dualMIG 250E
Operating manual
Page 24
16. Wire feed unit
Exchange of feed-roller (4)
Depending on the wire used, the
respective feed roller with matching
groove must be set in.
To turn or exchange the feed-
rollers, remove the knurled
screw (5).
Left-hand thread.
Ensure that the groove of the feed-roller
is in true alignment with the wire guide
tube (6).
wire feed unit
The contact pressure exerted by the feed-rollers is regulated via a star grip (7) in such a way that steady
conveyance of the wire is ensured and, if the wire is
held at the contact tip nozzle, it slides without buckling.
The welding wire and all metal components have welding voltage.
Never contact it with the case.
Care for good isolation.
Wire spool brake
The wire-holding arbor (2) includes a spool brake to prevent the wire spool (3) from running on when the wire-
feed motor is stopped. The braking effect is increased by turning the hex socket screw (1) in a 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.
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