Cylinders should only be used and stored in the vertical position. Finally, it will get out to the tip called the cutting tip. wikiHow is where trusted research and expert knowledge come together. I've never welded with an acetelyn torch, only cut. There are 24 references cited in this article, which can be found at the bottom of the page. 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. Open the acetylene valve again, allowing the oxygen remaining in the mixing chamber... 3. Assuming your using a "Dual-Guarded Torch" First, you must open the BOTTOM Oxygen knob all the way. Cutting is the #1 most widely used process of the gas torch outfit. You'll also need to connect the gas supplies, like the oxygen and the acetylene hoses, to the torch. Finally, open the torch acetylene valve ½ turn and use a friction lighter to light the flame. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/17\/Set-Up-an-Oxy-Acetylene-Torch-Step-01.jpg\/v4-460px-Set-Up-an-Oxy-Acetylene-Torch-Step-01.jpg","bigUrl":"\/images\/thumb\/1\/17\/Set-Up-an-Oxy-Acetylene-Torch-Step-01.jpg\/aid488871-v4-728px-Set-Up-an-Oxy-Acetylene-Torch-Step-01.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"