How to adjust the flame of gas welding? Why do you want to adjust? Why does gas welding emphasize the sequence of gas switch?

When igniting, first slightly open the oxygen valve, then open the acetylene valve, and ignite the flame with an open flame (e.g. electron gun or low-voltage electric spark can be used. ). At this time, the flame is carbonized flame, and then gradually open the oxygen valve to adjust the carbonized flame to neutral flame. If oxygen (or acetylene) increases continuously, an oxidation flame can be obtained.

During ignition, the sound of "shooting" may appear continuously. Because acetylene is impure, it is necessary to release impure acetylene and re-ignite; Sometimes it is difficult to ignite because of too much oxygen, so it is necessary to close the oxygen valve slightly. When igniting, don't aim the hand holding the fire source directly at the welding nozzle, and don't point at others to avoid burns.

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