Teflon sleeve insert prevents contamination of internal tube surfaces by solder compound during soldering operations that connect and seal the tube ends. The sleeve insert is pressed into the mating tube ends with a slight interference fit

Stein, J.

English

NASA Technical Reports Server

/ 4.28 IWO V-- — 
June 1966
	
Brief 66-10238 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Insert Sleeve Prevents Tube Soldering Contamination 
The problem: 
To prevent contamination of internal tube surfiés 
by solder compound during soldering operations that 
connect and seal the tube ends. 
The solution: 
ATeflon sleeve insert pressed into the mating Loe 
ends with a slight interference fit. 
How it's done: 
Teflon is relatively inert, impervious to most chemi-
cal liquids and gases, and has a melting temperature 
above that reached during soldering. The Teflon is 
machined into a sleeve configuration that includes 
a center external shoulder to position the sleeve be-
tween the tube ends and prevent system fluids from 
moving the sleeve away from the joint area. 
The sleeve is forced into the two ends of the tubes 
to be connected before the soldering operation begins. 
The sleeve, if deformed during installation, will tend
to reform to the original configuration during solder 
heating, thereby improving seal effectiveness. 
Notes: 
1. Material used is bar tetrafluoroethylene, stress 
relieved at 500'F for 2 hours. 
2. Inquiries cncerning this innovation may be di-
rected to:
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas, 77058 
Reference: B66-10238 
Patent status: 
No patent action is contemplated by NASA; 
Source: John Stein 
of North American Aviation, Inc. 
under contract to 
Manned Spacecraft Center 
(MSC-552) 
Category 05 
Adk
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.
https://ntrs.nasa.gov/search.jsp?R=19660000237 2020-03-11T17:32:12+00:00Z


Insert sleeve prevents tube soldering contamination

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