Cutting nozzle assembly for a postmixed oxy- fuel gas torch
AssigneeOxy-Arc Repairs & Services Ltd.
InventorClaude Bissonnette
Life of this patent
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Abstract
A novel cutting nozzle assembly for a postmixed oxygen-fuel gas torch is disclosed. The nozzle assembly includes a cylindrical shroud which surrounds and extends away from the gas discharge orifices in the gas discharge end of the cutting nozzle. The cylindrical shroud has the advantage of producing a tighter gas stream and of promoting a more thorough mixing of the preheat oxygen and the fuel gas to provide a hotter, more compact flame which produces a more parallel-sided cut through metal workpieces. The cutting tip therefore conserves metal as well as cutting gases. It also cuts faster than prior art postmixed cutting nozzles.
Claims15
A method of cutting metal using a postmixed oxy-fuel gas torch having a nozzle including a discharge end connected by gas passages to an intake end adapted to be in fluid communication with the postmixed oxy-fuel gas torch, and a shroud which surrounds and extends in an axial direction away from the discharge end of the nozzle to an open end, comprising the steps of conducting cutting oxygen gas, preheat oxygen gas and fuel gas from the torch through the gas passages to the discharge end of the nozzle for initial mixing within said shroud, shaping the flow of gases with the shroud so that the resulting flame effects a more narrow and parallel walled cut of metal to conserve metal at the cut and increase the efficiency of cutting.
A method of promoting a downstream mixing of the gases discharged from a postmixed oxy-fuel gas torch nozzle comprising the step of:
- discharging the gases through a postmixed nozzle having a shroud that surrounds and extends away from a discharge end of the nozzle.
A method of maintaining a tighter cylindrical shape along a greater flow distance of cases discharged from a postmixed cutting nozzle of a postmixed oxy-fuel gas torch, comprising the step of:
- discharging the gases through a postmixed nozzle having a shroud that surrounds and extends away from a discharge end of the nozzle.
A method of cutting metal using a postmixed oxy-fuel gas torch comprising the steps of:
- attaching a nozzle to the torch, the nozzle including a discharge end connected by gas passages to an intake end adapted to be in fluid communication with the postmixed oxy-fuel gas torch, and a shroud which surrounds and extends in an axial direction away from the discharge end of the nozzle to an open end;
- conducting cutting oxygen gas, preheat oxygen gas and fuel gas from the torch through the gas passages to the discharge end of the nozzle;
- and operating the postmixed oxy-fuel torch to cut the metal.
A method of cutting metal with a postmixed oxy-fuel gas torch having a nozzle and for protecting the nozzle against metal splashback occurring during metal cutting, said nozzle including a discharge end connected by gas passages to an intake end adapted to be in fluid communication with the postmixed oxy-fuel gas torch, and a shroud which surrounds and extends in an axial direction away from the discharge end of the nozzle to an open end, comprising the steps of conducting cutting oxygen gas, preheat oxygen gas and fuel gas from the torch through the gas passages to the discharge end of the nozzle for initial mixing within said shroud, and protecting the discharge end of the nozzle with the shroud from molten metal splashback during metal cutting.
A method of effecting a more narrow and parallel walled cut of metal to conserve metal at the cut and increase the efficiency of cutting using a postmixed cutting tip mounted to a postmixed oxy-fuel gas torch nozzle comprising the step of:
- discharging the gases through a postmixed nozzle having a shroud that surrounds and extends away from a discharge end of the nozzle.
Dependencies are inferred from the claim text.