How To Use A Cutting Torch (with Pictures) - WikiHow

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Use a Cutting Torch PDF download Download Article Co-authored by Ryaan Tuttle and Amy Bobinger, BA

Last Updated: September 30, 2025 Approved

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  • Work Area
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  • Setup
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  • Cutting
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  • Video
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  • Expert Q&A
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  • Things You'll Need
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This article was co-authored by Ryaan Tuttle and by wikiHow staff writer, Amy Bobinger, BA. Ryaan Tuttle is a Home Improvement Specialist and the CEO of Best Handyman, Inc. in Boston, Massachusetts. With over 17 years of experience, he specializes in building home service businesses, focusing on creating scalable and efficient brands. With the help of his global team, the companies have achieved over 10+ million in sales and received recognition through magazine features, and enjoy partnerships with wikiHow and Jobber field service software. Boston Magazine and LocalBest.com have named Best Handyman Boston the Best Handyman in Boston. Ryaan holds Construction Supervisor and Home Improvement Contractor Licenses. wikiHow marks an article as reader-approved once it receives enough positive feedback. In this case, 95% of readers who voted found the article helpful, earning it our reader-approved status. This article has been viewed 715,214 times.

An oxy-acetylene torch, also known as a blow torch, is a dangerous cutting system, but it’s also a powerful and useful tool if you need to cut steel. By creating a safe work environment and carefully monitoring the pressure of the oxygen and acetylene, you can use an oxy-acetylene torch for any number of projects!

Steps

Part 1 Part 1 of 3:

Work Area

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  1. Step 1 Wear fire-retardant clothing and heavy leather-soled boots. 1 Wear fire-retardant clothing and heavy leather-soled boots. Do not wear loose-fitting clothes, clothes made from flammable synthetic materials, or clothing with frayed or torn edges that may ignite more easily than tightly-woven, clean-hemmed garments.[1]
    • Fire-retardant clothing is recommended but, if that isn’t available, wear close-fitting cotton clothes. Nylon and most other common synthetic clothes will rapidly burn if caught on fire!
    • Sturdy, leather-soled work boots are recommended.[2] Hot pieces of metal, called slag, can easily burn through rubber-soled shoes. Laced boots are preferable since slag can drop into the top of pull-on boots, like engineer's boots and cowboy boots.
    • You should also have a set of cutting goggles and heavy leather gloves.[3]
  2. Step 2 Have a fire extinguisher on hand. 2 Have a fire extinguisher on hand. For most projects, a compressed air and water extinguisher will work, but if oil, plastics, or other combustible materials are around, an "ABC" extinguisher is recommended. It’s also a good idea to have another person standing nearby who can alert you if something catches fire.[4]
    • Flying slag can easily cause a fire in your workspace, so test your fire extinguisher to ensure it’s in good working order before you start cutting.
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  3. Step 3 Ensure your workspace is free of flammable materials. 3 Ensure your workspace is free of flammable materials. Working on bare earth or a concrete slab is highly recommended since sparks are going to fly many feet from the cutting location. Dry material like paper, sawdust, cardboard, and dried plant foliage or grass can be ignited from 15 feet (4.6 m) or further.[5]
    • Do not allow the flame to contact concrete, especially fresh concrete, as it may cause it to expand and crack violently, sending small bits of concrete flying.
  4. Step 4 Set up the project on steel supports at a comfortable working height. 4 Set up the project on steel supports at a comfortable working height. A steel table is ideal since you can brace yourself to steady the torch. Never use a surface that is flammable, like a wooden table, or one that has had flammable materials spilled on it.[6]
    • Also, beware of material that has metallic oxide coatings, such as lead paint, chromate primers, and zinc plating, since inhaling the fumes from these can be toxic.
  5. Step 5 Mark your cuts with a soapstone marker. 5 Mark your cuts with a soapstone marker. If you need a more precise cut, measure a little extra space so you can grind your cut. You may use a permanent marker if a soapstone is not available, but the mark will tend to disappear just ahead of the torch flame.
    • For very precise cuts, you may get better results by using a specialized jig to etch the line into your work surface.
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Part 2 Part 2 of 3:

Setup

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  1. Step 1 Hook up the gauges to the appropriate tanks. 1 Hook up the gauges to the appropriate tanks. The hoses from your torch should attach 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 can attach to their respective tanks. The acetylene hose will have reversed threads and a male fitting to make it easier to tell them apart.[7]
    • Since the fittings are made of brass and can easily be damaged, tighten them with an appropriately-sized wrench.
  2. Step 2 Make sure the acetylene regulator is turned off. 2 Make sure the acetylene regulator is turned off. To check that the regulator is completely off, back the tee handle out a few turns. This handle will be on top of the tank right next to the regulator valve. This will help ensure that you have complete control over the acetylene gas pressure.[8]
    • At higher than 15 psi (100 kPa), acetylene becomes unstable and may spontaneously ignite or explode.
  3. Step 3 Open the gas valve on top of the acetylene tank with one turn of the wrist. 3 Open the gas valve on top of the acetylene tank with one turn of the wrist. Again, it’s extremely important to maintain control over the flow of the acetylene, so you want to open the gas valve just enough to allow a constant, steady flow of the gas.[9]
    • Opening the tank more than a single turn could lead the gas to become unstable, and it will be harder to turn off in the case of an emergency.
  4. Step 4 Open the regulator valve by turning the tee handle clockwise. 4 Open the regulator valve by turning the tee handle clockwise. This is the same handle that you closed before opening the gas valve. You should open this very slowly, and you should constantly monitor the low-pressure gauge while you’re opening the valve. Open it only until the pressure indicated is between 5–8 psi (34–55 kPa).[10]
  5. Step 5 Open the gas valve on the torch handle to vent it. 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 hear gas escaping, then observe the low-pressure gauge to see if the pressure remains steady during flow and ensure that you have this regulator set correctly.
    • Close the acetylene valve on the torch once you are sure the pressure is regulated.
  6. Step 6 Turn the oxygen regulator off, then open the main oxygen tank all the way. 6 Turn the oxygen regulator off, then open the main oxygen tank all the way. In the same way that you closed the acetylene regulator, back the oxygen regulator gauge out a few turns. Once you’ve done that, turn the handle on the main oxygen tank so it’s all the way open.[11]
    • 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 it, be sure to turn the handle so the valve is all the way open. Otherwise, the oxygen will leak out around the valve-stem O-ring.
  7. Step 7 Open the oxygen regulator valve slowly. 7 Open the oxygen regulator valve slowly. Just like with the acetylene regulator, you’ll turn the tee handle very slowly, watching the low-pressure gauge as you do so until the pressure reads between 25–40 psi (170–280 kPa).[12]
  8. Step 8 Open and close the oxygen valve on the torch to vent the atmosphere. 8 Open and close the oxygen valve on the torch to vent the atmosphere. There are 2 valves on the oxygen side of the cutting torch assembly. To begin with, open the valve closest to the hose several turns to ensure sufficient oxygen is available for both functions. Next, open the forward valve slightly until the hose is purged (about 3-5 seconds for a 25 feet (7.6 m) hose), then close the forward valve.[13]
    • The valve near the hose connections will control the flow 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 up the torch is opened.
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Part 3 Part 3 of 3:

Cutting

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  1. Step 1 Put your gloves, apron and goggles on before lighting the torch. 1 Put your gloves, apron and goggles on before lighting the torch. When it comes to working with an acetylene-oxygen torch, you can never be too careful. Put on all of your safety equipment and check your work area one more time for combustible materials.[14] [15]
  2. Step 2 Light the torch with a striker. 2 Light the torch with a striker. Open the acetylene valve again, allowing the oxygen remaining in the mixing chamber to purge for a few seconds, then shut the valve until you can barely hear gas escaping. Hold your striker in front of the torch tip and squeeze the handle.
    • A small yellow 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 especially for igniting torches, and using one reduces the risk of serious injuries.
  3. Step 3 Adjust the acetylene valve until the flame is about 10 in (25 cm) long. 3 Adjust the acetylene valve until the flame is about 10 in (25 cm) long. Make sure the flame begins at the torch tip. If the flow of acetylene is too strong, the flame will “jump”, or be blown away from the tip. This can lead to an unpredictable cutting edge, which may increase your risk of fire or injury.[16]
  4. Step 4 Turn the forward oxygen valve on slowly. 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. Increase the oxygen slowly until the inner blue flame begins to shrink back toward the tip.[17]
  5. Step 5 Open the oxygen valve more to increase the flame size. 5 Open the oxygen valve more to increase the flame size. The length of the inner flame should be just over the thickness of the steel you are intending to cut. For instance, a 1⁄2 in (1.3 cm) inner flame is about right for a 3⁄8 in (0.95 cm) cold-rolled plate or mild steel.
    • If you hear a blowing noise, or the blue flame seems erratic and feathery, there is probably too much oxygen at the flame. Reduce it until the flame is stable and the inner flame is a clean cone shape.
  6. Step 6 Bring the tip of the inner flame near the surface you are going to cut. 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 cut it. You will need to heat the steel with this flame until a molten pool of metal forms and luminesces at this location. Keep the tip of the flame steady and about 3⁄8 in (0.95 cm) from the metal's surface to concentrate the heat in one location.[18]
    • For room-temperature 1⁄4 in (0.64 cm) plate steel, this should take about 45 seconds. However, it will take longer for heavier material or material at low temperatures.
  7. Step 7 Push the cutting valve handle down slowly to release the oxygen jet. 7 Push the cutting valve handle down slowly to release the oxygen jet. This will ignite the molten steel. If a violent reaction instantly starts, the steel has ignited, and you can gradually increase pressure until the jet is cutting completely through the metal.[19]
    • If no reaction occurs, the metal is not hot enough to ignite. In this case, release the oxygen handle release and continue to allow the flame to heat the metal more.
  8. Step 8 Begin moving the torch tip slowly along the line of your cut. 8 Begin moving the torch tip slowly along the line of your cut. Once the jet is cutting through the steel, start moving the torch along the line you drew. You should observe that almost all of the sparks and molten slag are being blown out the back or bottom of your cut. If this flow of superheated material slows or backs up, slow your forward speed or stop and let the metal heat more.[20]
    • It’s better to cut too slowly than to try to cut too quickly.
  9. Step 9 Continue cutting until you have parted the metal or finished the cut. 9 Continue cutting until you have parted the metal or finished the cut. Make sure the slag and any droplets of heated metal do not get underfoot. Even sturdy boot soles will burn through if you find yourself standing on a large piece.[21]
  10. Step 10 Turn off the torch in the reverse order of how you turned it on. 10 Turn off the torch in the reverse order of how you turned it on. First, turn off the torch valve, then turn off the oxygen. Next, turn off the cylinder valves on the oxygen tanks and back out the regulator pressure screw. Repeat this for the acetylene tank.[22]
    • Some models may instruct you to turn off the oxygen before turning off the torch valve. In this case, always defer to the manufacturer's instructions.
  11. Step 11 Cool the workpiece with plenty of water. 11 Cool the workpiece with plenty of water. However, 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.[23]
    • You could also allow it to cool naturally if you aren’t in a hurry.
    • If you're using quench- or temper-type steels, allow the steel to cool naturally, as water could cause them to warp.
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Expert Q&A

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  • Question What type of safety precautions do you need to take with oxy fuel? Ryaan Tuttle Ryaan Tuttle Home Improvement Specialist Ryaan Tuttle is a Home Improvement Specialist and the CEO of Best Handyman, Inc. in Boston, Massachusetts. With over 17 years of experience, he specializes in building home service businesses, focusing on creating scalable and efficient brands. With the help of his global team, the companies have achieved over 10+ million in sales and received recognition through magazine features, and enjoy partnerships with wikiHow and Jobber field service software. Boston Magazine and LocalBest.com have named Best Handyman Boston the Best Handyman in Boston. Ryaan holds Construction Supervisor and Home Improvement Contractor Licenses. Ryaan Tuttle Ryaan Tuttle Home Improvement Specialist Expert Answer Beyond the recommendations of the article, I'd say you definitely don't want to have any loose hair. So, if you have long hair, put it up in a ponytail or a bun. Also, make sure you don't have any loose clothes as well. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 0 Helpful 5
  • Question When finished using the cutting torches, how do I shut everything off? When I am finishing using the torches, do I back the regulators off or leave them in at the operating pressure? Community Answer Community Answer If you're going to be using them within the same day, it's fine to leave them at operating pressure, but it is best to shut everything off (tank valves off first) and purge your hoses and regulators. Once you're done for the day, just open the valves on the torch one at a time until you can't hear any gas flow, close them back up, then close up your regulators to prevent any regulator shock when you next open up the tanks. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 13 Helpful 20
  • Question What is the correct way to shut down a cutting torch? Community Answer Community Answer Most manufacturers recommend shutting off the the fuel torch valve first, then the oxygen torch valve. Then close both the oxygen and fuel tank valves. Next, open the acetylene torch valve to drain the fuel until the line and tank pressure gauges read zero, then close the valve. Repeat this step with the oxygen torch valve. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 15 Helpful 22
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Video

Tips

  • Make sure all hose connections, gauge/regulator fittings, and other attachments are tight. Leaking gas at these fittings can produce an instant fire. Thanks Helpful 2 Not Helpful 1
  • Keep animals and children away from areas where this type of hot work is being done. Thanks Helpful 1 Not Helpful 0
  • Always transport gas cylinders in a vertical (upright) position. Thanks Helpful 1 Not Helpful 0
Show More Tips Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement

Warnings

  • Having a fire watch is required on OSHA-regulated projects. Thanks Helpful 22 Not Helpful 8
  • Using a blow back or back flow preventer is highly recommended. Thanks Helpful 16 Not Helpful 8
  • Use a cutting torch only in a well-ventilated area, away from combustible materials. Thanks Helpful 4 Not Helpful 1
  • Steel and carbon steel are the only materials you should attempt to cut. Aluminum, stainless steel, and other metals and alloys cannot be cut with a cutting torch. Thanks Helpful 4 Not Helpful 3
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Things You'll Need

  • Cutting torch set, with fuel and oxidizer tanks.
  • Fire extinguisher
  • Striker
  • Marking and measuring tools
  • Cutting goggles
  • Heavy leather gloves
  • Close-fitting, non-flammable clothing

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References

  1. https://www.boc.com.au/wcsstore/AU_BOC_Industrial_Store/pdf/product/en_AU/Guidelines-for%20Gas-Welding-and-Cutting.pdf
  2. Ryaan Tuttle. Home Improvement Specialist. Expert Interview
  3. Ryaan Tuttle. Home Improvement Specialist. Expert Interview
  4. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  5. http://www.weldingtipsandtricks.com/cutting-torch.html
  6. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  7. http://www.weldingtipsandtricks.com/cutting-torch.html
  8. https://www.popsci.com/diy/article/2009-10/basic-skills-oxy-acetylene-cutting
  9. https://www.popsci.com/diy/article/2009-10/basic-skills-oxy-acetylene-cutting
More References (14)
  1. http://www.weldingtipsandtricks.com/cutting-torch.html
  2. http://www.weldingtipsandtricks.com/cutting-torch.html
  3. http://www.weldingtipsandtricks.com/cutting-torch.html
  4. http://www.weldingtipsandtricks.com/cutting-torch.html
  5. Ryaan Tuttle. Home Improvement Specialist. Expert Interview
  6. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  7. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  8. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  9. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  10. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  11. http://www.thedrive.com/gear-up/3240/how-to-cut-metal-with-an-acetylene-torch
  12. https://www.boc.com.au/wcsstore/AU_BOC_Industrial_Store/pdf/product/en_AU/Guidelines-for%20Gas-Welding-and-Cutting.pdf
  13. http://www.weldingtipsandtricks.com/cutting-torch.html
  14. https://www.boc.com.au/wcsstore/AU_BOC_Industrial_Store/pdf/product/en_AU/Guidelines-for%20Gas-Welding-and-Cutting.pdf

About This Article

Ryaan Tuttle Co-authored by: Ryaan Tuttle Home Improvement Specialist This article was co-authored by Ryaan Tuttle and by wikiHow staff writer, Amy Bobinger, BA. Ryaan Tuttle is a Home Improvement Specialist and the CEO of Best Handyman, Inc. in Boston, Massachusetts. With over 17 years of experience, he specializes in building home service businesses, focusing on creating scalable and efficient brands. With the help of his global team, the companies have achieved over 10+ million in sales and received recognition through magazine features, and enjoy partnerships with wikiHow and Jobber field service software. Boston Magazine and LocalBest.com have named Best Handyman Boston the Best Handyman in Boston. Ryaan holds Construction Supervisor and Home Improvement Contractor Licenses. This article has been viewed 715,214 times. 21 votes - 95% Co-authors: 28 Updated: September 30, 2025 Views: 715,214 Categories: Cutting Tools Article SummaryX

To use a cutting torch, first put on fire-retardant clothes, gloves, and goggles. Next, light the torch by holding the torch tip against the striker. Once you’ve adjusted the flame size to the right length, move the flame to the steel you want to cut and push 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. Keep reading to learn how to prepare your workspace and properly set up your cutting torch. Did this summary help you?YesNo

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Reader Success Stories

  • David Newman

    David Newman

    Jan 3, 2017

    "I've been around a lot of welders, always having problems when we get to site: forgot striker, end of torch,..." more
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Did this article help you?

Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Ryaan Tuttle Co-authored by: Ryaan Tuttle Home Improvement Specialist Co-authors: 28 Updated: September 30, 2025 Views: 715,214 95% of readers found this article helpful. 21 votes - 95% Click a star to add your vote David Newman

David Newman

Jan 3, 2017

"I've been around a lot of welders, always having problems when we get to site: forgot striker, end of torch,..." more Rajendra Gupta

Rajendra Gupta

Feb 22, 2017

"I didn't know detailed procedure for gas cutting. This article has given me the insight and each and every..." more Troy Helmandollar

Troy Helmandollar

Jun 7, 2016

"I haven't used a torch since the mid 1970s in high school, so I just wanted a quick refresher as I had..." more Ankur Tyagi

Ankur Tyagi

Apr 5, 2016

"I really like the details mentioned here. Very helpful to me." Jimmy Jenkins

Jimmy Jenkins

Nov 17, 2016

"It was very helpful, thank you very much." Share yours! More success stories Hide success stories

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