In MIG/MAG welding the torch heats up continuously from the arc and the high current flowing through it. How this heat is removed directly determines which jobs a machine is suited for.
Air-cooled systems
In air-cooled torches, heat is removed by the shielding gas flow and the surrounding air. They are simple, need no additional unit and are easy to maintain.
- Ideal for low and medium current applications.
- Lighter and more economical.
- Sufficient for intermittent workshop welding.
Water-cooled systems
In water-cooled systems, a cooling unit built into the machine pumps coolant in a closed loop to the torch; the coolant absorbs heat as it passes through the torch and is cooled in a radiator. On the Eurotech Varyolu 405A, 450A and 500A water-cooled models this is handled by the SW20 water-cooling unit.
- Allows long, uninterrupted welding at high current.
- The torch stays cooler, extending the life of contact tips and gas nozzles.
- The torch body can be slimmer and lighter, reducing operator fatigue.
Which should you choose?
| Criterion | Air-cooled | Water-cooled |
|---|---|---|
| Current class | Low – medium | Medium – high |
| Operation | Intermittent | Long seams, multi-shift production |
| Consumable life | Standard | Longer |
| Maintenance | Very simple | Coolant checks required |
Water-cooling unit maintenance tips
- Check the coolant level regularly using the Min–Max gauge on the tank.
- In winter, use a suitable antifreeze coolant to prevent freezing.
- Check hose connections for leaks.
- Clean the radiator fins periodically of dust and metal particles.
