Kemppi fastmig MF 29 Operating Manual - page 10
EN
• Draw a bit of loose wire from wire spool. Feed wire through back liner to feed rolls. Do
not release pressure of feed rolls!
• Press the gun switch and feed 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).
In that case you might have to open feed rolls and feed wire manually through feed rolls.
3.5 Adjustment of pressure
Adjust the pressure of feed rolls with the control screw (20) 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.
NOTE!
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.
3.6 Adjustment of tightness of spool brake
A
B
Brake force is adjusted by screwing the adjusting nut (B), tightening clockwise direction.
Adjust brake force as so big that the wire is not allowed to become too loose on the spool so
that it would spill from the spool when the rotation of the spool 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 unnecessarily tight.
3.7 Burn back time
Electronics of feed unit controls stopping of welding automatically so that the wire end
doesn’t melt fastened to the contact tip or the work piece. Automatics work regardless of the
wire feed speed. Can be adjusted also from power source SETUP-menu ('PoC').
3.8 Ground cable
Connecting of earth cable should be preferably connected directly to the welding material.
Contact surface of press always should be as large as possible.
Clean the fastening surface from paint and rust!
Use in your MIG equipment at least 70 mm². Thinner cross-sectional areas might cause
overheating of connectors and insulations.
Make sure that the welding gun in your use is designed for max. welding current needed by
you!
NOTE!
Never use a damaged welding gun!
3.9 Shielding gas
NOTE!
Handle gas cylinder with care. There is a risk for injury if the cylinder or its valve is damaged!
For welding stainless steels, mixed gases are normally used. Check that the gas cylinder valve
is suitable for the gas. The flow rate is set according to the welding power used in the job. A
suitable flow rate is normally 8 – 10 l/min. If the gas flow is not suitable, the welded joint will
be sporous. Contact your local Kemppi-dealer for choosing gas and equipment.
FastMig MF 29
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