Lighting And Using The Brazing Tip - Hobart 770 500 Owner's Manual

7-4. Lighting And Using The Brazing Tip

Always purge gas from the system
!
before lighting torch to prevent a
possible mixed-gas
Purge gas in a well ventilated area
and away from flame or sparks. See
Sections 7-1 and 7-2.
Do not use matches or a cigarette
!
lighter to ignite the gas.
Do not allow the flame to touch the
!
brazing tip or allow the brazing tip to
overheat.
.
See Sections 5-3 and 5-4 for oxygen
and fuel pressure recommendations.
.
See Sections 7-1 and 7-2 for informa-
tion on adjusting oxygen and fuel pres-
sure.
1 Spark Lighter
2 Oxygen Valve
3 Fuel Valve
OM-254 957 Page 16
Lighting The Torch
Hold the spark lighter near the torch tip.
explosion.
Slowly open the fuel valve on the torch
handle about 1/8 turn and quickly squeeze
the spark lighter to light the flame.
Slowly open the oxygen valve on the torch
to neutralize the flame.
Open the fuel valve on the torch handle
another 1/8 turn and then increase the
oxygen to neutralize the flame.
Continue this procedure until the maximum
amount of fuel gas is used and the desired
flame is present.
When Finished Welding/Brazing
NOTICE − Shut down torch in correct se-
quence or the torch may be damaged.
Oxygen must be released from the system
first or residual fuel in the handle or fuel
hose may burn. Fuel cannot burn without
oxygen.
1
3 2
Tools Needed:
161-039 / 040
When finished welding/brazing, close the
oxygen valve on the torch handle first and
then close the fuel valve on the torch
handle.
Turn valves at fuel and oxygen cylinders
clockwise to the closed position.
Open the fuel valve on the torch handle to
relieve pressure; both gauges on the fuel
regulator should indicate zero (0) pressure.
Close the fuel valve on the torch handle.
Turn fuel regulator adjustment handle
counterclockwise until there is no pressure
on the regulator diaphragm.
Open the oxygen valve on the torch handle
to relieve pressure; both gauges on the
oxygen regulator should indicate zero (0)
pressure. Close the oxygen valve on the
torch handle.
Turn oxygen regulator adjustment handle
counterclockwise until there is no pressure
on the regulator diaphragm.