Kemppi fastmig MF 29 Operation Instructions Manual

Also see for FastMig MF 29: Service manual Operating manual

Contents

Kemppi fastmig MF 29 Operation Instructions Manual Manual pdf 9 page image

2.4. AUTOMATIC WIRE FEED TO GUNAutomatic wire feed makes change of wire reel more rapid. In reel change the pressure of feedrolls need not to be released and filler wire goes automatically to correct wire line.– Make sure that groove of feed roll matches the diameter of welding wire used.– Release the wire end from reel and cut off the bent length. Be careful that the wire does notspill from the reel to sides!– Straighten about 20 cm of the wire and see that the end of it has no sharp edges (file off ifnecessary). A sharp edge may damage the wire guide tube and contact tip of the weldinggun.FastMig™ MF 29 wire feed unit:– Draw a bit of loose wire from wire reel. Feed wire through back liner to feed rolls. Do notrelease pressure of feed rolls!– Press the gun switch and feed wire until wire goes through feed rolls to gun. See thatwire 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). Inthat case you might have to open feed rolls and feed wire manually through feed rolls.2.5. ADJUSTMENT OF PRESSUREAdjust the pressure of feed rolls with the control screw (20) so that the wire is fed into the wireguide tube evenly and allows a little braking when coming out from the contact tip without slippingat the feed rolls.Excessive pressure causes flattening of the filler wire and damage to the coating. It alsocauses undue wear of the feed rolls as well as friction.2.6. ADJUSTMENT OF TIGHTNESS OF REEL BRAKEAdjust brake force as so big that the wire is not allowed to become too loose on the reel so thatit would spill from the reel when the rotation of the reel stops. Need for brake force is increasedwith increase of wire feed speed.Since the brake loads for its part the motor, you shouldn’t keep it unnecessarily tight.2.7. BURN BACK TIMEElectronics of feed unit controls stopping of welding automatically so that the wire end doesn’tmelt fastened to the contact tip or the work piece. Automatics work regardless of the wire feedspeed. Can be adjusted also from power source SETUP-menu ('PoC').Brake force is adjusted by screwing theadjusting nut (B), tightening clockwisedirection.FASTMIG™ MF 29 / 0603 – 9© KEMPPI OYAB