High-strength braze joints between copper and steel are produced by plating the faying surface of the copper with a layer of gold. This reduces porosity in the braze area and strengthens the resultant joint

Kuhn, R. F.

English

NASA Technical Reports Server

June 1967	 Brief 67-10211 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
High-Strength Braze Joints Between Copper and Steel 
The problem: 
To develop a method of producing high-strength 
braze joints between copper and steel. 
The solution: 
Plate the faying surface of the copper to be brazed 
to the steel with a layer of gold having a thickness 
of 0.00005 to 0.0004 inch. Tests have shown that the 
thin gold plating reduces porosity in the braze area to 
.	 a negligible amount, and the strength of the resultant 
joint is above that of the copper itself. 
Notes: 
1. The thickness of the gold plating should not ex-
ceed 0.0004 inch to prevent porosity and a low-
strength brazed joint.
2. Inquiries concerning this invention may be di-
rected to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B67-10211 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546.
Source: R. F. Kuhn
of North American Aviation, Inc.
under contract to
Marshall Space Flight Center
(M-FS-2519) 
Category 05 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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High-strength braze joints between copper and steel

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