Report details study made of nondestructive radiographic, ultrasonic, thermographic, and leak test methods used to inspect and evaluate the quality of the various brazed joints in liquid-propellant rocket engine components and assemblies. Descriptions of some of the unique equipment and methods developed are included

Adams, C. J.

Hagemaier, D. J.

Meyer, J. A.

English

NASA Technical Reports Server

October 1968	 Brief 68-10394 
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. 
Nondestructive Testing of Brazed Rocket Engine Components 
Liquid-propellant rocket engines are comprised of 
numerous components and assemblies joined by weld-
ing and brazing. Joint quality must be maintained at 
a high level to ensure against fluid leaks and opera-
tional failure. During engine operation, some compo-
nents are at the temperature of liquid hydrogen or 
liquid oxygen, while others are subjected to the high 
temperatures of combustion gases. In addition, the 
components must withstand large static and dynamic 
mechanical loading including vibration stresses. 
A study has been made of nondestructive radio-
graphic, ultrasonic, thermographic, and leak test 
methods used to inspect and evaluate the quality of 
the various brazed joints in liquid-propellant rocket 
engine components and assemblies. Details of this 
study are presented in an illustrated report. The report 
includes descriptions of some unique equipment and 
methods developed for nondestructive testing of com-
plex assemblies. Also included in the report are sum-
mary tables giving the advantages and limitations of 
the various nondestructive test methods for specific 
geometries, material compositions, and joint accessi-
bility. 
Note: 
Copies of the report may be obtained from: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B68-10394 
Patent status: 
No patent action is contemplated by NASA. 
Source: D. J. Hagemaier, C. J. Adams, 
and J. A. Meyer 
of North American Rockwell Corporation 
under contract to 
Marshall Space Flight Center 
(MFS-18191) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Nondestructive testing of brazed rocket engine components

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