压力容器2025，Vol.42Issue(1)：19-25,7.DOI:10.3969/j.issn.1001-4837.2025.01.003
X80管线钢半自动焊环焊缝强度匹配特征分析
Strength matching analysis of semi-automatic circumferential welds in X80 pipeline steel
摘要
Abstract
To investigate the strength matching characteristics of semi-automatic welded circumferential joints in X80 pipeline steel,this study employs indentation testing,micro-shear testing,and digital image correlation(DIC).The test results indicate significant strength softening in the root weld layer and heat-affected zone(HAZ),where strength values are lower than the base metal,forming weak regions in the circumferential weld system.Based on DIC analysis,under undermatching conditions,initial plastic deformation concentrates in stress concentration zones at the root weld and cap weld toe,followed by strain band propagation along the maximum shear stress direction(45°)which fully penetrates the wall thickness.These findings align closely with the circumferential weld softening model proposed by the pipeline research council international(PRCI),validating its applicability in engineering failure analysis.The study recommends designing circumferential welds with equal or overmatching strength principles and supplementing existing welding procedure qualification systems with advanced characterization methods such as indentation hardness testing,micro-shear strength evaluation,and DIC to enhance strength control accuracy in high-grade pipeline circumferential welds.关键词
X80管线钢/环焊缝/半自动焊/强度匹配Key words
X80 pipeline steel/circumferential weld/semi-automatic welding/strength matching分类
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车荣杰,吕加华,刘宏业,万一鸣,宋卫臣,姚登樽..X80管线钢半自动焊环焊缝强度匹配特征分析[J].压力容器,2025,42(1):19-25,7.基金项目
中国特种设备检测研究院2022重点13"城镇燃气管道安全风险防控关键技术与装备" （）
