Mig Welding - Lincoln Electric HANDY MIG Manual De Instrucciones

MIG Welding

Table below shows the recommended material/gas
combinations for MIG welding with solid electrodes.
Material
Carbon Steel
Low Alloy Steel
Flux-cored (Innershield) Welding
The recommended electrode for the flux-cored,
selfshield process is 0.9 mm diameter Lincoln
Innershield NR-211-MP on 0.45 kg spools.
Sequence of Operations for Wire 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 spool
maintain tension on the wire. To prevent the spool
from unwinding and do not release the wire until
after step 8.
Gas
CO or Argon / CO
2 2
CO or Argon / CO
2 2
6. Cut the bent portion of wire o ff 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 gun trigger after wire appears at the
end of the gun.
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 t ip.
16. Turn on the machine. The machine is now ready to
weld.
Shielding Gas (only for Handy MIG)
When using the MIG process, you will need a cylinder
of carbon dioxide (CO
shielding gas. The regulator should be installed on the
gas cylinder. An adapter and plastic washer are needed
for using 100% CO gas. This adapter is available from
2
your local gas supplier.
1. Open the cylinder valve slowly a fraction of a turn.
When the cylinder pressure gauge pointer stops
moving, open the valve fully.
2. Keep the cylinder valve closed, except when
welding. When finished welding:

Close the cylinder valve to stop gas flow.

Depress the gun trigger briefly to release the
pressure in the gas hose.

Turn off the machine.
7
) or argon-carbon dioxide mixed
2