A TIG torch has only a few front-end parts, but each one affects arc stability and gas coverage. Using the right combination makes cleaner welds and saves tungsten.
Tungsten electrode
The tungsten carries the arc and is not consumed like a MIG wire. A thoriated tungsten electrode is a common choice for DC welding of steel and stainless. A pure tungsten electrode is traditionally used for AC welding of aluminium. Grind the tip lengthwise to a point for DC work; a tungsten grinder gives a consistent angle and keeps grinding dust contained.
Collet and collet body
The collet grips the tungsten and the collet body holds the collet and passes gas to the cup. Both must match the tungsten diameter. A worn collet lets the tungsten slip and causes poor current contact.
Alumina cup
The alumina cup shapes the shielding gas around the arc. Larger cups give wider gas coverage; a long alumina cup helps reach into narrow joints. Replace cracked or chipped cups straight away, as they disturb gas flow.
Gas lens
A gas lens replaces the standard collet body and uses a fine mesh to smooth the gas flow. This lets you stick the tungsten out further with good coverage, which is useful on corners and stainless. Use it with a gas lens cup and gas lens gasket.
Back cap and seals
The back cap closes the rear of the torch and holds the tungsten in place. Choose a short, medium or long back cap to suit your access and tungsten length. Check the gas gasket too: a missing seal lets air get drawn into the gas stream.
TIG parts in Singapore
Fong Yung Industries LLP stocks tungsten, collets, cups, gas lenses and complete TIG welding torches in the EVO-TIG range. Browse the range or request a quote.