ULTRASONIC WELDING OF REFRACTORY METALS
Bimonthly progress rept. no. 1
AEROPROJECTS INC WEST CHESTER PA
Pagination or Media Count:
An investigation was initiated to determine the ultrasonic welding machine settings required and to evaluate the properties of welds produced in Nb-10Mo-10Ti and Mo-0.5Ti alloys, and W. The physical and mechanical properties of these materials were tabulated. An empirical formula was used to estimate the minimum electrical energy required to weld each of these materials for welding intervals of 0.2, 0.3, and 0.5 sec. Two methods available for determining the proper clamping force include the weld nugget pullout test and the temperature rise in the weld zone. Preliminary measurements were made of the temperature rise in the weld zone by welding a thermocouple of a coupon of 0.011-in. Mo-0.5 Ti alloy and a no. 40-gage constantan wire with a power level of 1200w applied for 0.6 sec. The optimum clamping force was at or below the 300- to 400-lb. region, which was confirmed by the weld nugget peel test. A sonotrode tip of Astroloy a Ni alloy machined to a 3-in. radius was used.
- Couplers, Fasteners and Joints
- Fabrication Metallurgy