Kemppi FastMig KMS 400 is an inverter MIG/MAG welder for continuous work. The source gives 400 A at an 80% duty cycle and 380 A at a 100% duty cycle, weighs 35 kg and runs on 3 x 400 V. The set has an MSF 55 feeder, a FastCool 10 cooler, an SF 53 MLS panel and an interconnection package of about 10 m.
What this machine is for
This is a set for the production of heavy steel structures. A 100% duty cycle at 380 A means that you weld thick plate, load bearing sections and large frames for hours without the thermal breaks that stop lighter equipment. You set the welding voltage from 10 to 39 V, at 400 A it runs at 34 V and at 380 A at 33 V. The efficiency of the source is 87% and the power factor 0.9, so at full load the machine loads the mains calmly for this current class.
The build is split. The source of 35 kg and dimensions 590 x 230 x 430 mm stands with the cooler on a transport trolley, and you work with the feeder on an interconnection package about 10 m long. You take it onto a structure or walk around a semi trailer without moving the whole set, which matters on repairs of farm and construction machines and on large frames. The interconnection package carries the current cable, the control cable, the coolant hoses and the gas hose in one sleeve, so one bundle is laid out in the hall instead of five separate cables.
The SF 53 MLS panel handles the manual mode and the synergic 1-MIG mode. In the synergic mode you enter the material, the wire diameter and the gas, and the circuit ties the feed speed to the voltage, so you change the power with one knob and correct the arc length with the other. In the manual mode you go back to separate, stepless adjustment of both parameters, when the technology calls for it. Ten memory channels hold approved parameters, so at a change of thickness or welding position you go back to them in one move, and the second shift works on the same settings. During welding the display shows the real voltage and current, so you see whether the process stays inside the technological window. This is a layout for station production with solid and cored wires, and after the feeder is changed over, also for aluminium.
Features and equipment
- The synergic SF 53 MLS panel is mounted on the feeder, so you have all the settings with you, without walking to the source.
- Manual MIG/MAG mode with separate, stepless adjustment of wire feed and voltage.
- 1-MIG synergy with curves for carbon steels, CrNi stainless steels, cored wires and aluminium in the AlMg5 and AlSi5 grades.
- Arc dynamics adjustment from minus 9 to plus 9: negative values give a soft arc, a smoother bead and less spatter with Ar and CO2 mixtures, positive ones harden the arc and improve penetration with 100% CO2.
- Creep Start, that is a soft start: the wire moves more slowly until the strike, so it does not hit cold material and does not throw metal about.
- Crater Fill, that is crater filling: the current falls gradually at the end of the bead, so crater cracks do not form in thick sections.
- Ten separate memory channels for ready programs for a plate thickness, a wire type or a fillet weld.
- The display shows the real voltage and current during welding, so you see what is really happening in the arc.
- MSF 55 feeder with a four roll DuraTorque drive, which carries the wire without slip also with a long torch.
- A closed spool housing on the feeder protects the spool from dirt in the hall.
- The interconnection package joins the current cable, the control cable, the coolant hoses and the gas hose in one sleeve.
- FastCool 10 cooler of 1.0 kW with a tank of about 3 l, which lowers the temperature of the torch handle when you weld above 300 A.
- MMA mode handled by the source from 10 to 400 A, once you buy an electrode cable.
- Original transport chassis for rolling the whole set around the workshop.
- Wire feed speed from 0 to 25 m/min, for thin sheet and for thick welds.
- The feeder carries steel wires from 0.6 to 2.4 mm and cored wires from 0.8 to 2.4 mm.
- A spool of up to 300 mm diameter and up to 20 kg, so you break off work to change wire less often.
- An efficiency of 87% and a power factor of 0.9 at work with full current.
- MIG/MAG welding voltage from 10 to 39 V, at 400 A it is 34 V and at 380 A it is 33 V.
- Source dimensions 590 x 230 x 430 mm and a weight of 35 kg, so it fits on the trolley together with the cooler.
Technical data
| Brand | Kemppi |
|---|---|
| Type | inverter MIG/MAG welder, split set |
| Supply | 3 x 400 V, 50/60 Hz |
| Mains fuse | 35 A time delay |
| Welding current at 80% | 400 A at 34 V |
| Welding current at 100% | 380 A at 33 V |
| MIG/MAG welding voltage range | from 10 to 39 V |
| Efficiency and power factor | 87% and 0.9 |
| Source dimensions | 590 x 230 x 430 mm |
| Source weight | 35 kg |
| Feeder | MSF 55, four rolls, speed from 0 to 25 m/min |
| Wire diameters | steel from 0.6 to 2.4 mm, cored from 0.8 to 2.4 mm |
| Maximum spool | diameter 300 mm, up to 20 kg |
| Cooler | FastCool 10, power 1.0 kW, tank about 3 l |
| Panel | SF 53 MLS, 1-MIG synergy, 10 memory channels |
| Interconnection package | about 10 m |
| MMA range | from 10 to 400 A |
What you get
- Kemppi FastMig KMS 400 source
- MSF 55 wire feeder
- interconnection package about 10 m
- FastCool 10 cooler
- SF 53 MLS synergic panel
- extra equipment: MIG/MAG torch, liquid cooled, about 4 m, earth cable about 4 m, supply cable 3 m, transport trolley
What to watch out for
The supply is 3 x 400 V at 50/60 Hz, with a 35 A time delay fuse, so the connection has to carry the start-up and work at full current. The FastCool 10 cooler has a power of 1.0 kW and a tank of about 3 l: check the level and the cleanliness of the fluid, because when you weld above 300 A it is the cooler that protects the torch handle. The feeder carries steel wires from 0.6 to 2.4 mm and cored wires from 0.8 to 2.4 mm on spools up to 300 mm in diameter and 20 kg in weight, and the feed speed reaches 25 m/min. A spool of 20 kg adds weight to the feeder itself, so when you work on a structure consider a smaller reel.
The SF 53 MLS panel has no licence for pulse processes, so you will not set a pulse or a double pulse here. For the MMA mode, which the source handles from 10 to 400 A, you buy an electrode cable, because it is not in the set. Aluminium calls for a changeover: rolls with a U shape, a PTFE liner in the torch and argon shielding, because the set is prepared for steel wires. We do not add a gas cylinder, a regulator or wire. Before dispatch you can arrange with us a test of the set under load, to see the settings in action. The set has visible scratches and rubs on the housing after industrial work.
How we sell used machines
This unit was checked in our service workshop in Krotoszyn with measurements to PN-EN 60974-4 and a load test. The price includes the first year of the basic service package: an inspection with cleaning of the machine and a validation measurement. Further years can be added. We ship across the European Union, collection in person by appointment.
