Improved diffusion welding technique for TD-NiCr sheet

Journal Article · Thu Nov 01 04:00:00 EST 1973 · Weld. J. (N.Y.), v. 52, no. 11, pp. 515s-523s

OSTI ID:4404307

Holko, K H

An improved diffusion-welding technique was developed to join TD-N-Cr sheet. Compared with results of previous work, this improved technique has the advantages of shonter welding time, lower welding temperature, lower welding pressure (in the most preferred form), and a simpler and more reproducible surfacepreparation procedure. Weldments were made that had base metal creep- rupture shear strength at 1100 deg C of 20 MN/m/sup 2/. Specially processed (unrecrystallized) and commercial TD-NiCr were effectively welded using the improved welding technique. However, the specially processed material was preferred over the commercial material since the weld line could be eliminated, creep-rupture fracture of weldments took place in the base metal away from weld line, and the creep-rupture shear strength of weldments was higher than that of welds made in commercial TD-NiCr. With the commercial TD-NiCr, a semi-continuous weld line resulted and creep-rupture shear fracture took place at this weld line indicating a plane of weakness. Specially processed material was also welded to commercial material with the improved technique. These welds looked very promising and performed similarly to the welds in specially processed material. Previous work resulted in the recommendation that a 600 grit sanded plus electropolished surface preparation be used prior to diffusion welding either specially processed or commercial TD-NiCr. (auth)

• Research Organization: Rohr Industries, Chula Vista, CA
• NSA Number: NSA-29-003010
• OSTI ID: 4404307
• Journal Information: Weld. J. (N.Y.), v. 52, no. 11, pp. 515s-523s, Journal Name: Weld. J. (N.Y.), v. 52, no. 11, pp. 515s-523s; ISSN WEJUA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*TD-NICKEL CHROMIUM-- DIFFUSION WELDING
CREEP
ELECTROPOLISHING
FRACTURES
N50120* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Preparation & Fabrication
RUPTURES
SHEAR PROPERTIES
SURFACE TREATMENTS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
WELDED JOINTS