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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-scale tungsten-molybdenum crucible wall thin, large area, testing time-consuming; the wall at the end of the interface at the site structure is complex, with excessive cambered surface, high detection difficulty, easy to missed inspection. To this end phased array ultrasonic testing method, respectively, the wall and the end were phased array ultrasonic dual-crystal longitudinal wave probe detection, its interface at the site by phased array shear wave probe for detection. According to the structural characteristics of the crucible, two standard test blocks were designed respectively at the crucible wall and the bottom and the crucible interface, and two standard test blocks were used for experiments. The results show that phased array ultrasonic testing can detect the interior of the tungsten-molybdenum crucible without missing inspection, and meet the requirements of non-destructive testing inside the crucible. Compared with the conventional ultrasonic testing, the phased ultrasonic testing has the advantages of fast detection, high efficiency, The result is intuitive. The hole defect with diameter of 0.5 mm and depth of 6 mm can be detected by TOM twin crystal probe.