Accession Number : AD0286283

Title :   MATERIAL - VASCOJET 1000 FLASHWELDED - EVALUATION OF

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : HILDEBRAND,JOHN F.

Report Date : 28 SEP 1962

Pagination or Media Count : 1

Abstract : The object of this investigation was to determine the tensile and axial tension-tension fatigue properties of flashwelded joints in Vascojet 1000 plate heat treated to an ultimate tensile strength between 260,000 and 280,000 psi. Thirtyeight test coupons, .250 x 3 x 10 inches, were flashwelded. The flashwelds were generally of poor quality in that the weld centerline failures exhibited flatspots. The upset zone of the flashwelded joints was the weakest zone in 21 out of 31 specimens. Upset stringers and grain coarsening, in part, account for the lower fatigue strength of the joints. The notch sensitivity was reduced and the fatigue strength at high stress levels improved by drawing the joints to a lower strength level. The endurance limit of the joints tested was between 0,000 and 60,000 psi at a stress ratio of R = 0.1 and at the 260,000 to 290,000 psi strength level. The tensile strength joint efficiency averaged about 66%. The magnaflux inspection revealed some of the weld defects. (Author)

Descriptors :   *STEEL, *WELDS, CHROMIUM ALLOYS, ELEVONS, FATIGUE (MECHANICS), HEAT TREATMENT, MOLYBDENUM ALLOYS, TENSILE PROPERTIES, TEST METHODS, VANADIUM ALLOYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE