Lincoln Electric HANDY MIG Operator's Manual page 11

Sequence of Operations
Loading
Turn machine power switch to the OFF ("0") position
before working inside the wire feed enclosure. Make sure
that the wire feed drive roll and contact tip of the gun
match the diameter and type of wire used.
1. Push the spool onto the spindle so that the wire feeds
off the bottom of the spool, toward the drive roll.
2. Push the spool spacer onto the spindle, against the
spool. If it is necessary, for getting proper breaking
torque you should rotate the spool spacer.
3. Slide the spring onto the spool, then press on the
spool lock, turning it clockwise to lock the spool
assembly onto the spindle.
4. Release the spring loaded thumbscrew and rotate the
idle roll arm away from the wire feed drive roll. Ensure
that the visible, stenciled size on the drive roll side
facing you matches the wire size being used.
5. Carefully detach the end of the wire from the
spoolmaintain tension on the wire. To prevent the
spool from unwinding and do not release the wire until
after step 8.
6. Cut the bent portion of wire off and straighten the first
100 mm.
7. Thread the wire through the ingoing guide tube, over
the drive roll, and into the gun liner.
8. Close the idle roll arm and turn down the thumbscrew
until the idle roller presses down firmly on the wire.
(Now you may release the welding wire.) Make sure
the wire is positioned in the groove of lower drive roll.
9. The spring loaded thumbscrew on the idle roll arm can
be used as a "brake" to adjust the pressure on the
wire. Adjust pressure by turning the thumbscrew to
prevent wire overrun, but still allow smooth and easy
wire feeding. Start with the pressure set to an
intermediate value. Readjust, if necessary. Slightly
less pressure may be required when using 0.6 mm
wire. If the drive roll slips while feeding wire, the
pressure should be increased until the wire feeds
properly.
10. Remove the nozzle and contact tip from the gun.
11. Turn the machine ON ("I").
12. Straighten the gun cable assembly.
13. Depress the gun trigger switch and feed welding wire
through the gun and cable. (Point the gun away from
yourself and others while feeding wire.) Release the
English
gun trigger after wire appears at the end of the gun.
for Wire
14. Turn the machine OFF ("0").
15. Replace the contact tip. Cut the wire off so that 10 to
15 mm protrudes from the end of the tip.
16. Turn on the machine. The machine is now ready to
weld.
Welding
1. Select the right welding process based on the type
and condition of the pieces to be welded; the
environment in which welding is to be done; and the
desired finished appearance of the weld.
2. Select and install the welding wire to match the
process. Use Genuine Lincoln Electric Brand wire.
Wire quality is essential for successful welding.
3. Install the drive roll, contact tip, and nozzle appropriate
for the weld process.
4. Check that the polarity is correct for the welding wire
being used and that the gas supply, if required, is
turned on.
5. Refer to above Figure. Connect the work clamp to the
metal to be welded. The work clamp must make good
electrical contact to the work piece. The work piece
must also be grounded as stated in Welding Safety
Precautions in the beginning of this manual.
6. Based on the welding process type and material
thickness of the work piece, set the correct wire speed
and heat range setting.
7. Based on the weld joint type and orientation of the
weld joint, position the gun into the joint at the correct
angel.
8. To begin welding, raise your hand shield to protect
your eyes and pull the trigger.
9. While welding, travel at a constant speed and maintain
an electrode stickout of 9 mm. Follow the correct
direction of travel for the process and joint type and
orientation.
10. To stop welding, release the gun trigger.
11. When no more welding is to be done, close the valve
on the gas cylinder (if used), momentarily operate the
gun trigger to release gas pressure, and turnoff the
machine.
Cleaning Tip and Gas Nozzle
Clean the contact tip and gas nuzzle to avoid arc bridging
between them. Bridging can result in a shorted nozzle,
poor welds and an overheating gun. Anti-stick spray or
gel, available from a welding distributor, may reduce
buildup and aid in spatter removal.
9 English