基于主曲线法的高钢级管道环焊缝韧性表征

Toughness Characterization of Girth Weld of High Steel Grade Pipeline based on Master Curve Method

为了寻求高钢级管道环焊缝韧性的准确表征试验方法,对现有的冲击韧性与断裂韧性转化关系方法进行了对比分析,明确了不同方法的适用范围和限制条件。开展了X80管线钢半自动焊环焊缝的断裂韧性试验,并采用主曲线法对管线钢环焊缝的韧性进行了表征。结果表明,曲线法能够较好地描述高钢级管道环焊缝韧脆转变区的韧性离散情况,高钢级管道环焊缝可以采用基于主曲线的韧性表征方法。

In order to find an accurate characterization test method for girth weld toughness of high steel grade pipes,the existing transformation relationship between impact toughness and fracture toughness is compared and analyzed,and the applicable scope and limiting conditions of different methods are clarified.The fracture toughness test of semi⁃automatic girth weld of X80 pipeline steel is carried out,and the toughness of girth weld of pipeline steel is characterized by master curve method.The results show that the master curve method can describe the toughness dispersion of the ductile to brittle transition zone of the girth weld of the high steel grade pipeline well,and the toughness characterization method based on the principal curve can be used.