CK230 Gas Lens Spares FAQs
Spare gas lens parts for this TIG torch: what each one does, how to pick the right one and how to look after it.
What is the difference between a gas lens set-up and a standard collet body?
A standard collet body passes the shielding gas out through a few small holes, so the flow can become turbulent as it leaves the cup. A gas lens replaces the collet body and spreads the gas through fine mesh screens, giving a smoother, more even (laminar) flow around the tungsten and weld.
The collet still holds the tungsten in both cases. A gas lens is generally chosen for demanding or high-quality work, while a standard collet body is usually fine for non-critical or practice welding.
How much further can I let the tungsten stick out with a gas lens?
With a standard collet body the tungsten is normally kept within the inside diameter of the cup. Because a gas lens gives a steadier column of gas, the tungsten can usually extend further than that, which helps with access to tight joints and gives a better view of the weld pool.
How far is acceptable depends on the cup size, the current, any draughts in your workplace and the torch maker's instructions, which often assume draught-free conditions. Build up gradually, and shorten the stick-out if the weld shows discolouration or porosity.
Do I need to change my gas flow when I fit a gas lens?
Not necessarily. Too much gas makes the flow turbulent and can pull air into the shield, while too little leaves the weld pool and hot tungsten unprotected. The usual advice is to use the lowest flow that gives good coverage for the job and conditions.
Larger cups generally need more gas than small ones, and moving air or outdoor work may need more again. Start from the torch maker's guidance, then adjust by checking the finished weld.
What parts make up a gas lens set and what does each one do?
A typical set has a gas lens body, a collet, a cup, a back cap and an insulator (sometimes called a heat shield). The collet grips the tungsten, and the back cap holds it firmly and keeps air from leaking into the torch head. The gas lens body replaces the standard collet body and passes the gas through its mesh screens. The cup directs that gas onto the weld.
The insulator fits between the body and the torch head. Check your torch manual for exactly what your set includes.