压力容器2025，Vol.42Issue(5)：30-37,8.DOI:10.3969/j.issn.1001-4837.2025.05.004
高钢级管线环焊缝应变敏感性评价方法研究
Research on strain sensitivity evaluation method for high-grade pipeline girth welds
摘要
Abstract
To address the safety risks caused by toughness degradation of girth welds after plastic deformation induced by external loads during the service life of buried high-grade pipeline steel,a set of strain sensitivity evaluation methods for girth welds is proposed.This method is based on the ductile-to-brittle transition curve fitted from impact test results of materials at different temperatures,studying the effect of plastic deformation on the transition temperature of welds.Using this method,a comparison is made between girth welds constructed with flux-cored arc welding self-shielded(FCAW-S)consumables,flux-cored arc welding gas-shielded(FCAW-G)consumables,and their matching welding processes,which are commonly used in X80 pipelines.The results show that after 2%deformation,the transition temperature corresponding to an impact absorbed energy of 60 J increases by 44℃for FCAW-S welds,while under the same conditions,the transition temperature for FCAW-G welds increases by only 5℃.In comparison,the toughness of FCAW-S welds is more sensitive to plastic deformation.The research results provide an important basis for the safety assessment of high-grade pipeline girth welds and the selection of consumable and process combinations.关键词
环焊缝/X80管线/脆性断裂/敏感性评价Key words
girth weld/X80 pipeline/brittle fracture/sensitivity evaluation分类
机械制造引用本文复制引用
左勇,尤景泽,孙永辉,王汉奎,宋明,孙立刚,蒲凡,禹婷..高钢级管线环焊缝应变敏感性评价方法研究[J].压力容器,2025,42(5):30-37,8.基金项目
国家石油天然气管网集团有限公司科学研究与技术开发项目(GWHT20240026839) （GWHT20240026839）
微损评价与失效控制学科团队项目(2021XKTD021) （2021XKTD021）
