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石油管道在役焊接修复残余应力特征的分析
Analysis of residual stress characteristics in in-service welding repair of oil pipelines
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- DOI:
- 10.3969/j.issn.1001-2206.2026.02.015
- 作者:
- 张占宇
- 作者单位:
- 大庆油田工程建设公司, 黑龙江大庆 163000
- 关键词:
- 石油管道; 焊接修复; 残余应力; 套袖; 仿真分析
oil pipeline;welding repair;residual stress;sleeve;simulation analysis
- 摘要:
- 为确保石油管道在役焊接修复质量，采用有限元仿真分析技术，建立套袖环缝焊接模型与管道腐蚀模型，研究套袖焊接参数及其应力分布特征，建立了焊接应力影响区与腐蚀应力集中区的量化计算公式。结果表明：焊接热输入量与管道外径对焊接残余应力分布影响较小，套袖壁厚为关键影响因素，外侧压应力影响范围随壁厚增大而扩大，内侧拉应力影响范围稳定在60 mm左右；腐蚀应力集中程度随腐蚀缺陷直径和深度的增大而加剧，增大管道壁厚可减小腐蚀应力影响范围，而增大管径则会扩大其影响范围。在管道修复过程中，根据腐蚀应力集中区与焊接应力影响区的范围合理选择套袖尺寸，对保障焊接修复质量、延长管道服役寿命具有十分重要的意义。
To ensure the quality of in-service welding repair of oil pipelines, finite element simulation analysis technology was employed to establish sleeve girth welding models and pipeline corrosion models. The welding parameters of sleeves and their stress distribution characteristics were studied, and quantitative calculation formulas for the welding stress influence zone and corrosion stress concentration zone were developed. The results indicate that the welding heat input and pipeline outer diameter have minimal impact on residual stress distribution, while the sleeve wall thickness is a critical influencing factor. The influence range of compressive stress on the outer side expands with increasing wall thickness, while the tensile stress influence range remains stable at approximately 60 mm. The degree of corrosion stress concentration intensifies as the diameter and depth of the corrosion area increase. Increasing the pipeline wall thickness can reduce the corrosion stress influence range, while enlarging the pipeline diameter can expand it. During pipeline repair, selecting an appropriate sleeve size based on the extent of corrosion concentration zones and welding stress influence zones is crucial for ensuring welding repair quality and extending the pipeline’s service life.