EVALUATION OF ELECTRON BEAM WELDING FOR FABRICATION OF ULTRA HIGH STRENGTH STEEL ROCKET MOTOR CASES
Monthly status rept. no. 11, 1-31 Mar 61.
MASSACHUSETTS INST OF TECH CAMBRIDGE DIV OF SPONSORED RESEARCH
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Tensile and tensile impact properties are tabulated for electron-beam welded H-11 steel with a variety of post-weld heat treatments. Fracture occurred outside the weld zone in more than half the specimens. Decreasing the tempering temperature caused an increase in both the strength and ductility. Electron beam re-fusion of arc welds resulted in transverse properties comparable to those obtained by electron beam welding gun with a transmission of 90 under vacuum welding conditions. By correlating hardness and peak temperature distributions, the minimum hardness in the heat-affected zone corresponded to a temperature between l350 and l400 F. The magnitude of the minimum hardness was sensitive to the heat treatment of the material prior to welding the lower the prior tempering temperature, the less was the softening effect.