Can you weld with a blowtorch?

There are many forms of welding: underwater welding, welding with machines that do not require gas, and welding with machines that require gas. Similarly, one way to weld is to use a welding torch. Of course, a torch requires gas to operate and weld. But it is possible to weld with a torch.

You can weld with a torch that works with combustible gases, propane, oxygen, and hydrogen. You can also use a butane torch to weld metal. The two prerequisites for welding metals and joints are heat and thermal energy. Since a torch provides heat and thermal energy, it can be used for welding.

Unlike normal forms of welding, torch welding requires skill. It is a work of precision and skill so that the metal welded does not break. Therefore, most welders, especially those new to the welding industry, need to take lessons and courses to learn how to use a torch.

It is necessary to control the gas flow when using a torch for welding. Therefore, reaching the desired temperature and then maintaining it is very important. This guide will be a pleasant read if you think of making the switch to torch welding. Expect to learn all about using a welding gun: the technique, the procedure, the risks, benefits, challenges, and more.

The Correct Technique To Use a Blowtorch: What Gases Can be Used?

Using a torch to weld metal can be quite tricky. However, there is a correct technique that you must follow step by step to perform torch welding safely.

Before I can explain the technique with which you should use a torch, I would like to mention the gases that can be used for welding.

These are the direct (and combustible) gases you can use for torch welding:

  • A mixture of fuel gas and oxygen.
  • Propane
  • Hydrogen
  • Butane
  • Acetylene

With that said, it’s about time I walked you through the correct technique for using a welding torch.

Gas mixture adjustment

Whether using pure gas or fuel gases for welding with a torch, you must first focus on fine-tuning the amount of oxygen and fuel gas. This particular step should be done as soon as the oxygen cylinder valve is opened. Then, keep adjusting the flame until its color turns blue.

Start Using the Blowtorch in a Circular Motion

As soon as the flame turns blue, ensure the metal pieces to be welded are well supported. Start using the torch so that the flame covers the entire surface of the joint in a circular motion. Look very closely. If you find that a pool of molten metal has already formed, it’s time to push the collected metal down and weld it directly with the torch.

The presence of any cracks or crevices should be filled with more metal using a torch in the same way as described above: first moving the torch in a circular motion and then welding the collected metal together in a straight line. Again, it is important to have a welding rod handy and nearby when using a welding gun. The welding rod will need to fill the space between the two metals. Any delay will cause the joint to become brittle during cooling.

Dangers of Using a Blowtorch for Welding

A blowtorch can reach very high temperatures. The very fact that you use combustible gases like oxygen is the biggest danger of using a blowtorch. You have to be careful when using one. In addition to using fuel gases, there are other significant hazards when using a welding torch.

  1. The flame emitted by a welding torch is extremely bright. Colored welding goggles that fall off can damage your eyesight and weaken it.
  2. If the gas pressure drops suddenly (or stops completely), there is a high probability of backfire. It is not usually life-threatening, but the loud crackling sound of the backfire can cause short-lived tinnitus.
  3. A flashback, on the other hand, is extremely dangerous. While a backfire won’t hurt you, a flashback will. For example, occurs if there is a lock. Since fuel gases are extremely combustible, even a backfire can cause a fire.

Benefits of Using a Blowtorch for Welding

It is better if you were a professional to use a welding torch. The benefits of using a welding torch are significant when you are trained to handle pressure and regulate gases, so there is no danger of backfiring or flashback.

  1. A torch is a portable device. It offers ease of use. Also, it can be used to melt many metals. Therefore, it finds applications and uses in many industries.
  2. A torch can be used to preheat the castings so they can be easily welded and repaired.
  3. A torch first creates a weld pool by melting the metals to be welded. The molten metals mix very well, filling all the voids very smoothly. The resulting bond is very strong.


Welding with a torch comes with several challenges. However, torch-welded joints are very strong and clean. It is one of the main reasons why torch welding is so popular.

A welder must take courses, and certifications are sometimes required to affirm that the welder is professionally trained to control the flow of gases, so there is no danger of starting a fire.

Keep in mind that torch welding has many benefits, and the different fuel gases used to start a flame can melt most metals. So, with the right amount of training, you can use a torch to weld metals by melting them first.

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