CK17 Accessories FAQs
Answers to common questions about TIG torch accessories: consumable kits, gas lenses, cups, switches, cable covers and looking after them safely.
What is a gas lens kit and why would I use one?
A gas lens is a special collet body and cup that holds a fine mesh screen. The screens create a more uniform, smooth flow of shielding gas, with less turbulence than a standard collet body. Because the flow is more even, good gas coverage can usually be achieved with less gas, and it is often recommended for critical or high-quality welds.
It also allows the tungsten to extend farther than a standard collet body does, which helps with access to joints.
Gas lens parts must match your torch family and tungsten size, and the best settings depend on the job, so test on scrap first.
How far should the tungsten stick out of the cup?
There is no single figure. Stick-out depends on the cup size, whether you use a gas lens, the joint access and the gas flow. With a standard collet body, the usual guidance is to keep the tungsten extension within the inside diameter of the nozzle. A gas lens allows the tungsten to extend farther than that.
Keep stick-out as short as the joint allows, because more stick-out makes gas coverage weaker. A longer nozzle gives the gas more room to settle before it leaves the cup.
A stick-out gauge helps you set it consistently. Follow your torch maker's guidance and your welding procedure.
How do I choose the cup size?
Use the correct tungsten and cup size for the joint. A larger cup gives a wider, longer smooth column of gas and better shielding, so choose the largest diameter and longest length that the joint will allow. Smaller cups suit tight spaces or small parts, but they raise the gas velocity, which can cause turbulence.
Cup sizes are commonly numbered, so check the sizes your torch family accepts and make sure any gas lens uses matching cups.
It helps to keep a few sizes to hand so you can change cup to suit the joint and the current.
Should I use a torch switch or a foot pedal?
A torch switch is basically an on/off control: the current you get is whatever is set on the machine when you press it. A foot pedal gives continuous control of the current while you weld, which suits thin material and precise bench work, and it avoids having to move the torch to change amps.
A switch is simpler and handy for tacking, thicker parts and awkward positions where a pedal cannot be used. A pedal is best suited to working seated at a welding table.
Check that your machine has a remote socket and that the plug matches it, as they vary between makers.