DIY Network

Metalworking II: Using a Propane Torch From "DIY Tools & Techniques" episode DIT-248

David Thiel demonstrates the correct technique for using a propane torch.

The propane cylinder holds the gas. The igniter lights the torch and controls the flow of gas. A propane torch can also be used to burn grass that comes up through the cracks in your driveway. Another application is to heat up stuck, rusted bolts. The heat expands the metal so you can loosen the bolts.

Here, Thiel features the soldering of copper pipe.

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	Figure A
	Figure B

Soldering Copper Pipe

1. Copper pipe needs to be cleaned before it can be soldered. First, use sandpaper to clean the inside and outside of the pipes and fittings that will be joined.

2. Next, use flux to remove impurities from the inner and outer surfaces of both pipes. Spread the flux over the entire surface with a brush. (figure A). Then, slide the two pieces together.

3. While wearing safety glasses, fire up the propane torch. All three parts of the flame should be blue; if the flame is orange, turn gas down.

4. Hold the flame on the tip of pipe to heat. The flux will turn to liquid and the pipe will change color slightly. When the pipe is heated, touch the soldering wire to the joint. If done correctly, the solder will be drawn into the joint. (figure B).

5. Once the joint is soldered, use a wet cloth to clean up the area.