Ventilated barrel assembly aids installation of studs on narrow uneven weld lands. The modified faceplate permits proper aligning of the percussion stud-welding gun in any position and on a smaller surface, and it maintains gap setting without any other adjustment

Johnson, R. E.

English

NASA Technical Reports Server

July. 1970	 Brief 70-10044 
NASA TECH BRIEF 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefsare available on a subscription basis from the Clearinghouse for Federal Scientific and Technical 
Information, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Modified Faceplate Assembly for Stud-Welding Gun 
A ventilated barrel assembly 1 inch in, diameter 
was developed to replace the present faceplate on 
percussion stud welding guns. This innovation en-
ables studs to be installed on areas that have either 
short-edge distance or distorted surfaces without 
additional tooling. 
Standard faceplate assemblies did not provide a 
means for making acceptable stud wells on the weld 
land of a specific bulkhead meridian weld. The weld 
land was too narrow (1 inch) and it had an un-
even surface due to weld peaking. The modified 
faceplate assembly (see figure) is smaller and makes 
possible completely satisfactory welding of studs, to 
the narrow, uneven weld land. The principal difference 
between the two faceplates is that the modified one
permits proper aligning and positioning of the per-
cussion stud welding gun on a much smaller surface 
area than the standard one. 
Other features of this innovation that make it supe-
rior to available standard assemblies include: (1) 
the gap setting can be set and maintained without 
any other adjustment; (2) the stud-welding gun can 
be used in any position; and (3) verification samples 
can be made on a 1-inch square instead of a 3-inch 
square. 
Notes: 
1. This innovation may be of interest to manufac-
turers who use percussion studs. 
2. No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama .
 35812 
Reference: B70-10044 
Patent status: 
No patent action is contemplated by NASA. 
Source: Robert E. Johnson of 
North American Rockwell Corp 
under contract to 
Marshall Space Flight Center 
(MFS- 16725) 
Category 08 
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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Modified faceplate assembly for stud-welding gun

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