INSTRUCTIONS for
W-42 & W-43 HEATING TORCHES
These INSTRUCTIONS are for experienced operators. If you are not fully familiar with the principles of operation
and safe practices for oxy-fuel gas equipment, we urge you to read our booklet "Precautions and Safe Practices,"
Form 2035. Do NOT permit untrained persons to install, operate, or maintain this equipment. Do NOT attempt to
install or operate this equipment until you have read and fully understand these Instructions. If you do not fully
understand these Instructions, contact your supplier for further information.
F-6739-J
March, 1995
W-43
W-43 With W ater-Cooling Jacket
I. OPERA TING INSTRUCTIONS
These heating torches are designed for use with medium pressure acetylene. They are not for use with lowpressure acetylene (less than 1 psi). The W-42 has the
rated capacity (consumption - oxygen and acetylene) of
500 cfh; the W-43 is rated up to 1000 cfh.
These torches also may be used with other fuel gases,
such as propane, methane, hydrogen and natural gas.
Each of these torches is available with either a long or
short mixer tube. You can purchase the mixer tubes
separately to convert from one length to the other .
IMPORTANT: Use only clean water. Do not use the
water at more than 50 psi. Higher pressure may damage the heating head or
the water jacket.
SHUTOFF VALVE - For best performance you should
use a quick-acting double shutoff valve to control the
flow of oxygen and Fuel Gas to your torch. The V-21
Shutoff Valve (07X67) is available and recommended
for use with the W-42 and W-43 To rches.
HOSES - 1. Use 1/2-in. I.D. oxygen and acetylene
hoses with "C" -size (7/8-in.-14) fittings,
except on the W-43, use 3/4-in. I.D. acetylene hose with "D" size (1-1/4-in.-12) fittings.
2. Connect the hoses in lengths as required
to the regulators and to the quick-acting
shutoff valve.
3. Connect the hoses to the torch and to the
quick-acting shutoff valve. (Hose lengths
should be no less than 6-ft. on the W-42;
8-ft. on the W-43.)
4. Tighten all hose connections with a
wrench.
NEEDLE VALVES - If you need a commercial needle
valve in the fuel gas line to adjust flow, you may insert it
in the line to adjust flow, you may insert it in the line
between the shutoff valve and torch, or close to the inlet
side of the shutoff valve.
Be sure this information reaches the operator.
You can get extra copies through your supplier .
If it is absolutely necessary for you to use a needle valve
in the oxygen line, connect it close to the inlet side of
the quick-acting shutoff valve. DO NOT connect an
oxygen needle valve between the shutoff valve and
torch.
WATER-COOLING JACKET - Water-cooling jackets
are available only for torches with the long mixer tube.
Torches with the short mixer tube should not be used
where water cooling of the torch is necessary. To install water-cooling jacket on torch:
ing. The connections to and from the heating head
should also be arranged so that air does not pocket.
TO ADJUST PRESSURES
Open the quick-acting double shutoff valve, first making
sure that any needle valves in the line are wide open.
Turn in the pressure-adjusting screw on both the oxygen and fuel gas regulators until the delivery-pressure
gages indicate the correct oxygen and pressures. In
most applications, the oxygen and fuel gas pressures
will be equal and will be between 3 and 8 lb. per sq. in.
1. Make sure the outside surface of the torch mixer tube
is bright and clean.
2. Slip the water-cooling jacket (large end toward the
torch body) over the torch mixer tube.
3. Tighten the small socket head setscrew, located at
the small end of the jacket, so that the setscrew locates in the small recess in the front end of the mixer
tube.
4. Solder the jacket to the torch mixer tube by running
soft solder around the mixer tube where the ends of
the jacket contact the tube.
HEA TING HEAD - Connect the heating head to the torch
mixer tube. If desired, the connection may be made by
means of an angled adaptor or flexible metal hose. Also
available are connections (nut and nipple) with blank
outlets which can be machined to desired thread size.
Your ESAB representative will be glad to advise you
what parts will be needed to meet your specific requirements.
When using a torch with a short mixer tube, the minimum distance between the torch body and the heating
head flames should be 1 1 5/8-in. for the W-42S and 19
5/8-in. for the W-43-S.
Do not leave the shutoff valve open any longer than necessary to adjust the gas pressures. Make sure there
are no sparks or flames near the heating flame ports.
Wait a minute or two for the gas discharged during the
setting of the regulators to dissipate before lighting the
heating head.
TO LIGHT
First make sure the cooling water supply is turned on.
Then open the quick-acting double shutoff valve. Light
the gas issuing from the heating head flame ports with a
pilot flame. Adjust the flames as required.
If the flames burn away from the heating head or blow
off as soon as lit, reduce the pressure setting of the regulators. If the flames are too short or snap out, increase
the pressure setting of the regulators before relighting.
If a fuel gas needle valve is used to balance gas flows,
adjust the flame as outlined above with the fuel gas
needle valve wide open. After the desired flames are
obtained, readjust the pressure setting of the fuel gas
regulator until each flame shows an excess fuel gas flow.
Adjust the flames to neutral with the fuel gas needle
valve.
All OXWELD multiflame heating heads are designed to
provide the proper distance between torch body and
flames. Shorter heating heads will require the use of
adaptors or extensions.
1. Connect the "water-out" connection on the jacket to
an adequate water supply .
2. Connect the "water-out" connection on the jacket,
by means of copper tubing, to the heating head water inlet connection.
3. Connect the heating head "water-out" connection by
means of copper tubing and hose to an adequate
water drain.
If it is necessary to use the torch in such a position that
the rear body is lower than the front end, the water connections should be reversed so as not to pocket air.
Connect the inlet water supply to the "water-out" connection on the jacket. Then connect the "water-in" connection on the heating head by means of copper tub-
TO SHUT OFF
Close the quick-acting double shutoff valve to shut off
the torch. Never use the regulators or needle valves for
this purpose.
OPERA TING PRECAUTIONS
Improper handling of the torch may make the flames
backfire -- go out with a loud snap. This may be caused
by touching the tips against the work, by overheating
the tips, by operating the torch at other than recommended gas pressures, by a loose head to tip, or by dirt
on the seating surfaces of the mixer or the mixer seat.
The torch may be relighted after a backfire if the trouble
has been corrected.
Should the flame flashback - burn back inside the torch
with a "whistle" -- "immediately" close the quick-acting
shutoff valve. Allow the torch to cool and then relight the
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