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H2238 Harris 543 MX Shank (Medium Duty)
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    Rapid Ref : H2238  Mfr Ref : 543MX

    Harris 543 MX Shank (Medium Duty)
    543MX H2238

    £85.37  EX VAT
    SSP Suggested Selling Price = £94.83  YOU SAVE £9.46
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    Harris 543MX Acetylene FAQs

    Acetylene cutting, welding and gouging parts for a medium-duty gas torch, with practical advice on choosing and using them.

    Why do I need nozzles made specifically for acetylene?icon-minus-redicon-plus-red

    Nozzles are designed for a particular fuel gas, and each torch should be fitted with the nozzle intended for the gas in use. Acetylene gives the hottest, most concentrated flame of the common fuel gases, which is why it is popular for short cuts, piercing and thin sheet.

    A nozzle made for another fuel gas such as propane has different channel and preheat design, so do not swap them. Check the fuel gas shown in the maker's data against the gas on your torch before fitting.

    What does a cutting attachment do compared with the handle it fits?icon-minus-redicon-plus-red

    The handle, or shank, carries the gas from the hoses and holds the valves. A cutting attachment fits onto it and adds the extra oxygen route that cutting needs. A cutting nozzle uses oxygen in two ways: some is mixed with the fuel gas to feed the preheat flames, and a separate lever-controlled supply gives the cutting jet.

    The preheat flame brings the steel up to temperature, and the cutting oxygen then burns through it. Check that the attachment, mixer and nozzle you choose are specified for your handle and for acetylene.

    Why does the nozzle size affect how much acetylene I can draw from one cylinder?icon-minus-redicon-plus-red

    Acetylene is dissolved in acetone inside the cylinder. If gas is drawn off too quickly, acetone can be carried into the gas, which may make the equipment malfunction, and acetylene can also condense and drip from the torch, which is a fire risk. The rate of withdrawal should therefore be restricted to the values given in the BCGA guidance.

    Large nozzles and heating heads use a lot of gas, so check the maker's flow figures against your cylinder size. Your gas supplier can advise whether you need more than one cylinder connected, which has its own rules.

    How can I tell if my cut is good and what should I adjust?icon-minus-redicon-plus-red

    A good cut has a square edge, a smooth surface, small drag lines and no slag on the underside. Coarse drag lines or slag on the bottom edge can mean you are travelling too fast, and too little cutting oxygen pressure can also leave an uneven surface and extra slag. Too much preheat can melt the top edge, and holding the nozzle too high or too low disturbs the cut.

    Adjust one thing at a time, starting with travel speed and nozzle height, and check the nozzle is clean, undamaged and the right size for the thickness. Set the pressures from the nozzle maker's data.

    See all 6 questions for this category

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