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.
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.
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.
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.