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How to Set Up an Oxy Acetylene Torch Edited by Rane, Teresa, Wolfdominic, Mark Davis and 12 others An Oxygen Acetylene torch is a tool used to bond two pieces of metal together by means of extreme heat. In addition, Oxygen Acetylene torches can be fitted with a "Cutting Head" and used to cut one solid piece of metal into two or more pieces. 1 Clean the nozzle on the head. This should be done with a fine, round metal file. Just make sure that this nozzle hole is unobstructed. If holes are obstructed, a torch tip bore cleaning tool may be necessary. Ad 2 Securely fasten the "head" of the torch on the end of the hoses. It should thread into a socket where both the Oxygen and Acetylene hoses come together. Usually this joint is brass. 3 Tighten both valves on the "head" that you just secured in the socket. Make sure these valves are shut completely; otherwise, your gas/air mixtures will be off. 4 Turn on