Welding torches used in gas welding feed the fuel gases, such as acetylene and oxygen, to the weld site. The gases pass through two channels and regulating valves and then enter a mixing chamber, where a combustible mixture is prepared; the mixture then enters the head. Low-pressure torches are equipped with a built-in injector that provides suction of the fuel gases. In high-pressure torches, the fuel gas is fed under pressure from gas generators or from cylinders.
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