INVESTIGATION OF WELDING OF COMMERCIAL COLUMBIUM ALLOYS

Technical Report · Thu Mar 01 04:00:00 EST 1962

OSTI ID:4794219

Gerken, J M; Faulkner, J M

An investigation was made of the welding characteristics of niobium base alloys; FS82, D31, and F48. Tungsten inert gas, electron beam, spot, and flash butt welding methods were investigated. The effect of the welding variables travel speed, shielding gas composition and purity, filler metal additions, preheat, and post heat were studied. Thermal cycles were measured in the fusion zone and heat affected zone of TIG welds to help explain mechanical properties and microstructure of each alloy. The effect of welding on all alloys was to increase the ductile to brittle transition temperature. This temperature was increased 200 deg F for F582, 800 deg F for D31, and 500 to 800 deg F for F48 over that of the as-received wrought sheet. Of several post heat treatments investigated those most beneficial in lowering the transition temperature of welds were; 2000 deg F for 4 hours for F582, 2100 deg F for 24 hours for D31, and 2500 deg F for 4 hours for F48. The electron beam welding process consistently produced more ductile welds than the TIG process. (auth)

• Research Organization: TAPCO. Div. of Thompson Ramo Wooldridge Inc., Cleveland
• NSA Number: NSA-16-030741
• OSTI ID: 4794219
• Report Number(s): ASD-TDR-62-292
• Country of Publication: United States
• Language: English

Related Subjects

BRITTLENESS
DUCTILITY
ELECTRODES
ELECTRON BEAMS
HEAT TREATMENTS
IMPURITIES
INERT GASES
MECHANICAL PROPERTIES
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
TEMPERATURE
TUNGSTEN
VELOCITY
WELDING