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A517 Furick No.5 Ally Pyrex Cup Kit for 2.4mm (1x cup, 1x collet body, 1x split collet, 1x heatshield & 2x O-rings)
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    Rapid Ref : A517  

    Furick No.5 Ally Pyrex Cup Kit for 2.4mm (1x cup, 1x collet body, 1x split collet, 1x heatshield & 2x O-rings)
    A517

    £24.99  EX VAT

    Includes one Pyrex cup mounted on a collet body with a 2.4mm measurement diameter with a slit style collet (also in 2.4mm diameter), a heatshield and 2 O-rings. 

    This kit is designed for 17 and 18 size TIG torches and can also fit onto size 26, but welders may have to run without the use of an insulator due to the complexities of different measurements. The Ally No.5 brand of Pyrex cups is of AC/DC polarity and has an amperage rating of 200.

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    Furick 3 Series TIG Parts FAQs

    Cups, collets, gas lens parts and kits for a larger-style TIG torch: how to match them to your torch and tungsten, and how to look after them.

    How do I choose the right cup size?icon-minus-redicon-plus-red

    A larger cup gives a wider, steadier flow of shielding gas and so broader coverage, while a smaller cup reaches tight joints but speeds the gas up, which can cause turbulence. Choose the largest cup the joint access allows.

    Cups are normally numbered by opening size, in sixteenths of an inch, so a bigger number means a wider cup. Metals that need careful gas cover, such as stainless steel, usually benefit from a wider cup, often with a gas lens. Make sure the cup is the style made for your torch and for either a standard collet body or a gas lens.

    How far can the tungsten stick out of the cup?icon-minus-redicon-plus-red

    Keep the stick-out as short as the joint allows. A common workshop rule of thumb is that the tungsten should not stick out past the cup by more than somewhere between half and the full inside diameter of the cup, but this is a guide, not a standard. A long stick-out is a recognised cause of poor shielding, and the usual fix is to reduce it or fit a larger cup.

    A gas lens gives a smoother column of gas, so it tolerates a longer stick-out and helps in corners and tight access. Whatever you choose, check the weld for discolouration or porosity and follow the torch maker's guidance for your set-up.

    How do I set the gas flow when I change cup or fit a gas lens?icon-minus-redicon-plus-red

    Use the lowest flow that gives good cover for your joint and conditions, because too high a flow causes turbulence and can draw air into the shield, leading to porosity. A larger cup generally needs more gas to fill it than a small one.

    Start from the guidance in the torch and welding power source manuals, then adjust for the material, joint and any draughts. Long gas hoses can cause a surge of gas at arc start, so a suitable pre-flow time helps. Discoloured or porous welds are a sign that coverage is wrong.

    How do I match the collet, collet body and tungsten size?icon-minus-redicon-plus-red

    The collet and the collet body or gas lens must suit the diameter of the tungsten electrode. Maker parts lists and kit tables are organised by tungsten size for this reason.

    Work from the tungsten you will use. A 2.4 mm electrode, for example, needs a 2.4 mm collet and a matching collet body or gas lens. If you change electrode diameter, change the matching parts too. A worn ordinary split collet can twist or jam, and a wedge-style collet is the maker's suggested answer for short collet life, so ask if one is made for your torch.

    See all 6 questions for this category

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