摘要
对接环焊缝的强度在高钢级管线中起重要作用。本文利用仪器化压痕法、常规拉伸试验法和维氏硬度法对X80的环焊缝、热影响区以及母材的材料性能进行测试,并比较仪器化压痕法和常规拉伸试验方法获得的强度结果。测试结果表明,仪器化压痕法可以给出对接环焊缝的屈服强度、抗拉强度,仪器化压痕法可以正确反映管线的焊缝与母材的匹配关系,还可以获得焊缝热影响区等更加精细的强度分布。通过对环焊缝进行常规拉伸与仪器化压痕法测得的强度对比发现,上游母材、焊缝中心及下游母材的屈服强度误差分别为6%、6.5%、7.5%,抗拉强度误差分别为16%、5.5%、3%。仪器化压痕法测得屈服强度基本低于常规拉伸的屈服强度,测得抗拉强度高于常规拉伸的抗拉强度。但仪器化压痕法测试结果与常规拉伸试验结果的规律一致,即母材强度大于环焊缝中心强度且上游母材强度低于下游母材。
The strength of butt girth weld plays an important role in high steel pipeline.In this paper,the material properties of X80 girth weld,heat affected zone and base metal were tested by instrumented indentation method,conventional tensile test method and Vickers hardness method,and the strength results obtained by instrumented indentation method and conventional tensile test method were compared.The test results show that the instrumented indentation method can give the yield strength and tensile strength of the butt girth weld,and the instrumented indentation method can correctly reflect the matching relationship between the weld and the base material of the pipeline,and can also obtain the more refined strength distribution of the weld heat affected zone.The yield strength errors of the upstream base metal,the weld center and the downstream base metal were 6%,6.5% and 7.5%,and the tensile strength errors were 16%,5.5% and 3%,respectively.The yield strength measured by instrumented indentation method is basically lower than that of conventional tensile,and the tensile strength measured by instrumented indentation method is higher than that of conventional tensile.However,the instrumented indentation test results are consistent with the conventional tensile test results,that is,the base metal strength is greater than the girth weld center strength and the upstream base metal strength is lower than the downstream base metal strength.
作者
孙永辉
周天宇
刘凯
柳旺
尤景泽
王汉奎
Sun Yonghui;Zhou Tianyu;Liu Kai;Liu Wang;You Jingze;Wang Hankui(China Special Equipment Inspection&Research Institute,Beijing 100029)
出处
《中国特种设备安全》
2023年第S02期86-89,92,共5页
China Special Equipment Safety
关键词
高钢级管线
对接环焊缝
匹配关系
仪器化压痕法
High steel pipeline
Butt girth weld
Matching relation
Instrumented indentation method
