Detection of diffusion welding defects by thermal NDT of rectifier elements

Journal Article · Sat Dec 31 23:00:00 EST 1983 · Sov. J. Nondestr. Test. (Engl. Transl.); (United States)

OSTI ID:6762296

Bragina, L A; Vavilov, V P; Ivanov, A I; Korolkov, O M; Surzhenkov, G N; Khutorianskii, E D

The possibility was investigated of applying thermal nondestructive testing to rectifying elements, because other methods of NDT (ultrasonic, radiational, electromagnetic, etc.) do not yield positive results in detecting flaws that are typical of diffusion welding. Among the findings, it is noted that optimum results are obtained when the rectifying element is heated on the side of silicon or tungsten, with recording of the radiation on the side of the silicon. The nature of the defects of diffusion welding is such that, no matter which method of heating is used, the defects look cooler on the thermogram. An automatic thermal flaw detector for scrapping defective rectifying elements by the method of thermal NDT is presently devised.

• Research Organization: Nauchno-Issledovatel'skii Institut Introskopii, Tomsk, USSR
• OSTI ID: 6762296
• Journal Information: Sov. J. Nondestr. Test. (Engl. Transl.); (United States), Journal Name: Sov. J. Nondestr. Test. (Engl. Transl.); (United States) Vol. 19; ISSN SJNTA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420500* -- Engineering-- Materials Testing
DEFECTS
DIFFUSION
DIFFUSION WELDING
FABRICATION
HEATING
JOINING
MATERIALS TESTING
NONDESTRUCTIVE TESTING
SEMICONDUCTOR DEVICES
TESTING
THERMAL DIFFUSION
WELDING