Mounting Of Mig Welding Gun; Mounting And Locking Of Wire Reel; Automatic Wire Feed To Gun; Adjustment Of Pressure - Kemppi FU 11 Operation Instructions Manual

For very heavy welding with 1.0-1.2 mm filler wires we recommend you to use the following feed rolls with ball
bearing, where there are deviating from other feed rolls two similar grooves:
3138650 red, with plain groove, for 1.0 mm wires
3137390 orange, with plain groove, for 1.2 mm wires
3137380 orange, with knurled groove, for 1.2 mm wires

Mounting of MIG welding gun

In order to ensure trouble-free welding check in operation instructions of gun used by you that wire guide tube and
contact tip of gun are according to manufacturer’s recommendation suitable to be used for wire feed diameter and
type in question. Too tight a wire guide tube might cause for wire feeder unit a bigger stress than normally as well as
disturbances in wire feed.
Screw snap connector of gun tight that there won’t come any voltage losses on connecting surface.
Loose connection will heat gun and wire feeder unit.
When you are using liquid-cooled gun, mount cooling liquid hoses in such a way that the ones with the red code
always are connected to the corresponding red counter-connectors and the blue ones correspondingly to the blue
counter-connectors.

Mounting and locking of wire reel

LOCKED
Check that in filler wire reel are no parts sticking out, which could e.g. chafe against chassis of the wire feeder
unit. Dragging parts might expose chassis of wire feeder unit under voltage.

Automatic wire feed to gun

Automatic wire feed makes change of wire reel more rapid. In reel change the pressure of feed rolls need not to be
released and filler wire goes automatically to correct wire line.
28
– Straighten about 20 cm of the wire and see that the end of it has no sharp edges (file off if necessary). A sharp
edge may damage the wire guide tube and contact tip of the welding gun.
– Draw a bit of loose wire from wire reel. Feed wire through back liner to feed rolls. Don’t release pressure of feed
rolls!
– Press the gun switch and feed a bit wire until wire goes through feed rolls to gun. See that wire is in grooves of
both feed roll pairs!
– Press still the gun switch until wire has come through contact tip.
Automatic feed may sometimes fail with thin wires (Fe, Fc, Ss: 0,6...0,8 mm, Al: 0,8...1,0 mm). Then it might be
possible that you must open feed rolls and feed wire manually through feed rolls.

Adjustment of pressure

Adjust the pressure of feed rolls with the control screw so that the wire is fed into the wire guide tube evenly and
allows a little braking when coming out from the contact tip without slipping at the feed rolls.
Excessive pressure causes flattening of the filler wire and damage to the coating. It also causes undue wear
of the feed rolls as well as friction.
Adjustment of tightness of reel brake
20 / 1923590 / 9907
OPEN
28
41
– Release locking nails of wire reel hub by turning locking
knob a quarter round.
– Mount the reel at its place. Note rotating direction of
reel!
– Lock the reel with locking knob, locking nails of hub re-
main to outside position and will lock the reel.
– Make sure that groove of feed roll match the diameter of
welding wire used. Feed roll groove is selected by mov-
ing the groove selecting washer (28).
– Release the wire end from reel and cut off the bent
length. Be careful that the wire does not spill from the
reel to sides!
Brake force is adjusted through hole in locking device of reel
hub by screwing the control screw (41) with screwdriver.
Adjust brake force as so big that the wire is not allowed to
become too loose on the reel so that it would spill from the
reel when the rotation of the reel stops. Need for brake force
is increased with increase of wire feed speed. Since the
brake loads for its part the motor, you shouldn’t keep it un-
necessarily tight.