Improvements in Heating and Welding by Electricity.
Year: 1892

page_text: Date of Application, 13th May, 1892
Complete Specification Left, 13th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Heating and Welding by Electricity.
I, HENRY HOWARD, of Coombs Wood Tube Works, Halesowen near Bir-
mingham, Manufacturer, do hereby declare the nature of this invention to be as
follows:
-
This invention relates to heating and welding with the electric arc where the
work forms one pole and a pencil the other pole.
In many cases it is necessary or desirable to heat both sides of the work
simultaneously or to weld at one heat a joint of considerable length and it is difficult
and often impossible to do this with a single arc. On the other hand it has
heretofore been found impossible to employ two or more arcs simultaneously.
According to this invention I do this in the following manner :-All of the
pencils are connected to one main, say the negative main, from the battery or other
source of electricity, whilst the other main, say the positive main, is connected to
the work, and in order to prevent any variation of the current used by one are
from affecting the steadiness of the other arc or arcs I interpose between each
pencil and the main a suitable resistance.
1000
COMPLETE SPECIFICATION.
Improvements in Heating and Welding by Electricity.
I, HENRY HOWARD of Coombs Wood Tube Works, Halesowen, near Bir-
mingham, Manufacturer, 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 :-
This invention relates to heating and welding with the electric arc where the
work forms one pole and a pencil the other pole.
In many cases it is necessary or desirable to heat both sides of the work
simultaneously or to weld at one heat a joint of considerable length and it is difficult
and often impossible to do this with a single arc. On the other hand it has
heretofore been found impossible to employ two or more arcs simultaneously.
According to this invention I do this in the following manner :-All of the
pencils are connected to one main; say the negative main, from the battery or
other source of electricity, whilst the other main, say the positive main, is connected
to the work, and in order to prevent any variation of the current used by one arc
from affecting the steadiness of the other arc or arcs I interpose between each
pencil and the main a suitable resistance.
The drawing shows a diagrammatic view illustrating the invention.
A is a main connected to the negative pole of the battery, or other source of
electricity. B is a main connected to the positive pole. CC are pencils (usually
of carbon) connected by wires D D to the main A, the wires D having in them
resistances E E. F is a tube to which the flange G is to be welded. This tube is
connected to the main B and is mounted in a lathe (not shown) and caused to
revolve with the arcs playing on the joint. In some cases it is convenient to connect
the main B to the work by several wires instead of one large wire as shewn.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In heating and welding with the electric arc, the combination of a main con-
nected to one pole of the source or sources of electricity, two or more pencils
connected to the said main, two or more resistances each interposed between one
of the pencils and the said main and a second main connected at one end to the
work to be heated or welded and at the other end to the other pole of the source
or sources of electricity.
Dated this 12th dor of Santambor 1809
HENRY HOWARD.