How to Torch Weld

Last Updated: February 20, 2022

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

1
Put on protective clothing, including long pants and shirt, welder's gloves and eye protection.^{[1]
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2
Work in an open space free of any flammable materials.^{[2]
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3
Turn on the fuel adjustment knob. 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.
4
Light the torch. Tilt the lighter so that the fuel is trapped in the spark cup and slowly light the torch.^{[3]
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5
Adjust the flame size. 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

1
Clean the material to be welded. 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.
2
Apply the flame to your weld. 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]
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- 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.

Community Q&A

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.
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.
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.

Warnings

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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Only use a spark lighter to light your torch, never a butane lighter.

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