Welding; Procedure At End Of Coil - Lincoln Electric LN-25 Service Manual

B-9
h. Turn on the welding power source, as well as the
shielding gas supply (if used).
WARNING
Unless an optional output control or internal contactor
is used, the electrode is electrically "hot" when the
power source is on. The gun trigger controls wire
feed only.
WARNING
CYLINDER may explode if
damaged.
• Keep cylinder upright and
chained to support.
• Keep cylinder away from
areas where it may be dam-
aged.
• Never lift welder with cylinder
attached
• Never allow welding elec-
trode to touch cylinder.
• Keep cylinder away from
welding or other live electrical
circuits.

WELDING

WARNING
ARC RAYS can burn.
• Do not touch metal portions
of the LN-25 lead Clip when
welding power source is on.
a. Cut the electrode within approximately
end of the contact tip for solid wire and within
approximately 3 ⁄ " of the extension guide for cored
4
wire.
b. Position electrode over joint. End of electrode
should be slightly off the work.
OPERATION
c. Lower welding helmet, close gun trigger, and
begin welding. Hold the gun so the contact tip to
work distance gives the correct electrical stickout
as required for the procedure being used.
NOTE: If the arc voltage is not within the proper
procedure range adjust the power source output
control. (The CC mode WIRE SPEED setting should
not be changed from the preset procedure value for
the proper arc voltage.)
d. To stop welding, release the gun trigger and
then pull the gun away from the work. Store the
gun in the LN-25 insulated gun holder when
not welding.

PROCEDURE AT END OF COIL

When the wire on the reel is used up, the following
procedure is to be followed for removing the old wire
from the gun cable and loading a new reel.
a. Shut off power source if a Remote Output Control
Option or internal contactor is not used.
b. Cut the end of the electrode off at the gun end.
Do not break it off by hand since this puts a slight
bend in the wire and makes it difficult or
impossible to pull it back through the nozzle.
c. U n c o u p l e t h e g u n c o n d u c t o r c a b l e f r o m
the LN-25.
d. Lay the cable out straight.
e. Using pliers to grip the wire, pull it out of the
cable from the connector end. Do not pull it from
the gun end.
f. Put the conductor cable back on wire drive unit
after the electrode has been removed.
g. Load a new coil of wire and feed it through the
cable as described in Loading Electrode Section.
OPEN ARC WELDING WITH A
CONSTANT CURRENT (formerly
variable voltage) POWER
SOURCE
Although a constant voltage (CV) power source
3 ⁄ " of the
8
is recommended for Innershield
arc (GMAW) open arc welding, satisfactory general
purpose welding may be obtained using the
LN-25 with a constant current (CC) power source
fo r n on c r i t i c al c o mm e rc i a l q u a l i ty m i l d s t eel
welding applications.
LN-25
B-9
® and gas metal