Welding Cutting Pressures. The ame temperature Propylene is used in production welding and cutting. Welding tips usually produce positive pressure higher than 1 pound per square inch PSI and are used at equal pressures of acetylene and oxygen.
The equal pressure type is the most common and is used with fuel gas pressures that are above 1 psi. Oxygen and fuel gas regulators usually have two stages. It is high about 2000 C for hydrogen gas in air at atmo- cuts similarly to propane.
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When propylene is used the spheric pressure and up to 2800 C when pre-mixed torch rarely needs tip cleaning. If more than 100 ft 31 m of hose is required use 12 in. Shade 5 Fusion welding of steel cast iron nickel and copper. The tip of a welding or cutting torch is where the action is see Figure 1.