The Hood River glacier. (Hood River, Or.) 1889-1933, 1913-08-07
A KNIFE OF FLAME
Wonderful Work Done by the
0xyacetyene Torch.
A MARVEL IN CUTTING STEEL.
>s,is Astonishing Tool Will Slice a
Massive Metal Beam Almost as
Quickly as Though IT Were Made of
Cheese-it is Also Used For Welding.

Ineese-t 10 Also Used For welding
One Of the most curious instrument
used by the structural iron workers
and steel shipbuilders, the most as
tonishng in its performance and tn,
most spectacular when seen at worl
is the oxyacetylene torch. 1t is mad,
in two forms-a welding torch and {
cutting torch. With the former cas-
iron. cast steel. steel, wrought iron
aluminium, brass. copper, platinum
and various alloys can be welded will
ease, while perfect weld can alsC
be made between any combination
OF cast iron, steel, brass and copper
Yields are often made in steel and iroI
with this torch up to eight and nine
inches in thickness, the heaviest wel6
of which there is any record being
fourteen inches.
With the cutting torch steel and iror
(other than cast iron) are readily cut
with the aid of mechanical devices fol
guiding the torch. up TO thickness OF
eight or nine inches. This means that
with the oxyacetylene torch a piece OF
steel eight of nine inches thick and OF
any width can be cut squarely in two
| just as carpenter saws through q
board or beam. The kerr in cutting
the steel-that is the part of the metal
that is burned away where the cut is
made-is only about one-eighth Of an
inch wide.
| Steel six inches thick can be cut In
this way at the rate of one foot in
three minutes.
To the man who knows nothing Oh
chemistry or what actually takes place
when any object burns this seems in
credible. When the process of combus-
tion is explained the mystery is swept
away. Combustion, then, In its sim
plest terms, consists in raising the
temperature of an object to point
where 1t will unite chemically with the
oxygen of the air. When this chemi.
cal action takes place it is accompani-
ed by light and heat, and the object is
said to "burn."
This temperature varies greatly with
different objects or substances. Many
substances that burn at a comparative
ly low temperature can be set on fire
with a match. With these substances
every one is familiar, and other sub
stances that will not readily burn
when match is applied to them are
popularity regarded as "fireproof."
But this is wrong view. 1t may
simply mean that the temperature at
which the object will burn-called the
"kindling temperature"-is too high to
be reached by the burning match. This
is the case with iron and STEEL and
when the oxyacetylene fame cuts
| through q bar Of steel nine inches
thick and three feet wide it simply
burns up a layer of the metal one
eighth of an inch In thickness
The welding torch, to describe it as
simply as possible, consists of handle
through which extend two tubes OF
brass These tubes are connected with
two gas tanks, one containing oxygen
and the other acetylene, and these
gases are admitted to the tubes by
valves at the rear. the oxygen entering
the upper tube and the acetylene the
lower. Both tubes open into the head
of the torch, into which Is screwed q
nozzle or tip. The gases enter this tip
by separate passages and are there
mixed together and, being under pres.
sure. spurted from the jet. The acety.
lene is first turned on and lighted
This is the fuel Of the fame Then the
oxygen is turned on. This supports
| the flame.
The quantity Of each gas can be reg
ulated by the valves, and thus there is
| produced what is called a neutral
tiame"-that is to say, 1t contains nei
ther an excess of oxygen nor Of acety'
lene, but just enough of each to &C.
complish complete combustion. The
temperature produced by this fame
with an almost pencil point concentra'
ton, is approximately $500 degrees #
In the cutting torch there is differ.
ence In construction, because the OBJ
| ject now is not only to heat the metal
| but also to burn ito consume 1t by
fire. The torch is so made, therefore
that at first "preheating" fame
which is the same as the welding
fame, is directed against the metal, Its
purpose being to heat the metal to in.
candescence. or white heat" When
this point Is reached slight move
ment of the thumb on the hand hold
ing the torch opens a valve that sends
rushing against the hot metal a sepa
rate stream Of oxygen under high pres
| sure.
At its great heat of $500 degrees and
in the presence of this free oxygen the
metal readily burns The iron or steel
IS the fuel, and the stream of oxygen
supports the combustion.
The cutting torch is now used in the
repair of ships in many ways. A new
ssntilator hole, portfolio, a piece OF
damaged deck or side plating can be
cut out and removed in few minutes
Very often when new boilers are to be
installed IN a vessel the old ones are
cut into pieces with the torch and re
Tribune.
The attitude of unhappiness is moi
only painful: 1t is mean and ugly
James.
Nnkire