Safe Operating Pressures for Welding

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Safe Operating Pressures for Welding

Creating, cutting or repairing metal objects can involve welding. One type of welding uses an oxy-acetylene mixture of gases. Instead of air, pure oxygen is used to increase the temperature of the flame. The gases are stored separately in tanks and to monitor the gases, a pressure gage is installed on both the oxygen and the acetylene tanks. Before starting, each tank should read zero psi. To start the flame, the valve of the acetylene tank is rotated about a quarter of a turn to apply pressure to the regulator. Then the acetylene pressure is increased to 7 psi. Next, the oxygen gas valve is fully opened and then its regulator is adjusted to 40 psi. To start the flame, the acetylene valve on the torch is turned about ½ of a turn and an arc striker is used to ignite the acetylene. Then, the oxygen valve on the torch is opened to achieve a neutral flame or one without a hissing sound and where the flame goes from orange to blue. For safety, the acetylene is turned off at the torch and then the oxygen.  Similarly, at the tanks the acetylene is turned off first and then the oxygen. After purging the torch to make sure any gas residue is removed, the regulators are backed out and the final step is to check and make sure both tanks show zero pressure.

Acetylene tank welding torch

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