How to Torch Weld

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Learning the basics of torch welding is the first step in becoming proficient with many types of welding. However, mastering welding is something that can take time, not necessarily due to its difficulty, but because there are many subtleties involved with maneuvering the torch. There are many types of materials that can be welded, and each has its own unique properties. Once you've mastered the oxygen flow and tip size on a torch, you will be ready to practice handling the torch and apply the process to a variety of projects. Use these tips to learn how to torch weld.

Method 1
Method 1 of 2:

Light the Torch

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    [1]
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    [2]
    • Before igniting the torch, inspect the propane cylinder, hose, and connections for any leaks. Apply a leak gas solution detector. If a leak is detected, shut off the gas supply and fix the issue before proceeding.
    • Perform the lighting process in a well-ventilated area to prevent the accumulation of propane gas.
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    The knob is located on the shorter of the 2 tanks on the torch. Turn the knob slowly, about 1/2 inch (1.3 cm), to release the gas.
    • Slowly open the valve on the propane cylinder to allow gas to flow through. Use a striker or a spark igniter to ignite the propane gas.
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    Tilt the lighter so that the fuel is trapped in the spark cup and slowly light the torch. [3]
    • Hold the striker near the torch nozzle or ignite the spark igniter according to the manufacturer's instructions. The flame should ignite and appear steady.
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    Carefully open the oxygen valve a little bit at a time until you have the size flame you require. A steady flame will have well defined blue edges. [4]
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Method 2
Method 2 of 2:

Use the Torch

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    Check the material you are welding for rust or any other debris. Clean the material until it is smooth and free of dirt or debris.
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    Adjust your flame, and begin to carefully move the torch over the area to be welded. Move at an even pace in order to see your results. If you hold the flame too closely to the material for too long a period, you will create holes in the material. Not enough application will result in the piece not melting. [5]
    • Move your torch in short runs so that you are certain you are getting the result you need. Pay attention to the angle of the torch and the amount of flame, and adjust accordingly.
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  • Question
    When using a torch to weld, what kind of rods are used to connect two pieces of metal?
    Community Answer
    For welding, you use the same metal as the filler that you are welding. For example, mild steel rod to weld mild steel. Using dissimilar metals is brazing or soldering.
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  • Question
    Can I use a common propane torch to weld mild steel and metals such as an exhaust pipe?
    Community Answer
    It should be OK depending on the thickness of the metal; in most cases, yes.
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  • Question
    When welding stainless steel, can I use a different material?
    Community Answer
    Yes, but the effect and strength is undesirable; the steel would not heat up at the same temperatures, causing insufficient fusion of the metals.
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      Tips

      • When adjusting your flame, pay close attention to the inner blue flame as that is where the heat will be concentrated. A nice crisp point should be evident without you hearing a loud hissing sound. If the hiss is heard, the torch is turned up too high and may push your weld all over the material.
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      • If your flame is not getting any blue tint to it, but remains yellow, you don't have enough oxygen open. Adjust the oxygen knob accordingly. Fuel rich flame will be obvious because not only will it be yellow and too cool, It will be very sooty.
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      • Practice welding on pieces of scrap metal that are close to the same size as the material you will eventually weld. Practice also on different sized pieces in order to get the idea of how to move the torch and at what angles you can hold it.
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      Warnings

      • Only use a spark lighter to light your torch, never a butane lighter.
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      • In addition to the flame from a torch, sparks will be thrown throughout the welding process, creating a fire hazard. Work in an open area and keep a fire extinguisher accessible at all times. If you are working outdoors, wet down nearby grass or brush.
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      Things You'll Need

      • Oxyacetylene torch
      • Striker (spark lighter)
      • Protective clothing
      • Protective eyewear


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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 Jones Welding & Industrial Supply Company .

      References

      1. ↑ https://www.hse.gov.uk/welding/welding-controls.htm
      2. ↑ https://www.hse.gov.uk/welding/welding-controls.htm
      3. ↑ https://www.youtube.com/watch?v=OReUnBkmdYo
      4. ↑ https://www.youtube.com/watch?v=OReUnBkmdYo
      5. ↑ https://www.youtube.com/watch?v=NAA2wFZYGYo

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