How Does a Welding Torch Work?
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Melting the Metal
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The flame that is created by the tip of the welding torch melts the metal together that is to be welded. Most ferrous metals--metals that contain iron--will readily melt under the temperature provided by the oxygen/acetylene flame. When the torch is first placed onto the two metal pieces, it must be left there until a small puddle of molten metal appears. This puddle is then worked along the joint, welding the two pieces together.
Filling the Gap
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At the metal joint, a gap will be present if no filler material is added to the weld. The welding rod or filler rod must be used to create a strong weld. The material for the filler rod can be a sophisticated combination of metal or as simple as a wire coat hanger. The filler rod can be any combination of material as long as it is similar to the two materials being welded.
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Combination Metals
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A welding torch has the advantage over other welding methods in that it can also weld dissimilar materials together under the correct conditions. Brass can be welded to mild steel. Brass can also be used for a filler material to repair large cast iron engine blocks or gears for industry. The welding torch is very portable as no electricity is used in the operation. Although practice is required, torch welding can be an enjoyable art and profession as the welder readily observes the process and control of the weld. The first torch welding was derived from blacksmiths and their heating of two metals in a coal fire. The extension of this practice is that of torch welding with oxygen and acetylene gas.
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