INVESTIGATION OF SPOT WELDING CHARACTERISTICS OF TITANIUM ALLOYS
NAVAL AIR ENGINEERING CENTER LAKEHURST NJ AERONAUTICAL MATERIALS LAB
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The fatigue strength of multiple spot welded joints in .060-in.-thick sheet material of the Ti alloys 4Al-3Mo-1V, 16V-2.5Al, and 6Al-4V were determined. The fatigue strength of the 3 alloys was 8-10 of the static strength of the spot welded joint. The alpha-beta alloy 4Al3Mo-1V had the highest fatigue strength the 16V-2.5Al, all beta alloy, the lowest. Data ISALSO PRESENTED ON THE ELEVATED TEMPERATURE STRENGTH OF SPOT WELDS AND THE EFFECT OF EXPOSURE TO ELEVATED TEMPERATURE ON ROOM TEMPERATURE STRENGTH OF SPOT WELDS IN THE 4Al-3Mo-lV alloy. A uniform decrease in shear strength was noted with increase in temperature. At an exposure temperature of 600 F, the 4Al-3Mo- 1V alloy retained its strength up to 250 hr exposure time. A uniform decrease in shear strength occurred after exposure at 900 F for 100 hr, but an anomalous increase in strength occurred after exposure of 1000 hr.
- Metallurgy and Metallography
- Couplers, Fasteners and Joints