Contact Tip And Gas Nozzle Installation; Connection To Feeder; Connection To Lincoln Feeders; Connection To Tweco Adapted Feeders - Lincoln Electric MAGNUM 250 Operator's Manual

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CONTACT TIP AND GAS NOzzLE INSTALLATION

a. Choose the correct size contact tip for the electrode
being used (wire size is stenciled on the side of the
contact tip) and screw it snugly into the gas diffuser.
b. Slip the appropriate gas nozzle onto the diffuser.
The proper nozzle should be selected based on the
welding application. Different length nozzles are
available to fit 250, 350, 450 and 550 amp gun
tubes to allow either spray or short-circuiting trans-
fer welding.
Choose the gas nozzle as appropriate for the
GMAW process to be used. Typically, the contact tip
end should be flush to .12" (3.1 mm) extended for
the short-circuiting transfer process and .12" (3.1
mm) recessed for spray transfer. For the
Outershield (FCAW) process, 1/8" (3 mm) recess is
recommended.

CONNECTION TO FEEDER

CONNECTION TO LINCOLN FEEDERS

Gun cable assemblies which were assembled with a
K466-1 or -8 Connection Kit will connect easily to any
Lincoln LN-7, LN-8, LN-9 or LN-25 feeders.
a. Check that the drive roll(s) and feeder guide tubes
are appropriate for the electrode size being used.
b. Fully push the brass connector end of the gun cable
into the conductor block on the outgoing side of the
feeder wire drive. Secure the cable using the hand
screw or set screw in the conductor block.
c. Insert the control cable plug from the feeder trigger
circuit into the mating socket on the feeder end
cable handle (See K466-1 Installation Section.)
d. Slide the free end of the flexible hose onto the
barbed gas fitting on the front of the Lincoln feeder
(See K466-1 or -8 Installation Section.) Move the
corresponding tubing clamp down near the end of
the tube to assure a good gas seal.
CONNECTION TO ADAPTED FEEDERS
Gun cable assemblies which were assembled with a
K466-2 Connection Kit will connect easily to any prop-
erly adapted feeder.
a. Check that the adapter and feeder outgoing guide,
as well as the drive roll, are appropriate for the elec-
trode size being used.
INSTALLATION
b. Fully push the brass connector end of the gun cable
c. Insert the control cable plug from the feeder trigger

CONNECTION TO MILLER FEEDERS

Gun and cable assemblies which were assembled with
a K466-3 Connector Kit will connect easily to a variety
of popular Miller wire feeders.
a. Check that the gun liner, connector cap liner, drive
b. Fully push the brass connector end of the gun and
c. Insert the control cable plug from the feeder trigger

CONNECTION TO hOBART FEEDERS

Gun and cable assemblies which were assembled with
a K466-4 Connector Kit will connect easily to a variety
of Hobart wire feeders.
a. Check that the gun liner, connector cap liner, drive
b. Fully push the brass connector end of the gun and
c. Insert the control cable plug from the feeder trigger
d. Slide the free end of the flexible hose (mounted to
MAGNUM® PRO 250, 350, 450 & 550 AMP
into the brass adapter on the outgoing side of the
feeder wire drive. Secure the cable using the hand
screw or set screw in the adapter.
circuit into the mating socket on the gun cable con-
nector handle .
rolls and guide tubes are appropriate for the elec-
trode size being used.
cable into the connector receptacle on the outgoing
side of the feeder wire drive. Tighten the hand
screw to clamp down on the connector.
circuit into the mating socket on the gun cable con-
nector handle.
rolls and guide tubes are appropriate for the elec-
trode size being used.
cable into the connector receptacle on the outgoing
side of the feeder wire drive. Tighten the hand
screw to clamp down on the connector.
circuit into the mating socket on the gun cable con-
nector handle.
the gun in K466-4 Installation Section) onto the gas
fitting on the Hobart wire feeder. Move the corre-
sponding tubing clamp down near the end of the
tube to assure a good gas seal.
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