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Title: Method for brazing together planar and nonplanar metal members

Abstract

The invention relates to a method and apparatus for brazing two metal members together, at least one of which is nonplanar, in a brazing furnace using a substantially pure brazing material. The method comprises the steps of utilizing a brazing fixture to hold the two metal members in tangential relation to one another along a portion of each member so that a cavity is formed adjacent to the contacting portions. A braze material is then positioned within the cavity. The braze fixture, the metal members, and the braze material are then placed in a brazing furnace. A heat shield is then placed over the braze fixture, the metal members, and the braze material to shield the braze material from direct furnace radiation. The furnace temperature is linearly increased at a rate of about 180.degree. C. per hour until a temperature of 350.degree. C. is achieved. Heat is transferred by conduction from the metal members to the braze material to cause the braze material to melt. Some material from the metal members slowly diffuses into the braze material forming a braze joint. The furnace is rapidly cooled to room temperature using nitrogen gas. The brazed assemblies made according to this methodmore » are superior to assemblies formed by heliarc welding.« less

Inventors:
 [1];  [2]
  1. (East Petersburg, PA)
  2. (Lancaster, PA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865381
Patent Number(s):
4506822
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; brazing; planar; nonplanar; metal; relates; apparatus; furnace; substantially; pure; material; comprises; steps; utilizing; fixture; hold; tangential; relation; portion; cavity; formed; adjacent; contacting; portions; braze; positioned; placed; heat; shield; direct; radiation; temperature; linearly; increased; rate; 180; degree; hour; 350; achieved; transferred; conduction; melt; slowly; diffuses; forming; joint; rapidly; cooled; nitrogen; gas; brazed; assemblies; according; superior; heliarc; welding; planar metal; nitrogen gas; rapidly cooled; furnace temperature; braze material; substantially pure; method comprises; brazing material; heat shield; material forming; method comprise; braze fixture; formed adjacent; tangential relation; rapidly cool; /228/

Citation Formats

Hammersand, Fred G., and Witkowski, Anthony J. Method for brazing together planar and nonplanar metal members. United States: N. p., 1985. Web.
Hammersand, Fred G., & Witkowski, Anthony J. Method for brazing together planar and nonplanar metal members. United States.
Hammersand, Fred G., and Witkowski, Anthony J. Tue . "Method for brazing together planar and nonplanar metal members". United States. https://www.osti.gov/servlets/purl/865381.
@article{osti_865381,
title = {Method for brazing together planar and nonplanar metal members},
author = {Hammersand, Fred G. and Witkowski, Anthony J.},
abstractNote = {The invention relates to a method and apparatus for brazing two metal members together, at least one of which is nonplanar, in a brazing furnace using a substantially pure brazing material. The method comprises the steps of utilizing a brazing fixture to hold the two metal members in tangential relation to one another along a portion of each member so that a cavity is formed adjacent to the contacting portions. A braze material is then positioned within the cavity. The braze fixture, the metal members, and the braze material are then placed in a brazing furnace. A heat shield is then placed over the braze fixture, the metal members, and the braze material to shield the braze material from direct furnace radiation. The furnace temperature is linearly increased at a rate of about 180.degree. C. per hour until a temperature of 350.degree. C. is achieved. Heat is transferred by conduction from the metal members to the braze material to cause the braze material to melt. Some material from the metal members slowly diffuses into the braze material forming a braze joint. The furnace is rapidly cooled to room temperature using nitrogen gas. The brazed assemblies made according to this method are superior to assemblies formed by heliarc welding.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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