Welding Basics by Karen Ruth

Author:Karen Ruth
Language: eng
Format: epub, pdf
Publisher: Creative Publishing international
Published: 2011-02-27T05:00:00+00:00

Cutting Torch & Tips. Most oxyacetylene welding sets come with a cutting accessory that attaches to the torch body in the same way that the welding tips do. A dedicated cutting torch is a one-piece unit that has its own mixing chamber. Its greater overall length allows for more distance between the heat zone and the operator, and it can handle higher oxygen flow rates. A dedicated cutting torch is usually fairly expensive and not necessary unless very thick metals will be cut, which requires greater oxygen flow.

Both the cutting torch and the cutting attachment take a variety of cutting tip sizes. The cutting tip has a number of preheat holes surrounding the pure oxygen orifice. It is important to match the cutting tip to the thickness of the metal being cut. A welder often takes a one-size-fits-all approach to cutting tips, which always results in poor-quality cuts. Thinner metals require fewer preheat holes and a smaller oxygen orifice; thicker metals require more preheat holes and a larger oxygen orifice. Cutting tips are made of copper and can be damaged easily. They need to be cleaned regularly with an appropriately sized tip cleaner.

Fuel Gas Options. Because the metal being cut does not need to be brought to the melting point, various gases other than acetylene can be used. Propane, natural gas, propylene, and methylacety-lene-propadiene can be used as the preheating fuel source. Each of these gases requires specific regulators and may require different torches and torch tips. Check manufacturer’s recommended usage before substituting an alternate fuel gas.

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