Welding Solutions Advancement of High-Strength Pipeline Steels

高强度管线钢焊接解决方案的改进

• 批准号: RGPIN-2017-04368
• 负责人: Nasiri, Ali
• 金额: $ 3.21万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760247
• 关键词: Welding; Solutions; Advancement; Strength; Pipeline

During last two decades, continuously increasing energy delivery rates and the expansion of oil and gas exploration to cold and harsh regions have demanded advancements of the assigned materials and employment of higher strength pipeline steels, such as grade X100 and X120. However, there are significant challenges with conventional arc welding of these high-strength steels, such as heat affected zone (HAZ) softening, cold cracking (Hydrogen-assisted cracking (HAC)), and lack of information on their corrosion behavior in harsh arctic environments. The proposed Discovery grant application will focus on developing welding solutions for advanced high-strength steels and understanding their corrosion behavior in harsh environment with a specific emphasis on API X100 and X120 steels to support the large-scale implementation of the materials in offshore and oil and gas projects. The use of advanced Gas Metal Arc Welding (GMAW) transfer modes, such as Surface Tension Transfer (STT) for the root pass followed by Pulsed (P)-GMAW, will be employed to improve the joint strength and achieve a higher level of reliability and integrity. The unique feature of STT transfer mode is that it offers a combined reduced energy and improved energy control through droplet by droplet control of the fusion zone penetration, which can be beneficial to minimize the extent of HAZ softening and HAC. The key objectives of the proposed work are: (i) evaluate the role of STT/P-GMAW process on microstructure and mechanical properties of X100 and X120 pipeline steels joint; (ii) develop an integrated thermal and microstructural model to simulate the transient heat transfer and microstructure evolution in the fusion zone (FZ) as well as HAZ using a commercial finite element analysis package; (iii) investigate the corrosion behavior of the joints in harsh environment by studying the hydrogen induced cracking (HIC) and sulfide stress cracking (SSC) susceptibility of the joints in H2S/CO2 containing environment. These deliverables will act as a platform for the long-term vision of large-scale utilization of high-strength X100 and X120 steel in offshore and oil and gas industry, particularly in arctic environments leading to a significant investment cost saving. The successful fulfillment of this project will not only develop critical fundamental insight into science and technology of welding and corrosion behavior of high-strength steels, but will improve predictability, integrity, and consistency of the pipeline welding operation. The proposed work will significantly impact dissemination of core research to industry and train five highly qualified personnel (10 counting Co-op students), which will provide a competitive advantage to Canadian offshore and oil and gas industries.

在过去的二十年中，不断提高能源输送率，并将石油和天然气勘探扩展到寒冷和苛刻的区域，要求分配的材料和更高强度管道钢的使用，例如X100和X120级。但是，这些高强度钢的常规电弧焊接面临重大挑战，例如热影响区（HAZ）软化，冷裂（HAC裂解（HAC））以及在恶劣的北极环境中缺乏有关其腐蚀行为的信息。拟议的发现赠款应用程序将着重于开发用于先进的高强度钢的焊接解决方案，并了解其在恶劣环境中的腐蚀行为，并特别强调API X100和X120钢，以支持在海上和石油和天然气项目中大规模实施材料。将使用先进的气体金属电弧焊接（GMAW）传输模式，例如root pass的表面张力转移（STT），然后使用脉冲（P）-Gmaw，以提高关节强度并获得更高的可靠性和完整性。 STT传输模式的独特功能是，它通过液滴控制融合区穿透而通过液滴提供了合并的减少能量，并改善了能量控制，这可能有益于最大程度地减少HAZ软化和HAC的程度。拟议工作的关键目标是：（i）评估STT/P-GMAW过程在X100和X120管道钢接头的微观结构和机械性能中的作用； （ii）开发一个集成的热和微结构模型，以模拟融合区（FZ）中的瞬态传热和微观结构演化以及使用商业有限元分析套件的HAZ； （iii）通过研究氢诱导的裂纹（HIC）和硫化物应力开裂（SSC）在含有H2S/CO2环境中的关节的敏感性，研究了苛刻环境中关节的腐蚀行为。这些可交付成果将充当长期愿景的平台，以大规模利用高强度的X100和X120钢在海上以及石油和天然气行业，尤其​​是在北极环境中，从而可以节省大量投资成本。 该项目的成功实现不仅将发展对高强度钢的焊接和腐蚀行为的科学和技术的重要基本见解，而且还将提高管道焊接操作的可预测性，完整性和一致性。拟议的工作将极大地影响核心研究的传播，并培训五名高素质的人员（10名计数合作社学生），这将为加拿大的海上和石油和天然气行业提供竞争优势。