The Paton Welding Journal, 2014, №02



2014 №02 (05)

DOI of Article 10.15407/tpwj2014.02.06

2014 №02 (07)

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The Paton Welding Journal, 2014, #2, 42-46 pages

STRUCTURE AND PROPERTIES OF WELDED JOINTS OF 15Kh1M1FL STEEL AT REPAIR OF CASTING DEFECTS BY TRANSVERSE HILL METHOD

N.G. EFIMENKO¹, O.Yu. ATOZHENKO¹, A.V. VAVILOV², A.G. KANTOR² and E.I. UDALOVA²

¹NTU «Kharkov Polytechnic Institute». 21 Frunze Str., 61002, Kharkov, Ukraine. E-mail: svarka126@ukr.net
²OJSC «Turboatom». 199 Moskovsky Ave., 61037, Kharkov, Ukraine
 
 
Abstract
Welding up casting defects in power equipment components from thermally stable steels involves the risk of brittle fracture as a result of increased volumetric stress state. Studying the influence of technological measures for controlling the thermodeformational welding cycle in order to obtain a favourable structure and properties in welded joints, is of interest. In this work the influence of transverse «hill» welding without preheating or heat treatment on mechanical properties and structure of various zones of welded joints from 15Kh1M1FL steel was studied, and these values were compared with the properties of welded joints after welding with preheating by the standard technology. It is established that after transverse «hill» welding upper granular bainite structure forms in the high-temperature zone of HAZ metal and in the weld metal, which is characterized by an optimum set of mechanical properties, namely a combination of high strength with high enough impact toughness values. It is shown that cold cracking resistance after transverse «hill» welding without preheating is higher than after welding by the standard technology. 12Ref., 6 Figures.
 
 
Keywords: steel, welding, preheating, heat treatment, granular bainite, subgranular structure, properties
 
 
Received:                30.09.13
Published:               28.02.14
 
 
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