Metal fusion bonding – Process – With subsequent treating other than heating of bonded parts...
Patent
1982-03-18
1985-03-26
Godici, Nicholas P.
Metal fusion bonding
Process
With subsequent treating other than heating of bonded parts...
228220, 228239, 228246, B23K 2902, B23K 3512
Patent
active
045068224
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 method are superior to assemblies formed by heliarc welding.
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Hammersand Fred G.
Witkowski Anthony J.
Batten, Jr. J. Reed
Carnahan L. E.
Gaither Roger S.
Godici Nicholas P.
Hightower Judson R.
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