A cutting nozzle for a gas torch, such as a postmixed oxy-fuel gas torch, comprising a body with a torch end adapted to engage the gas torch, a discharge end, and a peripheral surface between the torch end and the discharge end. The body has a plurality of bores for respectively conducting fuel gas, preheat oxygen and cutting oxygen through the nozzle, each of the plurality of bores extending from the torch end and terminating in a respective discharge orifice at the discharge end of the body. A set of the plurality of bores are preheat oxygen bores connected to an oxygen source at the torch end for discharging the preheat oxygen at the discharge end. A plurality of air bores each have an inlet orifice located on the peripheral surface of the body and open to an air source, and a discharge orifice in or proximal to the discharge end.

Provided herein are flashback arrestors disposed proximate the head of a cutting torch for restricting flashback into the torch head. In one approach, a torch assembly is provided including a torch head having a gas passageway formed within a body of the torch head, and a tip coupled to a distal end of the torch head. In some approaches, the tip has a proximal end and a distal end, the distal end of the tip including an exit orifice and the proximal end of the tip having a set of openings in fluid communication with the gas passageway for delivering a gas towards the exit orifice. The torch assembly further includes a filter coupled to the tip at the proximal end thereof, the filter disposed between the set of openings and the gas passageway for restricting flashback into the torch head.

Provided herein are flashback arrestors disposed proximate the head of a cutting torch for restricting flashback into the torch head. In one approach, a torch assembly is provided including a torch head having a gas passageway formed within a body of the torch head, and a tip coupled to a distal end of the torch head. In some approaches, the tip has a proximal end and a distal end, the distal end of the tip including an exit orifice and the proximal end of the tip having a set of openings in fluid communication with the gas passageway for delivering a gas towards the exit orifice. The torch assembly further includes a filter coupled to the tip at the proximal end thereof, the filter disposed between the set of openings and the gas passageway for restricting flashback into the torch head.

A modular transportable oxy-fuel cutting device, comprising: liquid oxygen containers; vaporizers; and a cutting torch. The liquid oxygen containers, vaporizers, and the cutting torch are all in fluidic communication with each other through a series of pipes. The liquid oxygen containers are configured to contain a liquid oxygen fluid and supply the liquid oxygen fluid to the vaporizers; wherein the vaporizers are configured to convert the liquid oxygen fluid to an oxygen gas; and the cutting torch is adapted to accept the oxygen gas and a fuel gas.

A modular transportable oxy-fuel cutting device, comprising: liquid oxygen containers; vaporizers; and a cutting torch. The liquid oxygen containers, vaporizers, and the cutting torch are all in fluidic communication with each other through a series of pipes. The liquid oxygen containers are configured to contain a liquid oxygen fluid and supply the liquid oxygen fluid to the vaporizers; wherein the vaporizers are configured to convert the liquid oxygen fluid to an oxygen gas; and the cutting torch is adapted to accept the oxygen gas and a fuel gas.

Provided is a backfire preventing gas cutting apparatus for cutting a workpiece by heating the workpiece using a preheating flame and injecting cutting oxygen and comprises: a nozzle bundle which is coupled with a valve bundle wherein the nozzle bundle comprises: a tip having a flame outlets formed at the front end thereof; and a head frame coupled with the tip. An injecting unit is formed on the inside of the head frame for enabling the laminar flow of the fuel gas through the injecting flow path by increasing a flow rate of the preheating oxygen introduced into the injecting flow path.

Provided is a backfire preventing gas cutting apparatus for cutting a workpiece by heating the workpiece using a preheating flame and injecting cutting oxygen and comprises: a nozzle bundle which is coupled with a valve bundle wherein the nozzle bundle comprises: a tip having a flame outlets formed at the front end thereof; and a head frame coupled with the tip. An injecting unit is formed on the inside of the head frame for enabling the laminar flow of the fuel gas through the injecting flow path by increasing a flow rate of the preheating oxygen introduced into the injecting flow path.

A device for igniting oxygen thermal lances or melting lances may include: a cartridge configured to couple to an operating end of a thermal or melting lance, configured to be supplied with oxygen to ignite the lance, and containing high calorific value material; and an induction heater assembly configured to heat the cartridge, such that the high calorific value material is burnt before supplying the oxygen into the cartridge to ignite the lance. The cartridge may include: a first end configured to couple to an operating end of a lance; and a second end having one or more axial holes for passing oxygen into the cartridge. An assembly for igniting oxygen thermal lances or melting lances may include: the device; the lance coupled to an end of the cartridge; a robotic arm configured to handle the lance; and a supply of oxygen in fluid communication with the lance and cartridge.

A device for igniting oxygen thermal lances or melting lances may include: a cartridge configured to couple to an operating end of a thermal or melting lance, configured to be supplied with oxygen to ignite the lance, and containing high calorific value material; and an induction heater assembly configured to heat the cartridge, such that the high calorific value material is burnt before supplying the oxygen into the cartridge to ignite the lance. The cartridge may include: a first end configured to couple to an operating end of a lance; and a second end having one or more axial holes for passing oxygen into the cartridge. An assembly for igniting oxygen thermal lances or melting lances may include: the device; the lance coupled to an end of the cartridge; a robotic arm configured to handle the lance; and a supply of oxygen in fluid communication with the lance and cartridge.

The relevant regulations in the field of automated flame-cutting technology stipulate various safety devices for the process-gas supply of a cutting torch. The invention relates to the simplified installation and maintenance of the safety devices and to a compact structure thereof. Proposed is a multi-functional safety module, in the module body of which there are integrated a first and a second safety element to prevent flame- or gas-blowout, and in which there is provided a mechanical plug-type connection for establishing a gas-tight connection between the safety elements and the corresponding gas lines of the cutting torch.