Yu.B. (1981) Dilatometer for examination of phase transformations in welding thermal cycle. In: Physical methods of examination of metals. Kiev: Naukova Dumka.
4. Vasiliev, V.G., Malevsky, Yu.B. (1965) Dilatometer for measuring of elongation in cross section of specimen. In: Machines and devices for testing of metals and plastics materials. Moscow: Mashgiz.

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