The Kemppi MasterTig 4000 MLS is an inverter TIG power source for direct current, with an MMA mode. The current reaches 400 A, and the duty cycle at a temperature of 40 °C is 400 A at 30%, 310 A at 60% and 285 A at 100%. The supply is 400 V three phase with a tolerance of 10%, and the housing has protection class IP23S.
What this machine is for
This is a power source for carbon and stainless steels in industrial production. A reserve of 400 A lets you work on process lines, on stainless steel vessels and reactors, on heat exchangers and boiler tubes in power plants and on marine pipelines. A stable arc at very low currents sorts out the welding of thin tubes, and the upper range pulls thicker walls. You will not weld aluminium with this model, because the output is direct current only, and light alloys need an AC/DC power source.
The design rests on an inverter with IGBT transistors. The high switching frequency lowers the power losses and the size of the transformer, and the controller reacts to changes in the arc column fast enough for the process to stay stable also when the supply voltage swings. The ICS housing leads the cooling air only through the heat sinks of the power blocks, past the control boards, so grinding dust and moisture do not settle on the electronics.
The MLS system lets you change the control panel, for example MTM or MTX, without going deep into the power source. That way you match the interface to the person who works at the machine: from simple current settings to pulse parameters and channel memory. The range of functions therefore depends on the panel that sits in the given unit.
Features and equipment
- Inverter on IGBT transistors: a fast reaction of the controller to changes in the arc and lower power losses than in transformer designs.
- ICS housing, that is an isolated cooling system: the air goes through the heat sinks of the power blocks and passes the control boards, which shields them from dust and moisture.
- Protection class IP23S: work outside the hall, also in rain falling at an angle up to 60 degrees, with the cooling cycle kept.
- MLS system: interchangeable MTM and MTX control panels with no work inside the power source, with steady communication between the power source and the control torch on long lines.
- Minilog function: with a button in the torch you switch between two programmed current levels while the arc burns, which helps when the material thickness changes, in forced positions and in edge welding.
- HF ignition: a start with no contact, with no risk of a tungsten inclusion in the weld, which is a condition on pipelines that go for radiographic testing.
- Lift-Arc ignition: a start by scratching, for places sensitive to electromagnetic interference.
- Pulsed TIG with the MTX panel: current modulation narrows the arc and limits the heat affected zone, which lets you reach deep fusion with little distortion of a thin wall.
- MMA mode: the covered electrode on the same power source, for repair work.
Technical data
| Brand | Kemppi |
|---|---|
| Type | inverter TIG DC power source with an MMA mode |
| Supply | 400 V with a tolerance of 10%, 3 phases, 50 or 60 Hz |
| Maximum welding current | 400 A |
| Duty cycle 30% at 40 °C | 400 A |
| Duty cycle 60% at 40 °C | 310 A |
| Duty cycle 100% at 40 °C | 285 A |
| Protection class | IP23S |
| Control panels | MLS system, MTM or MTX panels |
| Recommended cooler | Kemppi MasterCool 10 |
| Current type | DC |
| Cooling | liquid |
What to watch out for
The supply is 400 V three phase with a tolerance of 10% at 50 or 60 Hz. A 30% duty cycle at 400 A gives three minutes of welding in a ten minute window, 310 A lets you work for six minutes, and with no limit you weld at 285 A. The values are given for an ambient temperature of 40 °C.
The torch is liquid cooled, the documentation points to the MasterCool 10 cooler controlled from the power source, so confirm whether it comes with the machine and check the flow before the start. The range of functions depends on the panel: TIG pulse works with the MTX panel, the MTM panel gives simpler settings, so before you buy check which panel sits in this unit.
This unit is sold
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