Improvements in Arrangements and Apparatus for Welding together Parts of Furnace Shells or Flues for Steam Boilers.
Year: 1891

page_text: Date of Application, 9th Mar., 1891
Complete Specification Left, 9th Dec., 1891-Accepted, 6th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Arrangements and Apparatus for Welding
together Parts of Furnace Shells or Flues for Steam
Boilers.
I, ROBERT MCINTYRE, of 97 Paisley Road West, Glasgow, in the County of
Lanark, North Britain, Commission Merchant, do hereby declare the nature of
this invention to be as follows, that is to say :-
My said invention has for its object the welding together of parts of furnace
shells or flues for steam boilers in an improved manner, and so as the better to
resist the strains to which such shells or flues are subjected.
In carrying out my invention I build up a furnace shell or flue of a number of
short cylinders the edges of which are flanged outwards, and I unite the cylinders
by welding the meeting flanges at each joint. For the welding operation I,
according to one modification, provide a small open furnace like a boilermaker's
hearth for solid fuel, with a suitable blast; and I arrange bearings for supporting
a horizontal shaft above the hearth. On the horizontal shaft there are fixed disks
or bosses provided with adjustable segments or pieces for holding two or more of
the short cylinders concentrically with the shaft, the segments or pieces being
adjusted outwards to bear against the insides of the cylinders after these have been
placed in position. The heat of the hearth acts on the parts of two meeting flanges
which are at the time in the lowest position; and when a welding heat has been
attained the shaft is turned to bring the heated part to one side where the pair of
flanges is brought between the jaws of a portable compressing tool, actuated by
water or other suitable fluid under pressure in a cylinder forming part of the tool.
The jaws of the tool forcibly compress the flanges and complete the weld at one
part. The shaft is turned a little between each compressing action of the portable
tool so as to bring round the next part of the flanges, which part has been heated
when just previously over or in the hottest part of the hearth fire. The welding of
the flanges of one joint is thus effected step by step until completed round the
shell. The compressing jaws of the portable tool are provided with acting pieces
which are changeable; and in order that the thickness of the welded flanges may
be sufficiently uniform the jaws are made with projections or stops which prevent
them from being forced too closely together.
According to another modification there is substituted for the boilermaker's
hearth a series of blowpipe burners arranged for heating the flanges by means of
combustible gas.
Dated this Seventh day of March 1891.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION
Improvements in Arrangements and Apparatus for Welding
together Parts of Furnace Shells or Flues for Steam
Boilers.
I, ROBERT MCINTYRE, of 97 Paisley Road West, Glasgow, in the County of
Lanark, North Britain, Commission Merchant, 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 :-
My said invention has for its object the welding together parts of furnace shello

page_text: or flues for steam boilers in an improved manner and so as the better to resist the
strains to which such shells or flues are subjected.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended an explanatory sheet of drawings in the several
figures of which corresponding parts are marked with the same letters of
reference.
Figure 1 is a fragmental view of two short cylinders before welding.
Figure 2 is a similar view after welding.
Figure 3 is a general view of the welding machine and the operation of
welding.
Figure 4 is a section of the portable furnace.
Figure 5 is a part plan and part horizontal section of Figure 3.
In carrying my invention into practice I build up the furnace shell or flues of
short cylinders such as A and B, having their edges a b flanged outwards, and these
are united together by welding the meeting flanges at each joint. These short
cylinders are held in proper position during the welding operation by bolts, clamps,
or their equivalents, and the shell K or sections of the shell, made up as aforesaid,
is or are turned upon a suitably constructed carriage or carriages H. These
carriages have saddles shaped to correspond to the curvature of the shell of the
said short cylinders, and are mounted upon wheels I upon which the shell K
revolves; or in lieu of the carriage a crane may be employed.
The furnace C for solid fuel with a suitable blast D, is attached to a bar E which
is mounted on a carriage F. This bar E has a counterpoise G at its other end to
facilitate its being moved about, as seen in Figure 3. The heat of the furnace C
acts on the parts of two meeting flanges which are at the time in the lowest
position; and when a welding heat has been attained the shell K is turned to bring
the heated part to one side where the pair of flanges is brought between the
jaws c, d of a portable compressing tool J actuated by water or other suitable fluid
under pressure in a cylinder forming part of the tool. The jaws of the tool forcibly
compress the flanges and complete the weld at one part. The shell K is turned a
little between each compressing action of the portable tool so as to bring round the
next part of the flanges which part has been heated when just previously over or in
the hottest part of the furnace C. The welding of the flanges of one joint is thus
effected step by step until completed round the shell K. The compressing jaws c, d
of the portable tool are provided with acting pieces which are changeable, and in
order that the thickness of the welded flanges may be sufficiently uniform the jaws
are made with projections or stops which prevent them from being forced too
closely together.
According to another modification there is substituted for a boilermaker's hearth
or portable furnace a series of blowpipe burners arranged for heating the flanges
by means of combustible gas.
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
olaim is :-
1. Welding together parts of furnace shells or flues for steam boilers substantially
in the manner and for the purposes hereinbefore described and shown on the
accompanying sheet of drawings.
2. The apparatus for welding together parts of furnace shells or flues for
steam boilers substantially as described and shown on the accompanying sheet
of drawings.
Dated this 8th day of December 1891.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.