Improved scarfing tool consists of a mount-table, roller-guided assembly. It converts a conventional routing machine for relatively precise field preparation of pipes for welding

Wallace, E. D.

English

NASA Technical Reports Server

Indexing Roller 
Adjustment Slot	 Router	 Fixed-Position 
-4ACu,tter Roller 
ded
VCutter 
aded	 Adjustment 
Spring-Lo 
Roller
Pipe Section 
of Mount Table 
December 1968	 Brief 68-10551 
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. 
Weld Preparation Tool for Pipes and Tubing 
Rack and Pinion
The problem: 
To devise a tool for precise .
 field preparation of 
piping or tubing for weld joining. Weld joint geom-
etry on the ends of large diameter piping or tubing, 
is normally prepared by hand filing, torch cutting, 
grinding, or machining. These techniques require 
either relatively cumbersome track-guided or center-
chuck-guided devices or. require that the pipe sec-
tion be transported to shops for machining with large 
equipment. Present field equipment is generally cum-
bersome or imprecise, and the use of shop equipment 
is often expensive and time consuming.
The solution: 
An improved scarfing tool, consisting of a mount-
table, roller-guided assembly, which can convert a 
conventional routing machine for relatively precise 
field preparation of pipes for welding. This tool is 
inexpensive, highly portable, and designed for.
 opera- 
tion by personnel having a minimum of training and 
skill. 
How it's done: 
The innovation is shown in simplified form in the 
figure. The mount table and a series of rollers form 
(continued overleaf) 
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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a guiding assembly which, when attached to a con-
ventional router or similar device, converts the 
tool into a pipe or tube weld-joint preparation de-
vice. 
The mount table is attached by recessed screws to 
the router case. A fixed-position roller, bolted to 
the mount table, and an indexing roller, attached to 
the table by a shaft-bolt through an adjustment slot, 
are used to adjust and maintain the radial depth of 
rout. Use of an appropriate cutter or grinder tool, 
adjusted to the proper depth by the rack and pinion, 
permits preparation of the precise geometric con-
figuration required. The spring-loaded roller and 
the arm portion of the mount table are aids to the 
operator in maintaining the machine in proper posi-
tion during the operation. 
Notes: 
1. This innovation could be of interest to companies 
with field installations requiring the preparation 
of large, weld-joined piping systems such as those 
used in process plants, refineries, and water or 
petroleum pipelines.
No additional documentation for the invention is 
available. 
Technical questions may be directed to: 
Technology Utilization Officer 
Kennedy Space Center 
Kennedy Space Center, Florida 32899 
Reference: B68-10551 
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: Elvis D. Wallace

Kennedy Space Center
(KSC-09955) 
Brief 68-10551	 Category 05


Weld preparation tool for pipes and tubing

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