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- Title
INFLUENCE OF NON-METALLIC INCLUSIONS IN PIPE STEELS OF STRENGTH CLASS X65-X80 ON VALUES OF IMPACT TOUGHNESS OF FLASH-BUTT WELDED JOINTS.
- Authors
KUCHUK-YATSENKO, S. I.; SHVETS, Yu. V.; SHVETS, V. I.
- Abstract
The comprehensive mechanical tests of high-strength steel pipe joints produced using flash-butt welding were carried out. The quality of joints completely meets the requirements of the international standard API STANDARD 1104. During tests on impact bending the single dropouts of KCV-40 values lower than the level required by standards DNV-OS-F101 and STO Gazprom 2-3.7-380-2009 were observed. The decrease in KCV-40 was predetermined by formation of zones of 1-2 mm2 area in the plane of a joint differed by structural heterogeneity, which is characteristic also for base metal and revealed in a sharply distinct anisotropy of its ductile properties. It is shown that the areas with structural heterogeneity do not form colonies, therefore they do not decrease the general serviceability of the welded joint. The sizes of such areas do not exceed the admissible values accepted by the standards for defects of welds made by arc welding. The presence of single local dropouts of KCV-40 values observed during tests of welded joints produced using FBW should not be considered as a sign of rejection.
- Subjects
STEEL pipe; WELDED joints; BUTT welding; ANISOTROPY; HETEROGENEITY
- Publication
Paton Welding Journal, 2014, Issue 12, p2
- ISSN
0957-798X
- Publication type
Article
- DOI
10.15407/tpwj2014.12.01