ESAB SabreCut SC-270 WH Mode D'emploi page 5

OPERATION
OPERATING PRECAUTIONS IMPORTANT OPERATING NOTES
1. Pressures given in Tables 2 through 10 are measured at the
Do not exceed 15 psig acetylene during operation.
regulator using 25-ft. long hoses (1/4-in. I.D. up through size
No. 5 welding/heating head or for cutting up to 3-in. thick steel;
Flow: There must be proper flow of gases for safe operation and
3/8-in. I.D. for larger heads or cutting nozzles). If longer hoses
full performance. This requires the following three conditions: (1)
are required, only 3/8-in. I.D. hoses should be used and pressure
the regulators that determine the inlet pressure to the hoses must
drop between regulator and torch should be considered. Use
be set to the correct pressure: (2) the hoses and their connectors
test gauge adaptors to check for proper pressure at torch if using
must have adequate capacity for the job (hoses that are too
long hose lengths, or if there are doubts about the adequacy of
long, too small or have connectors with small passageways can
cause problems); and (3) the throttle valves on the torch must gas flows.
be adjusted with the procedure shown in these instructions.
For consumption purposes, the following are the oxygen fuel gas
Note: Items (1) and (2) can be checked by measuring the gas ratios normally required for welding and heating:
pressures at the torch. Gauge adaptors are available for
1.1 to 1.5 cfh oxygen/1.0 cfh acetylene
this purpose.
3.2 to 3.6 cfh oxygen/1.0 cfh FG-2
3.5 to 4.5 cfh oxygen/1.0 cfh propane
Backfire: Improper operation of the torch or cutting attachment
1.7 to 2.0 cfh oxygen/1.0 cfh natural gas
may cause the flame to go out with a loud 'pop' . (If you are weld-
ing, the flame will often reignite instantly.) Such a backfire may
2. Correct pressure and flow must be maintained for proper
be caused by contact of tip or nozzle with the work, by spatter
operation of a welding or heating head. If a tip is "starved" due
from the work, by the use of incorrect gas pressure, or by leakage
to insufficient flow of fuel gas, the tip may overheat and cause
at the cutting nozzle seats due to dirt or nicks on seats or to a
backfire or flashback.
loose nozzle nut. After a backfire, you can normally relight the
flames immediately. However, if backfires occur repeatedly, shut
An acetylene or a liquefied fuel gas (LFG) cylinder has a limited
off the torch. Check the 'O'-ring seals between the welding head
capacity for delivering fuel to the tip; therefore, it is extremely
or cutting attachment and the handle, and the nozzle seats (if
important to manifold 2 or more cylinder when operating larger
cutting). Readjust operating pressure and relight.
heads to assure adequate supply of fuel gas to the tip. The rate
of withdrawal depends on type of fuel gas cylinder size, the
Flashback: Under certain circumstances, the flame may not 'pop'
contents remaining, and the outside temperature. Tabulated
out (backfire) but instead burn back inside the torch with a shrill
below is the number of the more commonly used cylinders
hissing or squeal. This is called a 'flashback' . A flashback should
never occur if (1) the equipment is in good condition; (2) preheat recommended for manifolding when using larger heads. If
using other cylinders or gases, check with your fuel gas supplier
ports on cutting nozzles or welding tips are cleaned frequently;
for recommended withdrawal rate information.
(3) operating pressures are correct; and (4) throttle valves are
adjusted properly. Should a flashback occur, IMMEDIATELY
shut off the torch. Allow it to cool off for at least a minute. Then
3. The tables show average values based on typical conditions.
check your nozzle or tip, gas pressures, readjust regulators if
The type and quality of steel, its surface condition, and purity
necessary, and relight the torch. If flashback recurs, send the
of oxygen, etc., will always have a bearing on the end results.
torch handle and welding head or cutting attachment to your
distributor for repair.
OPERATION
OPERATING PRECAUTIONS IMPORTANT OPERATING NOTES
1. Pressures given in Tables 2 through 10 are measured at the
Do not exceed 15 psig acetylene during operation.
regulator using 25-ft. long hoses (1/4-in. I.D. up through size
No. 5 welding/heating head or for cutting up to 3-in. thick steel;
Flow: There must be proper flow of gases for safe operation and
3/8-in. I.D. for larger heads or cutting nozzles). If longer hoses
full performance. This requires the following three conditions: (1)
are required, only 3/8-in. I.D. hoses should be used and pressure
the regulators that determine the inlet pressure to the hoses must
drop between regulator and torch should be considered. Use
be set to the correct pressure: (2) the hoses and their connectors
test gauge adaptors to check for proper pressure at torch if using
must have adequate capacity for the job (hoses that are too
long hose lengths, or if there are doubts about the adequacy of
long, too small or have connectors with small passageways can
cause problems); and (3) the throttle valves on the torch must gas flows.
be adjusted with the procedure shown in these instructions.
For consumption purposes, the following are the oxygen fuel gas
Note: Items (1) and (2) can be checked by measuring the gas ratios normally required for welding and heating:
pressures at the torch. Gauge adaptors are available for
1.1 to 1.5 cfh oxygen/1.0 cfh acetylene
this purpose.
3.2 to 3.6 cfh oxygen/1.0 cfh FG-2
3.5 to 4.5 cfh oxygen/1.0 cfh propane
Backfire: Improper operation of the torch or cutting attachment
1.7 to 2.0 cfh oxygen/1.0 cfh natural gas
may cause the flame to go out with a loud 'pop' . (If you are weld-
ing, the flame will often reignite instantly.) Such a backfire may
2. Correct pressure and flow must be maintained for proper
be caused by contact of tip or nozzle with the work, by spatter
operation of a welding or heating head. If a tip is "starved" due
from the work, by the use of incorrect gas pressure, or by leakage
to insufficient flow of fuel gas, the tip may overheat and cause
at the cutting nozzle seats due to dirt or nicks on seats or to a
backfire or flashback.
loose nozzle nut. After a backfire, you can normally relight the
flames immediately. However, if backfires occur repeatedly, shut
An acetylene or a liquefied fuel gas (LFG) cylinder has a limited
off the torch. Check the 'O'-ring seals between the welding head
capacity for delivering fuel to the tip; therefore, it is extremely
or cutting attachment and the handle, and the nozzle seats (if
important to manifold 2 or more cylinder when operating larger
cutting). Readjust operating pressure and relight.
heads to assure adequate supply of fuel gas to the tip. The rate
of withdrawal depends on type of fuel gas cylinder size, the
Flashback: Under certain circumstances, the flame may not 'pop'
contents remaining, and the outside temperature. Tabulated
out (backfire) but instead burn back inside the torch with a shrill
below is the number of the more commonly used cylinders
hissing or squeal. This is called a 'flashback' . A flashback should
never occur if (1) the equipment is in good condition; (2) preheat recommended for manifolding when using larger heads. If
using other cylinders or gases, check with your fuel gas supplier
ports on cutting nozzles or welding tips are cleaned frequently;
for recommended withdrawal rate information.
(3) operating pressures are correct; and (4) throttle valves are
adjusted properly. Should a flashback occur, IMMEDIATELY
shut off the torch. Allow it to cool off for at least a minute. Then
3. The tables show average values based on typical conditions.
check your nozzle or tip, gas pressures, readjust regulators if
The type and quality of steel, its surface condition, and purity
necessary, and relight the torch. If flashback recurs, send the
of oxygen, etc., will always have a bearing on the end results.
torch handle and welding head or cutting attachment to your
distributor for repair.
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