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EVALUATION OF ELECTRON BEAM WELDING FOR FABRICATION OF ULTRA HIGH STRENGTH STEEL ROCKET MOTOR CASES
Monthly status rept. no. 12, 1-30 Apr 61
MASSACHUSETTS INST OF TECH CAMBRIDGE DIV OF SPONSORED RESEARCH
Pagination or Media Count:
Further determinations were made of the ultimate t nsile strength, yield strength, and bi-axial tensile strength of electron beam and tungsten inert gas TIG welds. The magnitude of the strengtheni g effect is expressed as a percentage of the uni-axial ultimate tensile strength. InALL OF THE TIG welded uni-axial tensile specimens, fracture took place within the weld metal or heat-affected zone so that the magnitudes of bi-axial strengthening were characteristic of the weld metal. A comparison of the results obtained with the uni-axial and bi-axial electron beam welded test specimens show a strength increas between 20 and 30 fracture of electron beam weldments rarely took place in the weld. A comparison of uni-axial and bi-axial strengths indicates that electron beam weld metal is at least as strong as the base material and is somewhat trong r than TIG weld metal. Electron beam weld metal is very responsive to the strengthening effects of bi-axial loading, probably because of the near absence of micro-flaws in a rapidly solidified vacuum deposited structure. Author
APPROVED FOR PUBLIC RELEASE