How To Set Up An Oxy Acetylene 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 Set Up an Oxy Acetylene Torch PDF download Download Article Co-authored by Surekha Krishnan

Last Updated: November 25, 2025 Fact Checked

PDF download Download Article
  • Attaching Pressure-Reducing Regulators
    • |
  • Connecting Gas Supplies to the Torch
    • |
  • Testing Connections for Leaks
    • |
  • Obtaining the Correct Operating Pressure
    • |
  • Lighting the Flame
    • |
  • Video
    • |
  • Expert Interview
    • |
  • Expert Q&A
    • |
  • Tips
    • |
  • Warnings
|Show more |Show less X

This article was co-authored by Surekha Krishnan. Surekha Krishnan is a Metallurgy Expert based in Columbia, South Carolina. Surekha specializes in both arc welding and solid-state welding and has been a Plant Metallurgist at FN America, LLC since 2021. Surekha has over 7 years of experience, is an expert in all heat treat processes and record retention, has prior experience as a Weld Engineer, and has taught various IIW welding courses in the past. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 944,298 times.

An oxy acetylene torch is an affordable and versatile tool used by many people to heat, weld, solder, and cut metal. It uses extreme heat to function, and setting it up properly is one of the most important steps in using it safely. Using pressure-reducing regulators, connecting gas supplies, and safely lighting the torch flame are all essential parts of learning how to use an oxy acetylene torch.

Steps

Part 1 Part 1 of 5:

Attaching Pressure-Reducing Regulators

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  1. Step 1 Fasten oxygen and acetylene cylinders in an upright position. 1 Fasten oxygen and acetylene cylinders in an upright position. If you have a cylinder cart, place both the oxygen and acetylene cylinders into it. If not, they should be securely fastened with a chain to a workbench, a wall, or a post. Cylinders should not be able to be knocked or pulled over.[1]
    • Cylinders should only be used and stored in the vertical position.
  2. Step 2 Clean the valve outlet of accumulated dust or dirt. 2 Clean the valve outlet of accumulated dust or dirt. Stand so the outlet is facing away from your body and open the valve a 1/4 turn, very quickly, and then close it. This will clear out any dust or dirt that may have settled in the valve. It needs to be cleaned out otherwise the debris might get into other parts of the torch and cause it to malfunction.[2]
    • Warning: never clear a fuel gas cylinder near other welding work that is in progress or near sparks or flames.
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  3. Step 3 Connect the oxygen and acetylene regulators to their cylinders. 3 Connect the oxygen and acetylene regulators to their cylinders. The regulators let you see how much pressure you’re using while working and are essential to safely starting and operating an oxy acetylene torch.[3]
    • If the regulator and cylinder have different threads (meaning they don’t fit into each other), you will need to use an adaptor, which can be purchased at any local hardware store.
  4. Step 4 Tighten the nuts of the regulator connections with a wrench. 4 Tighten the nuts of the regulator connections with a wrench. Don’t assume because you have turned the nut as far as you can with your hand that it is tight enough. Use a wrench with a fixed opening (rather than an adjustable wrench) that is designed specifically for welding tools. You can buy these from a hardware store or a specific apparatus supplier.[4]
    • If you ever need to make an adjustment after the cylinder has been opened and used, make sure to close the cylinder valve before tightening the nut again. Also, always make sure nothing in your environment has changed before relighting the torch.
  5. Step 5 Rotate the pressure-adjusting screw to the left until it turns freely. 5 Rotate the pressure-adjusting screw to the left until it turns freely. Do this for each regulator. The valve in the regulator needs to be closed before cylinder pressure is admitted. Turning the pressure-adjusting screw counter-clockwise removes the pressure from the spring in the regulator.
    • When the screw turns freely, you should be able to just tap it with your finger and see it move, rather than having to apply pressure.
  6. Step 6 Open the oxygen and the acetylene valves very slowly. 6 Open the oxygen and the acetylene valves very slowly. Make sure you can see the cylinder-pressure gauges, but don’t stand directly in front of the valves. Open the valves slowly to protect yourself and your machine from any potential combustion.
    • Open the oxygen valve very slightly at first and pause until the pressure gauge hand isn’t moving any more before moving on to open the valve fully.
    • The acetylene valve should never be opened more than 1 and 1/2 turns.[5]
  7. Step 7 Leave the wrench on the acetylene valve while it is open. 7 Leave the wrench on the acetylene valve while it is open. Basically, if you have an emergency you won’t have to waste time looking for an appropriate wrench. If it’s on there, you’ll be able to close the cylinder valve right away.
    • In general, it’s smart to work in an area where you can reach all your tools without having to search for them. Think ahead when you are starting a project and bring your tools to your workspace before beginning.
    Review safety steps before using a torch. "I hadn't done any welding with my oxy-acetylene torch in years. When I needed to use it for a project, I realized I'd forgotten all the right safety steps. This article was a lifesaver, walking through attaching the regulators, testing for leaks, and lighting the flame properly — all stuff I used to know but blanked on after so long. Now, I can weld confidently again without worries, thanks to the refresher." - Paul C. Learn new welding techniques. "I've only ever used my torch for cutting metal before. But I've got some DIY welding jobs piling up and wanted to save money instead of hiring someone. This article explained adjusting the pressures and flame for welding so clearly. I never realized how different it is from cutting. The instructions gave me the confidence to weld simple pipes on my own for the first time." - Chris B. Revisit basics for safety. "Even as an experienced welder, it's easy to get casual with safety after years in the job. This was a great refresher on steps I'd gotten rusty on, like properly attaching hoses, checking for leaks, and lighting the flame right. Going back to the fundamentals ensures I don't get sloppy — it keeps me and others safe." - Kevin A. Get back up to speed after a hiatus. "After ten years away from gas welding, I was really nervous to use a torch again for a volunteer project. But this article quickly got me back in the groove. Reviewing gauge pressures, leak checks, and lighting techniques made me feel prepared instead of anxious. It was just the thorough refresher I needed after such a long break!" - Richard E. We want to hear from you! Advice from our readers makes our articles better. If you have a story you’d like to share, tell us here.
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Part 2 Part 2 of 5:

Connecting Gas Supplies to the Torch

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  1. Step 1 Use a hose and hose connections specific to welding and cutting. 1 Use a hose and hose connections specific to welding and cutting. Oxygen hoses will have a green cover, while acetylene hoses will have a red cover. Never interchange these hoses as they are meant for different substances. If one of your hoses have broken, replace it—don’t use tape of any sort to try and patch the hole.
    • A hose with a natural rubber liner is okay for acetylene service.
  2. Step 2 Do not use any oil or grease on the hoses. 2 Do not use any oil or grease on the hoses. All the connections from the gas supplies to the torch are metal-to-metal, and they don’t require lubricants or sealants. Similarly, don’t use any pipe-fitting tools to connect the hoses to the torch.
    • Don’t force connections—if the threads don’t run together easily by hand, either the threads are damaged or the parts aren’t meant to go together.
  3. Step 3 Attach the oxygen hose to the oxygen regulator and to the torch. 3 Attach the oxygen hose to the oxygen regulator and to the torch. The torch should have identifying marks on the body or the handle showing where the hose should be connected. Most torches have 2 oxygen connections because 1 is used for the cutting jet and 1 is used for the preheat flames. If there isn’t an adaptor on the torch that unites these 2 connections, you will need to use 2 oxygen hoses, 2 regulators, and 2 oxygen tanks.
    • Most new oxy acetylene torches come with built in adapters, but double-check with the manufacturer’s instructions to be safe.
  4. Step 4 Connect the acetylene hose to the acetylene regulator and to the torch. 4 Connect the acetylene hose to the acetylene regulator and to the torch. Sometimes the torch doesn’t specify which connection is for the acetylene, though the oxygen will be clearly marked. Whichever connection is not for the oxygen is for the acetylene.
    • Double check your connections before moving on to make sure everything is hooked up to the right place.
  5. Step 5 Tighten the hose connections with a wrench. 5 Tighten the hose connections with a wrench. Don’t trust your hand strength to tighten these connections for you. Use a non-adjustable wrench to securely fasten both the oxygen and acetylene hoses to the torch.
    • Having tight connections is extremely important because they will keep both the oxygen and acetylene from leaking.
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Part 3 Part 3 of 5:

Testing Connections for Leaks

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  1. Step 1 Close both torch valves. 1 Close both torch valves. For the oxygen, turn the pressure-adjusting screw on the regulator until the gauge reads about 25 psi. For the acetylene, turn the pressure-adjusting screw on the regulator until the gauge reads about 10 psi.
    • It is very important to test for leaks before starting your project. Leaks can cause harm to you or your surroundings and may lead to spontaneous combustion of the cylinders.
  2. Step 2 Apply a leak-test solution with a brush. 2 Apply a leak-test solution with a brush. Apply the solution to the cylinder valves, the cylinder and regulator connections, and all the hose connections. You can either buy a solution from the store for this specific purpose, or you can dissolve Ivory soap in water to make a thin paste for the same results.
    • Any work brush you have on hand will do; just make sure it hasn’t been compromised by oil or gas.
  3. Step 3 Check the leak-test solution for bubbles. 3 Check the leak-test solution for bubbles. Bubbles indicate that either oxygen or acetylene is coming through the connectors and the connection needs to be tightened or reattached completely. The bubbles won’t be big, like in a pot of boiling water; rather, they will be small and will make the surface of the testing solution look uneven.
    • Give the solution 1-2 minutes to sit before checking for leaks.
  4. Step 4 Release all pressure from any system that has a leak. 4 Release all pressure from any system that has a leak. Reattach or retighten as needed, and apply the leak-test solution a 2nd time to test the torch for leaks again. After completing the testing, make sure to turn off both the oxygen and acetylene.
    • If after you’ve tested and refastened any leaking areas you are still seeing bubbles, that may indicate you have a leaky hose and need to get a new one before moving on with your project.
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Part 4 Part 4 of 5:

Obtaining the Correct Operating Pressure

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  1. Step 1 Turn the oxygen regulator pressure-adjusting screw. 1 Turn the oxygen regulator pressure-adjusting screw. Slowly do this until you reach the desired pressure. The pressure will be indicated on the delivery-pressure gauge. Then you will close the torch oxygen valve. If you are using a cutting torch, open only the torch cutting oxygen valve. If you are using a cutting attachment, open the oxygen valve on the torch handle and the cutting oxygen valve on the attachment.
    • Don’t set the pressure higher than what the equipment manufacturer recommends.
  2. Step 2 Adjust the acetylene adjuster screw to the desired working pressure. 2 Adjust the acetylene adjuster screw to the desired working pressure.[6] Do not exceed 15 psi. Close the acetylene valve immediately after you obtain the right pressure. You shouldn’t open the valve more than 1 full turn.
    • If you open the valve too fast or too far, you may cause the canister to combust.
  3. Step 3 Do not release acetylene or other gasses near sources of ignition. 3 Do not release acetylene or other gasses near sources of ignition. Also, make sure you are working in a well-ventilated area. It is advisable to keep a fire extinguisher in your workspace in case there are any explosions or emergencies.
    • Heating, welding, and cutting cause smoke and fumes that are bad to breathe in and that can irritate the skin.
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Part 5 Part 5 of 5:

Lighting the Flame

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  1. Step 1 Check the manufacturer’s instructions for the torch before beginning. 1 Check the manufacturer’s instructions for the torch before beginning. Though most torches follow the same operating procedure, the manufacturer’s instructions may have helpful tips or warnings that are specific to your torch. Read it thoroughly before following steps or tips from any other sources.[7]
    • You can also search the manufacturer online to check out more information regarding your tool. A lot of sites have community forums where people post tips and stories about their experiences that you can learn from.
  2. Step 2 Open the torch acetylene valve 1/2 turn and light the flame. 2 Open the torch acetylene valve 1/2 turn and light the flame. Use a friction lighter rather than a match for this step. A friction lighter is also called a torch striker, and these can be found at hardware stores. You will see a flame coming out of your torch. If for some reason there isn’t a flame, turn off the acetylene valve and check your connections.
    • Remember to not have the oxygen gas flowing when you go to light the torch.
  3. Step 3 Reduce the acetylene flow by adjusting the torch acetylene valve. 3 Reduce the acetylene flow by adjusting the torch acetylene valve. The flame should start to produce black smoke around the edges. Once the black smoke appears, start to increase the acetylene flow back up again just enough to get rid of the black smoke. The flame should still be attached to the tip (it shouldn’t appear as though it has “jumped away” from it).
    • The lighting procedure should result in a neutral flame, which is blue in color and which does not make a hissing sound.[8]
  4. Step 4 Stop working if the flame suddenly goes out. 4 Stop working if the flame suddenly goes out. This is called “backfire” and can happen it the torch comes into direct contact with the metal. If this happens, go ahead and relight the torch again right away. If backfire occurs repeatedly without contact with the work, it may be due to incorrect operating pressures or a loose nozzle in the torch. In this case, check the operating pressures and take a look at the torch to make sure everything is connected properly.
    • If in doubt, turn off the gasses and check your machine over before proceeding.
  5. Step 5 Turn off the torch if there is flashback. 5 Turn off the torch if there is flashback. Flashback is when there is a pronounced hissing or squealing noise. This means there is something wrong with the torch or with the set up. After turning off the torch and investigating the cause, wait until the torch has cooled before attempting to light it again.[9]
    • If your torch keeps experiencing flashback, there may be a damaged piece that needs to be returned or replaced.
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Expert Q&A

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  • Question What are the types of flames that an Oxy Acetylene Torch produces? Surekha Krishnan Surekha Krishnan Metallurgy Expert Surekha Krishnan is a Metallurgy Expert based in Columbia, South Carolina. Surekha specializes in both arc welding and solid-state welding and has been a Plant Metallurgist at FN America, LLC since 2021. Surekha has over 7 years of experience, is an expert in all heat treat processes and record retention, has prior experience as a Weld Engineer, and has taught various IIW welding courses in the past. Surekha Krishnan Surekha Krishnan Metallurgy Expert Expert Answer So, an oxy-acetylene torch produces three types of flames: oxidizing, reducing, and neutral. The oxidizing flame contains a higher proportion of oxygen, which results in a hotter flame that is used for cutting metals or welding materials like brass, where excess oxygen helps to form a protective oxide layer. Next is the reducing flame, which has more acetylene than oxygen. This type of flame is cooler and has a reducing environment, making it ideal for welding metals like aluminum and high-carbon steels where oxidation needs to be minimized. Lastly, the neutral flame is a balanced mixture of oxygen and acetylene, which provides a stable and clean flame that is perfect for general welding tasks. Also, keep in mind that the torch must be set up correctly by adjusting the oxygen and acetylene cylinders to the desired mixture that is tailored to the specific welding or cutting requirements. 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 1 Helpful 2
  • Question Why is the head of an oxy acetylene torch made of brass? Community Answer Community Answer Because it is a corrosion resistant metal that will not create sparks when struck against other substances. 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 5 Helpful 30
  • Question Which tip should I use to heat the metal up? Community Answer Community Answer There is a tip called a rose bud that produces a large area to heat metals. A brazing tip can work on smaller areas. 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 7 Helpful 36
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Tips

  • If you have long hair, tie it back or tuck it into a bandanna or cap. Thanks Helpful 4 Not Helpful 0
  • Keep animals and children away from your work area when operating an oxy acetylene torch. Thanks Helpful 5 Not Helpful 1
  • Keep the torch tip clean. Thanks Helpful 4 Not Helpful 1
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

  • Never attempt to repair hoses with tape of any sort. Thanks Helpful 3 Not Helpful 2
  • Never use torches, regulators, or hoses in need of repair. Thanks Helpful 2 Not Helpful 1
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Expert Interview

Thanks for reading our article! If you’d like to learn more about welding, check out our in-depth interview with Surekha Krishnan.

References

  1. ↑ https://itstillruns.com/set-up-oxyacetylene-torch-4909709.html
  2. ↑ https://itstillruns.com/set-up-oxyacetylene-torch-4909709.html
  3. ↑ https://itstillruns.com/set-up-oxyacetylene-torch-4909709.html
  4. ↑ https://itstillruns.com/set-up-oxyacetylene-torch-4909709.html
  5. ↑ https://youtu.be/EQjd3qBpWVE?t=55
  6. ↑ Surekha Krishnan. Metallurgy Expert. Expert Interview
  7. ↑ https://www.uti.edu/blog/welding/oxy-acetylene-welding
  8. ↑ https://youtu.be/EQjd3qBpWVE?t=159
  9. ↑ https://www.uti.edu/blog/welding/oxy-acetylene-welding

About This Article

Surekha Krishnan Co-authored by: Surekha Krishnan Metallurgy Expert This article was co-authored by Surekha Krishnan. Surekha Krishnan is a Metallurgy Expert based in Columbia, South Carolina. Surekha specializes in both arc welding and solid-state welding and has been a Plant Metallurgist at FN America, LLC since 2021. Surekha has over 7 years of experience, is an expert in all heat treat processes and record retention, has prior experience as a Weld Engineer, and has taught various IIW welding courses in the past. This article has been viewed 944,298 times. 6 votes - 87% Co-authors: 27 Updated: November 25, 2025 Views: 944,298 Categories: Welding | Tools Article SummaryX

To set up an oxy acetylene torch, start by cleaning any dust or dirt from the valve outlet. Next, attach the pressure-reducing regulators that allow you to safely start and operate the torch. You'll also need to connect the gas supplies, like the oxygen and the acetylene hoses, to the torch. Once everything is assembled, test the connections for leaks. If there aren't any leaks, then set the correct operating pressure. Finally, open the torch acetylene valve ½ turn and use a friction lighter to light the flame. To learn how to get a neutral, blue flame, keep reading! Did this summary help you?YesNo

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Reader Success Stories

  • Paul C.

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    Sep 7, 2016

    "I hadn't done any welding with my oxy-acetylene torch in years. When I needed to use it for a project, I..." 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. Surekha Krishnan Co-authored by: Surekha Krishnan Metallurgy Expert Co-authors: 27 Updated: November 25, 2025 Views: 944,298 87% of readers found this article helpful. 6 votes - 87% Click a star to add your vote Paul C.

Paul C.

Sep 7, 2016

"I hadn't done any welding with my oxy-acetylene torch in years. When I needed to use it for a project, I..." more Chris B.

Chris B.

Sep 15, 2016

"I've only ever used my torch for cutting metal before. But I've got some DIY welding jobs piling up and..." more Richard E.

Richard E.

Aug 20, 2018

"After ten years away from gas welding, I was really nervous to use a torch again for a volunteer project. But this..." more Kevin A.

Kevin A.

Jul 17, 2018

"Even as an experienced welder, it's easy to get casual with safety after years in the job. This was a great..." more S. Yang

S. Yang

Nov 5, 2016

"The steps on how to light up the oxy acetylene torch and how to make adjustments helped. Also, the precautions to..." more Share yours! More success stories Hide success stories

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