Method for brazing together planar and nonplanar metal members

Patent · Tue Mar 26 04:00:00 EST 1985

OSTI ID:5429507

Hammersand, F G; Witkowski, A J

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/sup 0/ C. per hour until a temperature of 350/sup 0/ 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.

• Assignee: Dept. of Energy
• Patent Number(s): US 4506822
• OSTI ID: 5429507
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
BRAZING
ELEMENTS
FABRICATION
FURNACES
HIGH TEMPERATURE
JOINING
METALS
WELDING