Figure 15-28.—Mixing head for injector-type welding torch.Figure 15-29.—Equal pressure welding torch.handle are made of seamless hard brass, copper-nickelto draw in the required amount of acetylene. This isalloy, stainless steel, or other noncorrosive metals ofaccomplished by the design of the mixer in the torch,adequate strength.which operates on the injector principle. The weldingThere are two types of welding torches–thetips may or may not have separate injectors designedlow-pressure or injector type and the equal-pressureintegrally with each tip.type. In the low-pressure or injector type (fig. 15-28),The equal pressure torch (fig. 15-29) is designed tothe acetylene pressure is less than 1 psi. A jet ofoperate with equal pressures forhigh-pressure oxygen is used to produce a suction effectacetylene. The pressure ranges from15-21the oxygen and1 to 15 psi. This
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