| 摘要 |
A torch that can employ any of the gaseous welding fuels, even at low pressure, without sustained burning on flashback, characterized by the usual tip, head, body, barrel, oxygen and fuel flow control valves, cutting oxygen valve, cutting oxygen tube assembly and pre-heat tube interconnecting the body and the head and having the improvement of having the pre-heat tube include a diffuser, an outer tube section for conveying the fuel, an inner tube section for conveying the oxygen, a mixer having a mixer orifice that causes the oxygen to be passed therefrom in a high speed jet for aspirating a low pressure fuel into admixture therewith, and a spiral disposed immediately upstream and adjacent the mixer. The mixer has a frusto-conical nose section and operates in conjunction with the spiral to break up any combustion wave that occurs on flashback and dissipate the heat associated therewith, so there is no sustained burning even if a flashback does infrequently occur.
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