Rehm Invertig 400 GW in the GKS ALU-WIG 4000 AC/DC build is an industrial inverter TIG AC/DC and MMA power source, with a built in liquid cooling module and an aluminium current control pedal. You set the current from 8 A to 400 A, and in TIG the machine gives 400 A at 26.0 V and a 60% duty cycle and 335 A at 23.4 V in continuous work at 100%. The supply is 3 x 400 V at 50 Hz, the power factor is 0.97.
What this machine is for
On alternating current you weld aluminium and the AlSi and AlMg casting alloys, and magnesium alloys as well, because the positive half wave breaks the layer of aluminium oxide on the surface. On direct current, in both polarities, you work on CrNi stainless and acid resistant steels, non alloy, boiler and structural steels, copper, brasses, titanium and nickel alloys. A load rating of 335 A at a 100% duty cycle means you run long butt and fillet joints in thick wall aluminium without breaks to cool the power block.
The MMA mode covers direct and alternating current in a range from 8 A to 400 A, with a load rating of 400 A at a 30% duty cycle, 335 A at 60% and 280 A in continuous work at 100%. This band lets you pull thick rutile and basic electrodes and electrodes for hardfacing and rebuilding, so one power source handles both precise TIG and heavy work with an electrode.
The aluminium control plate, that is a foot pedal in chequer plate, changes the current during welding from the start value to the maximum set on the panel. In rebuilding machine parts and injection moulds this is the basic tool: you go down with the current at the edge of the part, add at a change of wall thickness and close the crater without lifting the torch. The front panel has independent potentiometers for the time parameters and status diodes BETRIEB for operation, WASSER for cooling and TEMPERATUR for thermal protection.
Features and equipment
- AC balance adjustment: you set the proportion between the cleaning phase, that is the positive half wave, and the penetration phase, that is the negative one. A larger share of the negative half wave narrows the arc, deepens the penetration and protects the tungsten electrode from overheating, a larger share of the positive one removes oxides from oxidised castings more effectively.
- TIG Puls with independent setting of the main current I1 and the base current I2: you also pick the frequency and the length of the pulse, so you lower the average heat input, narrow the heat affected zone and keep control of the pool in fixed positions and on thin stainless steel.
- HF ignition without contact: a high frequency spark strikes the arc without touching the material, so no tungsten inclusions reach the weld.
- A contact mode with the HF module switched off: a start for surroundings sensitive to electromagnetic interference.
- A full TIG cycle ladder: gas flow before ignition, start current, up slope from 0.1 s to 5.0 s, main current, down slope from 0.1 s to 10.0 s, final crater current and gas flow after the arc goes out from 0.5 s to 25.0 s.
- 2T and 4T torch modes: 2T for short welds and tacking, 4T for long stretches without holding the trigger.
- A Bi-Level two current mode: you switch between two defined current levels during the process.
- MMA AC and DC from 8 A to 400 A: at 280 A in a 100% duty cycle you pull thick electrodes without breaks.
- A built in liquid cooling module with a tank and a pump and a WASSER lamp: the system takes heat from the torch when working at currents up to 400 A and signals a problem with the circuit.
- An aluminium control plate: foot control with smooth current modulation at a workshop station.
- An inverter build instead of a transformer with mechanical switching: the arc is steadier, the power factor reaches 0.97, and the whole current cycle is run by electronics.
- A workshop housing on wheels with a rear platform for a gas cylinder: you move the whole station without disconnecting the gas hose and the cables.
- A front panel with independent potentiometers: you set every phase of the cycle with a separate knob, without a menu.
- Signal diodes BETRIEB, WASSER and TEMPERATUR: you see the state of operation, of the coolant circuit and of the thermal protection on the front of the machine.
Technical data
| Brand | Rehm |
|---|---|
| Manufacturer from the rating plate and technical base | G. Krauthausen GmbH, Illertissen, REHM INVERTIG 400 GW platform |
| Model and machine number | ALU-WIG 4000 AC/DC, number 102019 |
| Current type | AC/DC |
| Processes | TIG AC, TIG DC in both polarities, TIG Puls, MMA DC, MMA AC |
| TIG AC/DC current range | from 8 A at 10.0 V to 400 A at 26.0 V |
| MMA current range | from 8 A at 20.0 V to 400 A at 36.0 V |
| TIG duty cycle | 400 A at 26.0 V and 60%, 335 A at 23.4 V and 100% |
| MMA duty cycle | 400 A at 30%, 335 A at 60%, 280 A at 100% |
| Open circuit voltage | 62 V DC |
| Supply voltage | 3 x 400 V, 50 Hz |
| Power factor | 0.97 |
| Current draw | about 16.5 A at 100% in TIG, 19.0 A at 60% in TIG |
| Current up slope | from 0.1 s to 5.0 s |
| Current down slope | from 0.1 s to 10.0 s |
| Gas post flow | from 0.5 s to 25.0 s |
| Cooling | liquid, built in module with a tank, a pump and a WASSER lamp |
| Welding torch | TIG type 18, 4 m, liquid cooled |
| Earth cable | about 4 m |
| Supply cable | about 4 m, 32 A CEE plug |
| Protection class, insulation class, mark | IP23, class H, marking S |
| Power source weight | from about 115 kg to 130 kg |
| Materials | AlSi and AlMg aluminium, magnesium alloys, CrNi, structural and boiler steels, copper, brass, titanium, nickel alloys |
What you get
- Rehm Invertig 400 GW power source in the GKS ALU-WIG 4000 AC/DC build, on a wheeled trolley with a cylinder shelf
- built in liquid cooling module with a tank, a pump and a WASSER lamp
- aluminium control plate, that is a foot pedal
- TIG torch type 18, 4 m long, liquid cooled
- earth cable about 4 m with a screw clamp
- supply cable about 4 m with a 32 A CEE plug
What to watch out for
The machine needs a 3 x 400 V power installation at 50 Hz, and the factory plug is made for 32 A. The draw is about 16.5 A in continuous work in TIG and 19.0 A at a 60% duty cycle. A type 18 torch usually takes about 230 A in AC and about 320 A in DC, in workshop practice up to 250 A in AC and up to 300 A in DC. For long work at the upper range of the power source, that is from 350 A to 400 A in AC, pick a torch with a higher rating, for example type 18 SC or a model in the class from 450 W to 500 W, otherwise the handle and the cables will not carry the heat away.
Before the start check the level and the cleanliness of the coolant in the cooling module, and the WASSER lamp will tell you about a problem with the circuit. The open circuit voltage is 62 V DC, so in tight and damp spaces keep to the safety rules for industrial power sources. The power source weighs from about 115 kg to 130 kg, you will roll it over a hall floor, but for transport you need a pallet truck. The housing has protection class IP23, insulation class H and the marking S.
This unit is sold
This machine has already gone to a customer. Similar units are listed below, and if you want the same model, leave your contact details in the form and we will let you know when the next one arrives.