MIG 325,405,505
Operating manual
Page 32
31. Wire feed unit
140W Motor
Four interlocked wire feed rollers ensure safe feeding of the weld wire. Depending on the wire used, the
respective feed roller with matching groove must be set in. All feed-rollers are intended for two-sided use. To
turn or exchange the feed-rollers, remove the hex socket screws (4). Ensure that the grooves of the feed-rollers
(5,6) are in true alignment with the wire guide tube (7).
When working with solid wire, the feed-rollers must be mounted as follows:
-
upper wire-feed rollers (5) with smooth surface
-
lower wire-feed rollers (6) with V-shaped groove matching the wire diameter used
(0.8 / 1.0 / 1.2 / 1.6 mm).
The knurled groove is intended for working with cored or tubular wire. The point of contact pressure of the
feed-rollers is to be set by means of a twist handle (3) in such a way that steady conveyance of the wire is
ensured and, if the wire is held fast at the contact tip nozzle, it slides without buckling.
Wire spool brake
The wire-holding arbour (1) includes a spool brake to prevent the wire spool from running on when the wire-feed
motor is stopped. The braking effect is increased by turning the hex socket screw (2) in clockwise direction.
Wire conveying inside the torch hose pack
Friction resistance of the welding wire inside the wire guide spiral increases in proportion to the length of the
hose pack. Therefore, the torch hose pack shouldn’t be any longer than necessary.
When working with aluminium welding wire, it is advised to replace the wire guide spiral with a Teflon wire
guide core. Length of torch hose pack should not exceed 3 m.
After finishing one coil of wire, it is advised to clean both the wire guide spiral and the wire guide tube by air-
blasting.
The gliding quality of the wire guide spiral deteriorates according to the amount of wire conveyed and the
properties of the wire. If wire conveyance becomes unacceptably worse, change the wire guide spiral.
2
5
1
7
6
4
3
