Accession Number : AD0873148

Title :   Diffusion Welding of Wrought Beryllium.

Descriptive Note : Technical rept. 1 May 69-15 Mar 70,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA

Personal Author(s) : Bosworth, Thomas J.

Report Date : JUL 1970

Pagination or Media Count : 64

Abstract : The development of a joining process that would produce joints having mechanical properties exceeding 90% of the base metal properties at temperatures up to 800F was the primary objective. It was concluded that lap joints could be made in beryllium sheet containing 1 percent BeO by diffusion welding at 1400F to 1450F in vacuum for 3 hrs. under a welding pressure of 1500 psi with a minimum joint deformation of 5%. The shear strength of welds produced under these conditions was obtained at both room temperature and 800F. Because of the difficulty in conducting shear tests on thin beryllium sheet, the results obtained were erratic and exceeded the program objectives only at the 800F test temperature. It was further concluded that the temperature and deformation must be increased to 1500F and 15 percent minimum, respectively for sheet containing two percent BeO. A further conclusion was that the thickness of the stack being welded can influence the welding parameters if the height is such that barrelling can occur. Restriction of material movement away from the joint should alleviate this problem. (Author)

Descriptors :   *BERYLLIUM), (*PRESSURE WELDING, WELDS, MECHANICAL PROPERTIES, TEMPERATURE, DEFORMATION.

Subject Categories : Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE