0 items in your basket
Total £ 0.00 EX VAT
MIG Gloves
TIG Gloves
Baseball Caps
Armguards
TIG Heat Blockers
Shop 55,000 Products
SERVICEDEPT.
RAPID BLOG
FEEDBACK
HIRE
This pack of replacement diffuser screens are only made to fit the Fupa No.12 cups.
To apply accurately, please moisten the inside of the glass cup, then push the diffuser inside the cup to install properly.
Questions about TIG torch gas diffusers: what they do, how to size and fit them, and how to look after them.
A diffuser, sometimes called a gas lens screen or insert, sits in the front of the torch head and breaks up the shielding gas as it flows through fine mesh. That removes much of the swirl and gives a smoother, more even column of gas over the arc and weld pool.Smooth flow matters because turbulent gas can draw air into the shield and contaminate the weld. A diffuser therefore improves coverage for a given gas flow and cup, and it lets you hold the electrode further out of the cup when the joint demands it.
Diffusers are sized by electrode diameter, so match the diffuser to the tungsten you use, together with the matching collet. A diffuser for a 2.4 mm electrode will not suit a 1.6 mm or 3.2 mm one.Also make sure it is made for your torch type and body style. Torch heads differ, so check the manual or the type marking on the head. If you weld with more than one electrode size, you need a diffuser and collet for each size, and kits that group the parts together can make that easier.
A standard collet body releases gas through a ring of small holes, which gives little control over the flow once it leaves. A diffuser forces the gas through layers of mesh first, which evens it out and reduces turbulence.In practice the diffuser gives steadier shielding on the same gas flow, and it generally allows more electrode extension. For simple practice or non-critical work a standard collet body is usually adequate, so the choice depends on the quality of weld the job needs.
The mesh is delicate. Weld spatter can stick to or melt it, and excess heat can warp or melt the outer screens. Either one disrupts the gas flow and so the shielding.Inspect the diffuser whenever you change the electrode or cup. Replace it if the mesh is clogged, bent, melted or visibly distorted, or if you see poor gas coverage such as discolouration or porosity that did not appear before. Whether you can replace only the damaged screen or the whole assembly depends on how it is made.