The Cloos Qineo Step 350 Master is an industrial MIG/MAG welder with the Master panel and a four roll wire feeder. It gives 350 A at a 60% duty cycle and 270 A at 100%, and you set the current from 40 to 350 A. The supply is 400 V three phase.
What this machine is for
This is a power source for heavy work in a steel structure plant and in a repair workshop. A current of 270 A at a 100% duty cycle lets you lay long welds without breaks forced by temperature, and 350 A at 60% gives a reserve on thicker sections. The stepped control and the transformer characteristic give a calm arc, so there is less spatter and the work after welding gets shorter.
The machine takes mild steel, stainless steel and aluminium alloys with the right fittings, that is after you pick the rolls, the liner and the tip for the filler in question. The Master panel controls the wire feed speed and the voltage, and synergy matches the parameters to the material thickness, which limits mistakes and helps hold the repeatability required on structures built to the EN 1090 standard.
On top of that comes the handling: the feed mechanism is easy to reach, you change the rolls without special tools when you change the diameter or the grade of the wire. A build based on a transformer and modular electronics is simple to service, and with used equipment that means cheaper upkeep.
Features and equipment
- Master panel: you control the wire feed speed and the voltage, and synergy sets the parameters to the material thickness and corrects the arc length while you weld.
- Four roll wire feeder: four rolls feed the wire without slip also with torches of 4 to 5 m length, which turns into a steady arc and an even weld face.
- Fast roll change: the mechanism is easy to reach, changing over to another wire goes without special tools.
- Stepped control with a transformer characteristic: a calm arc and less spatter, that is shorter work after welding.
- Tunnel flow of the cooling air: the air goes down a duct beside the electronics, so metal swarf does not settle on the boards.
- Fan run by a thermostat and solid heat sinks: the transformer works at a steady temperature, and the cooling system starts when it is needed.
Technical data
| Brand | Cloos |
|---|---|
| Model | Qineo Step 350 Master |
| Type | MIG/MAG welder |
| Maximum welding current | 350 A |
| Adjustment range | from 40 to 350 A |
| Current at a 60% duty cycle | 350 A |
| Current at a 100% duty cycle | 270 A |
| Supply voltage | 400 V, three phases |
| Wire feeder | four roll |
| Panel | Master, synergic control |
| Cooling given on the card | liquid |
| Welding current given on the card | up to 400 A |
What to watch out for
The card gives a current up to 400 A and the source description 350 A at a 60% duty cycle, so confirm the value on the rating plate. The card also points to liquid cooling, while the source description describes air cooling with a tunnel flow, so check the torch setup and the presence of a cooler before you buy. A 400 V supply needs a power socket.
For welding aluminium you need the right fittings, that is rolls for soft wire, a teflon liner and a tip for the alloy in question, so ask what is in the set. The source description does not name a torch, an earth cable or the length of the package, so confirm the contents of the set at collection.
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.
