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EFFECT OF STRENGTH MISMATCH OF GIRTH WELD ON SAFETY OF THE WEST-EAST PIPELINE

机译：长度焊缝强度不匹配对西东管道安全的影响

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摘要

The West-East Pipeline is the first of high-pressure, high-grade steel (X70) and large diameter (Φ1016mm) gas transmission pipeline in China. Evidently, Safety of the Pipeline is the most important case that the gas company have to take care of. Previous study showed that strength mismatch of girth weld had great effect on the integrity of the pipeline. Overmatch is preferred for low-grade pipeline (steel grade is usually X60 or lower). As to the high-grade pipeline, in order to reduce the sensitivity of cold crack, hydrogen induced crack (HIC) and stress induced corrosion crack (SCC), etc., under-matched girth weld is recommended somewhere. In this paper, based on a lot of mechanical test results, the effect of different mismatched girth weld on property of the West-East Pipeline is analyzed. The study indicated that mismatch of girth weld has effect on property of the Pipeline, such as limit load, fracture toughness and threshold defect sizes, etc. According to the research results, some advices are presented for design, maintenance and repair of the Pipeline.
机译：西部管道是中国的高压，高档钢（X70）和大直径（φ1016mm）燃气输送管道中的第一个。显然，管道的安全是天然气公司必须照顾的最重要的情况。以前的研究表明，周围焊缝的强度不匹配对管道的完整性有很大影响。低级管道优选跨度（钢级通常为X60或更低）。至于高级管道，为了降低冷裂纹的敏感性，建议在某处建议氢致裂纹（HIC）和应力诱导的腐蚀裂纹（SCC）等。本文基于大量的机械测试结果，分析了不同不匹配的环焊对西部管道的特性的影响。该研究表明，周围焊缝的不匹配对管道的性质有影响，例如限制负荷，断裂韧性和阈值缺陷尺寸等。根据研究结果，提供了一些建议，用于管道的设计，维护和修理。

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