How To Set A Cutting Torch

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• Piece of work Area
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• Setup
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• Cutting

An oxy-acetylene torch, besides known equally a blow torch, is a unsafe cutting system, simply information technology'south also a powerful and useful tool if y'all need to cut steel. By creating a safe work environment and carefully monitoring the force per unit area of the oxygen and acetylene, you tin apply an oxy-acetylene torch for whatsoever number of projects!

1. 1

   Wear fire-retardant clothing and heavy leather-soled boots. Do not habiliment loose-fitting clothes, clothes made from flammable synthetic materials, or article of clothing with frayed or torn edges that may ignite more than easily than tightly-woven, clean-hemmed garments.^[1]

   • Fire-retardant vesture is recommended simply, if that isn't available, article of clothing close-plumbing equipment cotton wool clothes. Nylon and most other common synthetic clothes will quickly burn if caught on burn down!
   • Sturdy, leather-soled work boots are recommended. Hot pieces of metal, called slag, can hands fire through rubber-soled shoes. Laced boots are preferable since slag can drop into the meridian of pull-on boots, like engineer's boots and cowboy boots.
   • You should also take a set of cutting goggles and heavy leather gloves.

2. two

   Have a fire extinguisher on manus. For virtually projects, a compressed air and water extinguisher will work, simply if oil, plastics, or other combustible materials are around, an "ABC" extinguisher is recommended. It's likewise a good idea to have another person continuing nearby who can alert you if something catches fire.^[two]

   • Flight slag can easily cause a fire in your workspace, then examination your burn extinguisher to ensure it's in proficient working order before you start cut.

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3. 3

   Ensure your workspace is free of flammable materials. Working on bare globe or a physical slab is highly recommended since sparks are going to wing many anxiety from the cutting location. Dry out material similar paper, sawdust, cardboard, and dried institute foliage or grass can be ignited from fifteen feet (4.6 grand) or further.^[three]

   • Do not allow the flame to contact concrete, peculiarly fresh concrete, as it may cause it to aggrandize and crack violently, sending small bits of physical flying.

4. 4

   Gear up up the project on steel supports at a comfortable working superlative. A steel table is ideal since you can caryatid yourself to steady the torch. Never utilise a surface that is flammable, like a wooden table, or one that has had flammable materials spilled on it.^[4]

   • As well, beware of material that has metal oxide coatings, such equally lead pigment, chromate primers, and zinc plating, since inhaling the fumes from these can be toxic.

5. v

   Mark your cuts with a soapstone marking. If you need a more than precise cut, measure out a little extra space so you tin can grind your cut. You may use a permanent marker if a soapstone is non available, just the mark will tend to disappear only ahead of the torch flame.

   • For very precise cuts, you may get meliorate results past using a specialized jig to etch the line into your work surface.

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1. i

   Hook upwardly the gauges to the appropriate tanks. The hoses from your torch should adhere to the nozzles on the oxygen and acetylene tanks. Typically, oxygen tanks and hoses are green, and acetylene hoses are red. The hoses are usually paired together, and the ends are separated so they tin can attach to their respective tanks. The acetylene hose will have reversed threads and a male person fitting to brand information technology easier to tell them autonomously.^[five]

   • Since the fittings are made of brass and can hands be damaged, tighten them with an appropriately-sized wrench.

2. two

   Brand sure the acetylene regulator is turned off. To check that the regulator is completely off, dorsum the tee handle out a few turns. This handle volition be on top of the tank right next to the regulator valve. This will aid ensure that you have consummate command over the acetylene gas force per unit area.^[vi]

   • At higher than fifteen psi (100 kPa), acetylene becomes unstable and may spontaneously ignite or explode.

3. three

   Open the gas valve on elevation of the acetylene tank with one turn of the wrist. Over again, it's extremely of import to maintain control over the catamenia of the acetylene, so yous desire to open the gas valve just enough to permit a constant, steady menstruation of the gas.^[seven]

   • Opening the tank more than a single turn could pb the gas to become unstable, and it volition exist harder to turn off in the case of an emergency.

4. 4

   Open up the regulator valve by turning the tee handle clockwise. This is the same handle that you closed earlier opening the gas valve. You should open up this very slowly, and yous should constantly monitor the low-force per unit area approximate while you're opening the valve. Open up it only until the force per unit area indicated is between 5–8 psi (34–55 kPa).^[viii]

5. 5

   Open the gas valve on the torch handle to vent it. To vent the atmosphere from the acetylene hose, open the gas valve on the cutting torch handle until you lot hear gas escaping, and then observe the low-pressure level judge to run into if the pressure level remains steady during flow and ensure that you lot have this regulator set up correctly.

   • Shut the acetylene valve on the torch once you are sure the pressure is regulated..

6. vi

   Turn the oxygen regulator off, so open the chief oxygen tank all the style. In the same manner that y'all closed the acetylene regulator, back the oxygen regulator gauge out a few turns. Once you've washed that, turn the handle on the main oxygen tank so information technology's all the fashion open.^[nine]

   • The setup on top of the oxygen tank will be similar to that on the acetylene tank.
   • The oxygen valve is a double-seated valve. When you open information technology, be certain to turn the handle and then the valve is all the way open. Otherwise, the oxygen will leak out effectually the valve-stem O-ring.

7. vii

   Open up the oxygen regulator valve slowly. Just like with the acetylene regulator, you'll turn the tee handle very slowly, watching the low-force per unit area approximate equally yous practise then until the pressure level reads betwixt 25–forty psi (170–280 kPa).^[ten]

8. 8

   Open and shut the oxygen valve on the torch to vent the atmosphere. There are 2 valves on the oxygen side of the cut torch associates. To begin with, open the valve closest to the hose several turns to ensure sufficient oxygen is bachelor for both functions. Next, open the forrad valve slightly until the hose is purged (about three-5 seconds for a 25 anxiety (vii.half-dozen thousand) hose), then close the forward valve.^[11]

   • The valve near the hose connections will control the period of oxygen to the mixing chamber for the combustion, so no oxygen should vent from the torch tip until either the cutting lever is depressed or the valve further upward the torch is opened.

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1. 1

   Put your gloves and goggles on earlier lighting the torch. When it comes to working with an acetylene-oxygen torch, y'all can never exist too conscientious. Put on all of your safe equipment and check your work area i more time for combustible materials.^[12]

2. 2

   Light the torch with a striker. Open up the acetylene valve again, allowing the oxygen remaining in the mixing sleeping accommodation to purge for a few seconds, then shut the valve until you lot can barely hear gas escaping. Hold your striker in front of the torch tip and squeeze the handle.

   • A small xanthous flame should appear at the tip when the sparks from the striker ignite the acetylene.
   • Using matches or a cigarette lighter is very dangerous. A striker is a tool made particularly for igniting torches, and using one reduces the risk of serious injuries.

3. 3

   Adjust the acetylene valve until the flame is about ten in (25 cm) long. Make sure the flame begins at the torch tip. If the flow of acetylene is too strong, the flame volition "jump", or exist blown away from the tip. This can lead to an unpredictable cutting edge, which may increase your adventure of fire or injury.^[13]

4. 4

   Turn the forward oxygen valve on slowly. The flame color will turn from yellow to light blue with a white center as sufficient oxygen is supplied to completely combust the acetylene. Increment the oxygen slowly until the inner blue flame begins to shrink back toward the tip.^[fourteen]

5. 5

   Open the oxygen valve more to increment the flame size. The length of the inner flame should be just over the thickness of the steel you are intending to cutting. For instance, a ^one⁄₂  in (i.3 cm) inner flame is about right for a ⁱⁱⁱ⁄_viii  in (0.95 cm) cold-rolled plate or mild steel.

   • If you hear a bravado noise, or the blue flame seems erratic and feathery, there is probably also much oxygen at the flame. Reduce it until the flame is stable and the inner flame is a clean cone shape.

6. 6

   Bring the tip of the inner flame near the surface you are going to cut. The flame doesn't have to sit directly on the surface to cutting it. You lot will need to heat the steel with this flame until a molten puddle of metal forms and luminesces at this location. Keep the tip of the flame steady and almost ³⁄₈  in (0.95 cm) from the metal's surface to concentrate the heat in one location.^[fifteen]

   • For room-temperature ¹⁄_four  in (0.64 cm) plate steel, this should take about 45 seconds. However, it will take longer for heavier material or textile at depression temperatures.

7. 7

   Push the cut valve handle downward slowly to release the oxygen jet. This will ignite the molten steel. If a vehement reaction instantly starts, the steel has ignited, and you can gradually increase pressure until the jet is cutting completely through the metal.^[sixteen]

   • If no reaction occurs, the metal is not hot enough to ignite. In this example, release the oxygen handle release and proceed to allow the flame to heat the metallic more.

8. 8

   Brainstorm moving the torch tip slowly along the line of your cut. One time the jet is cut through the steel, get-go moving the torch along the line y'all drew. Y'all should observe that well-nigh all of the sparks and molten slag are being blown out the back or bottom of your cut. If this flow of superheated fabric slows or backs up, slow your forward speed or stop and allow the metal heat more.^[17]

   • It's better to cut likewise slowly than to endeavor to cut too speedily.

9. 9

   Continue cutting until you lot have parted the metal or finished the cut. Make sure the slag and any droplets of heated metal do not become underfoot. Even sturdy boot soles will burn through if you find yourself continuing on a large piece.^[18]

10. 10

    Turn off the torch in the contrary order of how you lot turned information technology on. Beginning, plough off the torch valve, then plow off the oxygen. Next, plough off the cylinder valves on the oxygen tanks and back out the regulator pressure screw. Echo this for the acetylene tank.^[xix]

    • Some models may instruct y'all to plow off the oxygen before turning off the torch valve. In this case, always defer to the manufacturer'south instructions.

11. xi

    Cool the workpiece with plenty of water. All the same, you should be aware that dipping a superheated piece of steel into a bucket or stream of cold water will create an instantaneous cloud of very hot steam.^[20]

    • You could besides permit it to absurd naturally if y'all aren't in a hurry.
    • If you lot're using quench- or temper-type steels, permit the steel to cool naturally, as water could cause them to warp.

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Add New Question

• Question

  When finished using the cut torches, how do I shut everything off? When I am finishing using the torches, exercise I dorsum the regulators off or leave them in at the operating pressure?

  

  If you're going to be using them within the same day, it's fine to leave them at operating force per unit area, merely it is best to close everything off (tank valves off showtime) and purge your hoses and regulators. Once y'all're done for the day, just open the valves on the torch i at a fourth dimension until you lot tin can't hear any gas flow, close them back up, then close up your regulators to preclude any regulator shock when y'all adjacent open up upwards the tanks.

• Question

  What is the right way to shut down a cutting torch?

  

  Most manufacturers recommend shutting off the the fuel torch valve first, then the oxygen torch valve. And so close both the oxygen and fuel tank valves. Adjacent, open up the acetylene torch valve to drain the fuel until the line and tank force per unit area gauges read zippo, and then shut the valve. Repeat this step with the oxygen torch valve.

• Question

  What do you do if you are afraid to cut with a torch?

  

  Take someone else exercise the cut or inquire for further pedagogy until you comfortable enough to try. It is not difficult with the proper preparation.

• Question

  Will an oxygen regulator (that is connected to an opened cylinder but not with a hose) leak through to atmosphere, assuming the T handle is backed completely out?

  

  They're not supposed to bypass, but sometimes practice. You may need a new regulator.

• Question

  Why should cutting torch cylinders exist kept well ventilated?

  

  This is in case the cylinder has a leak, acetylene is one of the most volatile gases know to man.

• Question

  My torch tip fills with carbon. What is the problem?

  

  You are holding the tip also shut. Concord it no closer than the width of your blue flame at the tip. Likewise, if you're bravado a starting hole, hold the torch up and away from your work but before y'all hit the oxygen.

• Question

  Why can't I cut aluminium or stainless steel with a torch?

  

  It works past oxidizing the piece of work piece extremely fast to cut through it, if it doesn't rust y'all can't cutting it.

• Question

  Reverse to pictures 3 and 4, shouldn't I adjust the O2 and fuel gas ratios for the desired flame with the torch valves, not the cylinder valves?

  

  Yes, this is correct.

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• Brand sure all hose connections, approximate/regulator fittings, and other attachments are tight. Leaking gas at these fittings can produce an instant fire.

• E'er transport gas cylinders in a vertical (upright) position.

• Proceed animals and children away from areas where this blazon of hot work is existence washed.

• Keep the torch tip clean.

• Accept flashbacks installed on both ends; it's much safer than simply 1 fitted.

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• Having a fire sentry is required on OSHA-regulated projects.

• Using a blow back or back catamenia preventer is highly recommended.

• Steel and carbon steel are the merely materials yous should effort to cut. Aluminum, stainless steel, and other metals and alloys cannot be cut with a cutting torch.

• Use a cutting torch but in a well-ventilated area, abroad from flammable materials.

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Things You'll Demand

• Cut torch prepare, with fuel and oxidizer tanks.
• Fire extinguisher
• Striker
• Marking and measuring tools
• Cutting goggles
• Heavy leather gloves
• Close-plumbing equipment, not-flammable clothing

About This Article

Article Summary X

To employ a cutting torch, start put on burn down-retardant clothes, gloves, and goggles. Next, light the torch past holding the torch tip against the striker. Once yous've adjusted the flame size to the correct length, move the flame to the steel y'all want to cut and button on the cutting valve handle slowly. This causes the molten steel to ignite. To make your cut, move the torch tip slowly along the line of your cut until the metal has fully parted. Go along reading to larn how to fix your workspace and properly set up your cut torch.

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Source: https://www.wikihow.com/Use-a-Cutting-Torch

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