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 choose the right tungsten diameter?
Match the diameter to the current you will use. A larger diameter is used for higher amperage jobs, while a smaller diameter makes arc starting easier at very low amperage settings. A 2.4 mm (3/32 inch) electrode is often suggested as a general-purpose size, covering light sheet through to thicker metal.
The current range for each diameter depends on the electrode type and on whether you weld AC or DC, so follow the electrode maker's chart. Make sure the collet and collet body match the diameter you fit, as the parts are made for specific sizes.
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.
Does a higher argon flow rate give better shielding?
Not necessarily. Turbulent gas flow can draw air containing oxygen into the weld pool, so too much flow, or a small cup running at high flow, can cause porosity and discolouration. Draughts also disturb the shield.
There is no single flow figure that suits every job. Start from the torch maker's and the welding procedure's guidance, adjust with test welds, use a gas lens if you need smoother flow, and shield the work from draughts.