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油气管道差异壁厚焊缝应力集中特性研究
Stress concentration characteristics at welds with differential wall thicknesses in oil and gas pipelines
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- DOI:
- 作者:
- 马兆亮
Ma Zhaoliang
- 作者单位:
- 大庆油田工程建设有限公司，黑龙江大庆 163000
- 关键词:
- 油气管道；管道壁厚；焊缝；应力集中；仿真分析
oil and gas pipelines; pipeline wall thickness; weld; stress concentration; simulation analysis
- 摘要:
- 在两种不同壁厚（差异壁厚）油气管道焊接过程中，焊缝应力集中问题突出，极易发生开裂，已成为
威胁在役管道本质安全运行的重要隐患。建立基于多点线性插值法和模拟仿真分析技术的油气管道差异壁厚焊
接应力计算模型，对不同焊接参数下的焊缝应力集中问题进行系统性研究，并总结其影响规律。研究结果表
明，差异壁厚管道焊缝应力集中影响系数与V形焊接坡口角度、焊接后焊缝余高、管道接口切削角度、管道壁
厚比值均呈正相关，且影响程度依次递增。研究成果可为油气管道日常巡检、风险分级及维修决策提供数据与
理论支撑，进而提升在役管道的本质安全水平。
During the welding process of oil and gas pipelines with two different wall thicknesses (differential wall thicknesses), stress concentration issues are prominent, and cracks are prone to occur at welds, which becomes a critical factor affecting the intrinsic safety of pipeline operation. This paper builds a welding stress calculation model for oil and gas pipelines with differential wall thicknesses based on the multi-point linear interpolation method and simulation analysis technology. Meanwhile, it carries out systematic research on stress concentration issues under various welding parameters and summarizes the influencing patterns. The research findings indicate that the stress concentration influence coefficient at the welds of pipelines with differential wall thicknesses positively correlates with the angle of the “V” groove, weld height after welding, cutting angle at pipeline connections, and ratio of the two pipeline wall thicknesses, with the gradually increasing influence degree. The research results can provide a data basis and theoretical support for daily inspections, risk classification, and maintenance decision-making of oil and gas pipelines, thereby enhancing the intrinsic safety of in-service pipelines.