The Paton Welding Journal, 2012, №05



2012 №05 (11)

2012 №05 (02)

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The Paton Welding Journal, 2012, #5, 2-7 pages  

FLASH-BUTT WELDING OF THICK-WALLED PIPES FROM HIGH-STRENGTH STEELS OF K56 STRENGTH CLASS

S.I. KUCHUK-YATSENKO¹, Yu.V. SHVETS¹, V.F. ZAGADARCHUK¹, V.I. SHVETS¹, V.I. KHOMENKO², S.I. ZHURAVLYOV², A.Ya. SUDARKIN², V.L. KOLIKOV³, S.A. KHOMICHENKO³

¹E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
²CJSC «Pskovelektrosvar», Pskov, RF
³OJSC «Mezhregiontruboprovodstroj», Moscow, RF
 
 
Abstract
Technology was developed for flash-butt welding of 1219 mm diameter pipes with 27 mm wall thickness from 10G2FB steel of strength class K56, designed for construction of off-shore gas pipelines. Admissible limits of variation of the main welding parameters ensuring the required quality of welded joints were determined. Required level of mechanical properties of the joints is achieved by local postweld high-temperature heat treatment in combination with accelerated cooling.
 
 
Keywords: flash-butt welding, pipelines, high-strength steel, normative requirements, weldability, welding mode, welding mode parameters, welding process programming, flashing process, set power, mechanical testing, reject indications, heat-affected zone, joint quality, heat treatment, microstructure, grain, ultimate tensile, strength, impact toughness
 
 
Received:                07.03.12
Published:               28.05.12
 
 
References
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2. STO 2-3.7-380-2009: Manual on welding technology of sea off-shore pipelines. Introd. 2009.
3. DNV-OS-F101: Offshore standard. Submarine pipeline systems. Jan. 2000.
4. Kuchuk-Yatsenko, S.I. (1992) Flash-butt welding. Kiev: Naukova Dumka.
5. Kuchuk-Yatsenko, S.I., Mosendz, I.N., Kazymov, B.I. (1987) Programming of parameters of flash-butt welding with large developed sections. Avtomatich. Svarka, 6, 14-18.
6. Kuchuk-Yatsenko, S.I., Lebedev, V.K. (1976) Continuous flash-butt welding. Kiev: Naukova Dumka.
7. Kuchuk-Yatsenko, S.I., Krivenko, V.G., Sakharnov, V.A. et al. (1986) Resistance butt welding of pipelines. Kiev: Naukova Dumka.
8. Lebedev, V.K., Skulsky, Yu.V., Kuchuk-Yatsenko, S.I. et al. (1977) Local heat treatment of welded joints of 1420 mm diameter gas pipes. Avtomatich. Svarka, 10, 38-40.

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