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超临界CO2 输送管道全自动焊接工艺研究
Research on automatic welding process for supercritical CO? transmission pipelines
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- DOI:
- 作者:
- 牛益民，王营，武文辉，胡利锋，姚子健，王思明
- 作者单位:
- 1.廊坊中油朗威工程项目管理有限公司，河北廊坊 065000 2.石油天然气管道工程质量监督站，河北廊坊 065000 3.昆仑信息科技（廊坊）有限公司，河北廊坊 065000
- 关键词:
- CO₂输送管道；全自动焊接；超临界工况；焊接工艺评定
CO2 transmission pipeline; automatic welding; supercritical condition; welding procedure qualification
- 摘要:
- 以吉林石化—吉林油田超临界CO2
输送管道工程为背景，针对输送介质强腐蚀性、高密度及易相变的
特性，系统开展全自动焊接工艺优化研究。通过深入分析超临界CO₂介质特性对焊接接头性能的影响机制，优
化筛选出L450M管材与低氢型焊丝（W49A4UZ6、G49A4UM21ZS6）的匹配体系，创新设计U型坡口结构，
并精准调控 GTAW+GMAW 复合自动化焊接工艺参数。基于该项目的焊接工艺评定试验，系统验证了GTAW
+ GMAW复合自动化焊接工艺的技术可行性与工程适配性。研究结果表明：焊接接头抗拉强度≥539 MPa，-40 ℃冲击功均值达190 J以上，韧脆转变温度低于-45 ℃，各项性能指标均满足GB/T 31032—2023《钢质
管道焊接及验收》及工程设计文件要求。本研究可为超临界CO₂输送管道的高效优质焊接提供针对性技术方
案，对保障管道运行安全、推动减排技术规模化应用具有重要意义。
Against the background of the supercritical CO2 transmission pipeline project between Jilin Petrochemical and Jilin Oilfield, in view of the special operating conditions of the supercritical CO2 medium (i.e., strong corrosiveness, high density, and easy phase transition), a systematic optimization study on the automatic welding process was carried out. By deeply analyzing the influence mechanism of supercritical CO2 medium characteristics on welded joint performance, the matching system of L450M pipe and low hydrogen welding wires (W49A4UZ6 and G49A4UM21ZS6) was optimally selected; an innovative U-shaped groove was designed, and the process parameters of the combined GTAW + GMAW automatic welding process were precisely controlled. Based on the welding procedure qualification tests of the project, the technical feasibility and engineering adaptability of the GTAW + GMAW automatic welding process were systematically verified. The results show that the tensile strength of the welded joints is ≥539 MPa; the average impact energy at −40 °C exceeds 190 J, and the ductile-brittle transition temperature is lower than −45 ℃. All performance indicators meet the requirements of GB/T 31032—2023 Welding and Acceptance of Steel Pipelines and engineering design documents. This study can provide a targeted technical solution for the efficient and high-quality welding of supercritical CO2 transmission pipelines and is of great significance for ensuring the safe operation of pipelines and promoting the large-scale application of emission reduction technologies.