摘要
对某中厚板球罐焊接接头进行衍射时差法超声检测(TOFD)中发现大量密集显示点状缺陷,排除焊接原因后,通过取样进行低倍检测、金相组织检验分析,确认TOFD图谱显示与母材中存在的条状MnS夹杂物,聚集态的含Nb、Ti的氮化物夹杂物有关,二者大量存在对接头焊接质量产生直接影响。通过调整扫查方式对缺陷位置进行确认,为TOFD检出缺陷的识别与判定提供借鉴。
A large number of punctate defects were found in a welded joint of a medium and heavy plate spherical tank by ultrasonic time of flight diffraction technique(TOFD).After the welding cause was excluded,an analysis of low-magnification detection and metallographic inspection was conducted using sampling techniques.This revealed that the defects found by TOFD were related to the presence of MnS inclusions in the base metal and nitride inclusions containing Nb and Ti in the aggregate state.The high number of inclusions had a direct impact on the quality of the welding.Verification of the location of defects through adjustment of the scanning method provides a basis for the identification and assessment of defects detected by TOFD.
作者
张向英
金彦枫
何谞
杨艳龙
刘泉
白家欣
侯彦华
胡金奎
ZHANG Xiang-ying;JIN Yan-feng;HE Xu;YANG Yan-long;LIU Quan;BAI Jia-xin;HOU Yan-hua;HU Jin-kui(Lanpec Technologies Limited,Lanzhou 730070,China)
出处
《石油化工设备》
CAS
2024年第6期61-65,共5页
Petro-Chemical Equipment
关键词
球罐
衍射时差法超声检测
夹杂物
缺陷
判别
spherical tank
ultrasonic time of flight diffraction technique
inclusion
defect
identification
