Fronius TTW3000 TIG Torches FAQs
Answers for buyers choosing and running a high-current, water-cooled manual TIG torch, including long hose packs and flexible-body versions.
Why choose a water-cooled TIG torch rather than an air-cooled one?
Water-cooled torches are designed for high-amperage work and long weld times. One major maker recommends a water-cooled torch for shop TIG jobs at 300 amps or more, though the right choice depends on the work and the torch ratings.
A water-cooled torch can also be smaller and lighter at the same current rating, and its cable is lighter and more flexible, which helps reduce operator fatigue over a long day. The trade-off is that you need a cooling unit and coolant to look after, so air-cooled can still make sense for lower-current, intermittent work.
How do I know the torch is rated for the amperage and duty cycle I need?
Check the maker's rating for the torch. Duty cycle is the percentage of a 10-minute period that the torch can be operated at a specific output, and running above the rated output lowers the duty cycle and heats the handle and cable faster.
Water-cooled torches are generally chosen for high current and long arc-on times, but the safe figure depends on the model, the coolant flow and the temperature. Treat the data plate and manual as the authority, and choose a torch with some margin over the current you plan to use.
Which tungsten should I use for AC and DC work on this type of torch?
For DC welding of steel and stainless steel, ceriated or lanthanated electrodes are generally considered acceptable, and zirconiated electrodes are generally preferred for AC. Choose the diameter to suit the current, and make sure the collet and collet body match.
It is worth considering whether thoriated electrodes are justified over these alternatives, because thoriated electrodes are slightly radioactive and grinding them creates hazardous dust. Follow the electrode maker's advice for current range, and use local extraction when grinding.
What does a gas lens do, and is it worth fitting to a high-current torch?
A gas lens replaces the standard collet body and has fine layered screens that remove turbulence and give a smoother, laminar stream of shielding gas. Turbulent gas can draw air containing oxygen into contact with the weld pool, so a smoother flow gives better coverage, and it often lets you run a little more tungsten stick-out in tight joints.
It needs the matching cup and collet body for your torch. Spatter can stick to or melt the screens and disrupt the flow, so keep it clean and replace it when worn or clogged. Check the torch manual for compatible parts, because fit differs between torch designs.