Install Shielding Gas - Lincoln Electric POWER MIG 140 Manuel De L'opérateur

B-9
B. INSTALL SHIELDING GAS
MIG welding requires an appropriate bottle of shielding
gas. For mild steel either a cylinder bottle of Ar/CO
100% CO can be used refer to the following instruc-
2
tions to properly connect shielding gas to the machine.
WARNING
CYLINDER may explode if dam-
aged. Keep cylinder upright and
chained to support
• Keep cylinder away from areas
where it may be damaged.
• Never lift welder with cylinder
attached.
• Never allow welding electrode to
touch cylinder.
• Keep cylinder away from welding
or other live electrical circuits.
-----------------------------------------------------------------------
WARNING
BUILDUP OF SHIELDING GAS may
harm health or kill.
• Shut off shielding gas supply
when not in use.
1. Secure the cylinder to a wall or other stationary
support to prevent the cylinder from falling over.
Insulate the cylinder from the work circuit and earth
ground. Refer to Figure B.13.
2. With the cylinder securely installed, remove the
cylinder cap. Stand to one side away from the out-
let and open the cylinder valve very slightly for an
instant. This blows away any dust or dirt which may
have accumulated in the valve outlet.
WARNING
BE SURE TO KEEP YOUR FACE AWAY FROM
THE VALVE OUTLET WHEN "CRACKING" THE
VALVE. Never stand directly in front of or behind
the flow regulator when opening the cylinder
valve. Always stand to one side.
-----------------------------------------------------------------------
OPERATION
or
2
3. Attach the flow regulator to the cylinder valve and
tighten the union nut securely with a wrench.
NOTE: If connecting to 100% CO
regulator adapter is required. Purchase separately
S19298 CO
included in the fitting on the bottle side. (See Figure
B.13)
4. Refer to Figure B.13. Attach one end of inlet gas
hose to the outlet fitting of the flow regulator and tight-
en the union nut securely with a wrench. Connect the
other end to the machine Solenoid Inlet Fitting (5/8-18
female threads — for CGA — 032 fitting). Make cer-
tain the gas hose is not kinked or twisted.
SHIELDING GAS
1. For CO
mixed gas, open cylinder valve slowly a fraction of a
turn. When the cylinder pressure gauge pointer stops
moving, open the valve fully.
2. Set gas flow rate for 30 to 40 cubic feet per hour (14
to 18 I/min.) under normal conditions, increase to as
high as 40 to 50 CFH (18 to 23.5 I/min.) under drafty
(slightly windy) conditions.
3. Keep the cylinder valve closed, except when using
the machine.
POWER MIG® (140, 180 MODELS)
FIGURE B.13
MALE END
CO
2
100%
FEMALE END
75/25
MIXES
adapter be sure to install plastic washer
2
, open the cylinder very slowly. For argon-
2
B-9
REGULATOR
ADAPTER
S19298
PLASTIC
WASHER
cylinder, a CO
2 2