Mechanical and metallurgical implications of non-ideal geometry in circumferential pipeline welds

本研究和培训项目的重点是开发一个模型来预测非理想接头几何形状的管道焊缝的根部缺陷。由于各种不可避免的原因，包括管道尺寸的制造公差和焊接过程中焊接接头的热变形，存在与理想接头几何形状的偏差。为了解决这些问题，工业从业者严重依赖历史经验和现有的指导方针，这些指导方针的科学基础有限，适用范围未知。该项目将首次以科学和系统的方式研究根部缺陷与关节几何形状变化之间的机制。该方法将在很大程度上依赖于阿尔伯塔大学加拿大焊接和连接中心的实验设备和数学建模专业知识。该提案将涉及培训三名硕士和六名本科生。实验技术、计算焊接建模和先进的分析技术将被共同利用，以指导适用于非理想焊接接头的广义模型的发展。该项目的结果将立即用于合作伙伴公司（Enbridge），并将为所有加拿大管道运营商和制造商提供必要的信息和知识，以便每次都能第一次生产出高质量、可靠和经济的焊接接头。

This research and training project focuses on developing a model to predict root defects in pipeline welds with non-ideal joint geometry. Deviations from ideal joint geometry exist due to a variety of unavoidable causes including manufacturing tolerances on pipe dimensions and thermal distortion of the weld joint during the welding process. To address these concerns, industrial practitioners rely heavily on historical experience and established guidelines with limited scientific basis and an unknown range of applicability. This project will study, for the first time in a scientific and systematic way, the mechanisms that relate root defects to variation in joint geometry. The approach will rely heavily on the experimental equipment and mathematical modelling expertise at the Canadian Centre for Welding and Joining at the University of Alberta. The proposal will involve the training of three MSc and six undergraduate students. Experimental techniques, computational weld modelling, and advanced analysis techniques will be utilized together to guide the development of a generalized model applicable to non-ideal welded joints. The results of the project will be of immediate use to the partner company (Enbridge), and will provide all Canadian pipeline operators and fabricators with the information and knowledge necessary to produce high quality, reliable, and economical welded joints the first time, every time.