Influence of welding material strength on strain capacity of girth welds in high-grade steel pipelines

Yue YANG; Hong ZHANG; Xiaoben LIU; Kai WU; Yongli SUI; Die YANG

doi:10.6047/j.issn.1000-8241.2022.01.007

You-qi chuyun (Jan 2022)

Influence of welding material strength on strain capacity of girth welds in high-grade steel pipelines

Yue YANG,
Hong ZHANG,
Xiaoben LIU,
Kai WU,
Yongli SUI,
Die YANG

Affiliations

Yue YANG: College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Hong ZHANG: College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Xiaoben LIU: College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Kai WU: College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing)//National Engineering Laboratory for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
Yongli SUI: China Petroleum Pipeline Research Institute Co. Ltd.//National Engineering Laboratory for Pipeline Safety
Die YANG: China Petroleum Pipeline Research Institute Co. Ltd.//National Engineering Laboratory for Pipeline Safety

DOI: https://doi.org/10.6047/j.issn.1000-8241.2022.01.007
Journal volume & issue: Vol. 41, no. 1
pp. 48 – 54

Abstract

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In order to evaluate the influence of the strength of base material, root welding material and filler material on the strain capacity of girth welds in X80 pipeline, the passivation behavior of crack tips during cracking was accurately simulated with the Key Hole model by the nonlinear finite element method based on the China–Russia Eastern Gas Pipeline with a diameter of 1 422 mm and a wall thickness of 21.4 mm. Here, consideration was given to the complete geometrical morphology of welded joints and the partition of four materials with different properties. In addition, the crack initiation behavior of circumferential cracks in the root inner surface under the action of tensile load was researched. According to the results, the strength of root welding material has little impact on the overall strain capacity of double V-groove welded joint, which can be ignored. The overmatching of filler material with the base material is the most important to guarantee the strain capacity in the weld zone. Moreover, in the case that it is difficult to enhance the strength of filler material, limiting the strength indicator of base material is an effective way to improve the strain capacity of welded joints in high-grade steel pipelines.

Published in You-qi chuyun

ISSN: 1000-8241 (Print)
Publisher: Editorial Office of Oil & Gas Storage and Transportation
Country of publisher: China
LCC subjects: Technology: Chemical technology: Oils, fats, and waxes; Technology: Chemical technology: Gas industry
Website: https://yqcy.paperonce.org/en/

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