| 摘要 |
PURPOSE: A head of a torch is provided to increase the supply quantity of preheating gas and prevent backfire since preheating gas is mixed in a head and a tip. CONSTITUTION: A head of a torch comprises a preheating oxygen jetting nozzle. The preheating oxygen jetting nozzle is placed inside the head. The preheating gas is absorbed by flow velocity generated when preheating oxygen is sprayed by the preheating oxygen jetting nozzle. The preheating gas and the preheating oxygen are mixed inside the head and a tip(C). The section of a jetting hole(3-10) of a tapered jetting nozzle has is smaller than the section of oxygen supply holes(3-1,3-2) so flux is increased.
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