Improvements in Electric Welding.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Electric Welding.
A communication from abroad by CHARLES L. COFFIN, of Detroit, in the County of
Wayne and State of Michigan, United States of America.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool and 6, Bank Street, Manchester, both
in the County of Lancaster and 323 High Holborn in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
The invention relates to an improved method of electric welding, hereinafter fully
described and claimed.
The drawings are vertical sections illustrating the invention, Figures 1 and 2
showing it applied to that process in which an arc is formed between carbons on
the same side of the articles to be welded, and Figure 3 showing it applied to that
process in which a voltaic arc is formed between two carbons on opposite sides of the
article to be welded.
In one arrangement, the parts to be welded together are placed in close proximity
to the voltaic arc without bringing them in actual contact therewith, and in another
arrangement the parts to be welded and the arc are protected by a jacket.
In Figure 1, F and E represent the articles to be welded, and CC represent two
plate carbons connected by the wires P P with one pole of a generator of electricity,
and B represents a carbon connected by the wire D with the other pole.
A represents a jacket of refractory material, as asbestos or fire-brick, located on one
or both sides of the articles F and E, and the outer skin of this jacket may be of
some other material, as carbon. (Indicated at G and H.)
In Figures 1 and 2 the jacket A incloses the points of the two carbons B and C and
rests upon the articles E and F which are to welded.
In Figure 2, as the arc is formed between two carbons both of which are over
the article to be welded, it is only necessary to protect the upper side of said articles
with the jacket, and therefore the jacket A is entirely on the upper side of the
articles F and E, and the carbons B and C pass through holes respectively at the top
and side of the jacket.
In Figure 3, the carbons B and C are above and below the articles F and E to
be welded, which pass through a space between the upper and lower part of the
jacket.
It will be noticed that the edges of the articles E and F to be welded are in no
case directly within the voltaic arc, but are in close proximity thereto, and that the
heat of the arc is concentrated and protected from dissipation by the jacket A,
whereby burning the edges of the articles F and E through the intense heat of
the voltaic arc is avoided, but yet they are readily brought to a plastic condition
and they are then pressed together in any of the well known modes to form weld.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is :-
The herein described method of electric welding, consisting in placing the parts

page_text: to be welded in close proximity to a voltaic arc, protecting the are and the parts to be
welded by a jacket of non-conducting refractory material, and, after sufficiently
heating the parts, pressing them together to complete the weld.
Dated this 4th day of June 1890.
W. P. THOMPSON & Co.,
Agents for the Applicant.