Improvements in or appertaining to Welding Metals Electrically
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in or appertaining to Welding Metals Electrically
A communication from abroad by CHARLES L. COFFIN, of Detroit, County of Wayne,
State of Michigan, United States of America, (Chemist.
I, WILLIAM PHILLIPS THOMPSON F.C.S. M.1.M.E. of the Agency for Foreign
Patent Solicitors 6, Lord Street, Liverpool and 6, Bank Street, Manchester both
in the County of Lancaster & 23 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 consists of an improved method of electric welding and metal
working, hereinafter fully described and claimed.
The drawings represent apparatus by which the invention may be practised.
Figures 1, 2 and 3 are perspectives, and
Figures 4 and 5 are partial elevations.
In Figure 1, T represents a table upon which are mounted two posts A and A', the
upper part of post A¹ being made movable, and controlled by a screw-shaft E having
a crank F. I represents insulation in all the Figures. CC represent clamps sup-
ported on posts A and A¹, but insulated therefrom, the upper half of each clamp being
movable by means of a winch G and sliding block H, or in any other convenient
manner. B represents a post, movably mounted on table T, carrying an anvil block D,
preferably of carbon, which is movable vertically by a screw shaft L. B¹ represents
a post secured to, but insulated from, table T, which carries a vertically sliding head K,
at the lower end of which is a conductor (preferably of carbon) D'. The post B¹ is
connected by a conductor Y with one pole only of a generator, and the clamps CC
are connected by a branched conductor Y', in which there may be resistance switches S
to equalise the resistance of the branches, with the other pole of said generator.
M M represent the articles to be welded together, which are clamped in the clamps C
and are supported by the anvil D, either in contact, as shown in Figures 1, 3 and 5,
or separated, as shown in Figure 4.
In the operation of this apparatus, the articles being clamped, as shown in the
Figures, the conductor D' is brought down to make contact with the articles M M,
and a heating current is then passed through the conductors Y Y¹, traversing the
articles M M, and passing out through conductor D1, or vice versa, by which the
articles M M are heated at their point of contact with the conductor D¹, when they
may be pressed together by the winch E F, to form the weld, which may be com-
pleted by hammering, rolling, etcetera.
In Figure 2, conductor D and anvil D are both represented by one pair of tongs,
which are clamped on the article M at the point where it is desired to heat said
article, and the clamps CC are connected with the article M at each side of this
point, being both connected by a branched conductor Y₁ with one pole of a generator
and the tongs D¹ being connected by the conductor Y with the other pole of said
generator.
In Figure 4, the arrangement is substantially the same as Figure 1, the con-
ductor D being raised and lowered by an eccentric K, and a similar eccentric being
substituted for the shaft L to lower and raise the anvil D'. In this Figure, the
articles M M pass through hollow magnets N N, and are not in contact, one being
connected by the conductor Y with one pole only of a generator, and the conductor D'
being connected by the conductor Y₁ with the other pole of the generator, one of
the articles M being directly heated by the current, and the other heated by the
radiation.
In Figure 3, the apparatus of Figure 4 is shown as applied to welding a hoop which

page_text: is held in the upper clamp C, provided with the eccentric K', and the clamps CC,
which are connected with the branched conductor Y', are, in this case, connected
with the hoop on opposite sides of the joint.
In Figure 5, the mechanism of Figures 3 and 4 is indicated as applied to making a
lap joint between the articles M M.
A description of the operation of Figure 1 applies to all the Figures.
Having now particularly described and ascertained the nature of the said inven-
tion 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 :-
1. The method herein described of welding metals electrically, which consists in
bringing the parts to be welded in contact with an anvil and a conductor which is
connected with one pole of a generator, connecting said articles with the other pole of
said generator only, passing a heating current through the articles and conductor,
and pressing the articles together and forming the weld while in contact with said
conductor, substantially as set forth.
2. The apparatus for welding metals electrically, combined and arranged sub-
stantially as herein described.
Dated this 29th day of September 1890.
WM. P. THOMPSON & Co.,
Agents for the Applicant.