Journal
POLISH MARITIME RESEARCH
Volume 24, Issue -, Pages 188-194Publisher
GDANSK UNIV TECHNOLOGY
DOI: 10.1515/pomr-2017-0038
Keywords
underwater welding; wet welding; underwater pipeline; API 5L X65M steel
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This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over an assumed acceptance criterion for welded joints in pipes without anticorrosion polymer insulation, were identified. A significant effect of polimer insulation on structure and properties of welded joints, was found.
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