摘要
大型的钨钼坩锅壁薄,面积大,检测费时;其壁与底的接口处部位结构复杂,有过度弧面,检测难度高,易漏检。为此采用相控阵超声检测方法,对其壁与底分别采用相控阵超声双晶纵波探头进行检测,对其接口处部位采用相控阵横波探头进行检测。针对坩埚的结构特点,分别设计坩埚壁与底、坩埚接口处2块标准试块,利用2块标准试块进行实验。结果表明,相控阵超声检测技术能对钨钼坩埚内部进行检测,不漏检,满足坩埚内部无损检测要求;与常规超声检测对比,相控超声检测速度快、效率高,不漏检,检测结果直观;利用TOM双晶探头能检测坩埚壁内部直径0.5 mm、埋深6 mm的孔洞缺陷。
Large size tungsten and molybdenum crucible has thin wall and large surface, it needs a long time for inspection. The structure of the interface part between the wall and the bottom is complex, and there is a transition arc surface, which results in high difficulty and negligence during the inspection. So a phased array ultrasonic inspection method by using double crystal longitudinal wave probe for the wall and bottom combined with the transverse wave probe for the interface part was adopted. Aiming at the structural characteristics of the crucible, two types of standard test blocks were designed for the inspection of the wall and bottom, as well as the interface of the crucible, respectively. The results show that the phased array ultrasonic inspection method can detect the defect in the crucible without negligence, thus the requirement of the non-destructive inspection for the crucible inside can be satisfied. Compared with conventional ultrasonic inspection,the phased array ultrasonic inspection method has the characters of high speed, high efficiency, without negligence and visualized result. The TOM double crystal probe can detect the hole defect of 0.5 mm in diameter and 6 mm depth in the wall of the crucible.
出处
《硬质合金》
CAS
2014年第6期361-365,共5页
Cemented Carbides
关键词
相控超声
双晶纵波探头
横波探头
标准试块
phrased array ultrasonic
double crystal longitudinal wave probe
transverse wave probe
standard test block
