Pair of intermediate materials joined by electron beam welding method welds titanium to Rene 41 alloy. Bond is necessary for combining into one structure high strength-to-density ratio titanium fan blades and temperature resistant nickel-base alloy turbine-buckets in VTOL aircraft lift-fan rotor

Scott, R. W.

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High Shear Area Butt Joint
l972.	 B72-10041 
NASA TECH BRIEF 
Ames Research Center 	
_4V 
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Bonding Titanium to Rene 41 Alloy 
Successful welds over small areas have been ob-
tained between titanium and René 41 alloy by the 
use of a pair of intermediate materials joined by the 
electron-beam welding method. Development of this 
and 41 
loss 
'a nad I urn 
ita n I urn 
Joint Line 
bond was made necessary by design requirements of 
the lift-fan rotor for VTOL aircraft, where there is 
need for combining into one structure high strength-
to-density ratio titanium fan blades and temperature-
resistant nickel-base alloy turbine-buckets. 
Initial attempts to weld titanium to Rene' 41 alloy 
directly were unsuccessful, as was also the attempt 
to find a single intermediate material compatible
with both. Eventually, two materials were found that 
formed a compatible "bridge" when welded by an 
electron-beam technique. The series of weldments 
used in a typical butt weld joining René 41 to tita-
nium (Ti-6A1-4V) is indicated in the diagram. Joints 
of this type consistently show ultimate test strength 
values of 40,000 psi (275 MN /M2); most failures 
occur within one hour at the vanadium-to-410 SS 
weld at temperatures of 1000°F (538°C). 
The high shear area butt-joint configuration also 
shown on the diagram has been proposed as a method 
of placing the low-strength annealedvanadium layer 
into shear stress rather than tensile stress to increase 
joint efficiency. 
Note: 
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rected to: 
Technology Utilization Officer 
Ames Research Center 
Moffett Field, California 94035 
Reference: TSP7240041 
Patent status: 
No patent action is contemplated by NASA. 
Source: R. W. Soctt of 
General Electric Company/Aircraft Engine Group 
under contract to 
Ames Research Center 
(ARC-10311) 
Category 08 
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Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
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Bonding titanium to Rene 41 alloy

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