PRO-POINT MIG-ARC-TIG 145A Manuel De L'utilisateur page 16

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7. Lock down the top pressure roller (Fig. 14-1)
and apply a medium amount of pressure us-
ing the tension adjustment knob (Fig. 14-2).
8. Check that the wire passes through the center
of the outlet guide tube without touching the
sides (Fig. 15-1). Loosen the locking screw
(Fig. 15-2) and then loosen the outlet guide
tube retaining nut (Fig. 15-3) to make
adjustment if required. Carefully retighten the
locking nut and screw to hold the new position.
9. Remove the gas nozzle and contact tip from
the torch neck (Fig. 16)
10. Press and hold the inch button (Q) to feed
the wire through to the torch neck. Release
the inch button when the wire exits the torch
neck (Fig. 17).
11. Fit the correct sized contact tip and feed the
wire through it, screw the contact tip into
the tip holder of the torch head. Clip the
wire close to the tip (Fig. 18) unless testing
the drive tension in step 12.
11.1 Fit an aluminum contact tip of the
correct size and diameter when using
aluminum welding wire.
12. Fit the gas nozzle to the torch head (Fig. 19).
13. A simple check for the correct drive tension is
to bend the end of the wire over hold it about
4 in. from your hand and let it run into your
hand, it should coil round in your hand
without stopping and slipping at the drive
rollers, increase the tension if it slips (Fig. 20).
14. Insufficient tension on the wire spool can allow it
to spin after the wire feeding mechanism stops,
forcing loops of wire off the spool to become
tangled. Increase the pressure on the tension spring inside the spool holder assembly by adjusting
the tension screw if this happens (Fig. 21).
WIRE FEED ROLLER SELECTION
This welding machine includes two V-groove drive rollers.
The importance of smooth, consistent wire feeding during MIG welding cannot be emphasized
enough. The smoother the wire feed, the better the weld.
Feed rollers, also called drive rollers, feed the wire mechanically along the length of the welding gun.
Feed rollers are designed for
certain types of welding wire
and they have different types of
grooves machined in them to
accommodate the different
types of wire. The wire (Fig. 22-1)
is held in the groove by the top
roller of the wire drive unit and is
referred to as the pressure roller
16
145A MULTI-PROCESS MIG-ARC-TIG WELDER
22-1
V-Groove
14-2
14-1
Fig. 14
Fig. 16
Fig. 18
Fig. 20
22-2
U-Groove
For technical questions call 1-800-665-8685
V1.0
15-3
15-1
15-2
Fig. 15
Fig. 17
Fig. 19
Fig. 21
Knurled-Groove
Fig. 22