The resistance and fusion weld strengths of United States Steel Corporation 12MoV stainless steel, a modified 12% chromium steel, were determined with sheet material which was heat treated by austenitizing at 185 0 0F., air cooling and tempering at 900 0 F. for 4 hours, and welding. Resistance welded 0.008, 0.016, 0.025 and 0.050 inch thick sheets were generally capable of meeting Specification MIL-W-6858 tensile-shear strength requirements with tensile shear-cross tension ratios of about 0.20 when welded in the full heat treated condition (220,000 psi yield strength). The joint efficiency of fusion welded sheets which were welded in the fully heat treated condition was found to be about 80 per cent.
A number of titanium alloys considered suitable for use in Mach II and III transports were tested for resistance to stress corrosion in the presence of chlorides. These included 4A1-3Mo-1V, 6A1-4V, 8A1-1M0-1V, 5A1-2.5Sn and RS-140. Samples were exposed stressed (smooth and fatigue pre-cracked) at 600, 700 and 800 F (316–427 C) 100 hours for smooth and 50 hours for precracked specimens. Welded and heat-treated specimens were among those tested.
All alloys were found susceptible to stress corrosion cracking. Welding appeared to increase susceptibility, but existing fatigue cracks did not seem to increase susceptibility.
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