A water torch with tip for providing separate streams of hydrogen and oxygen at its exit includes the tip. The tip has a tip inlet end and a tip outlet end. The tip includes an inner housing and an outer housing. The inner housing has an inner housing inlet port at the tip inlet end in communication with an inner housing outlet opening at the tip outlet end via an inner tip passage. The outer housing surrounds the inner housing. The outer housing includes an outer housing inlet port at the tip inlet end in communication with an outer housing outlet opening at the tip outlet end via an outer tip passage created between the inner housing and the outer housing. The outer housing outlet opening and the inner housing outlet opening are at approximately the tip outlet end, where the outer housing outlet opening surrounding the inner housing outlet opening.

A plumber's heat shield comprises an arcuate preferably metallic shell attached to a spring-clamp by means of an obedient shaft which enables the heat shield to be moved to any position relative to the spring-clamp. The arcuate shell is preferably formed from aluminum or other material having high infrared reflectivity. The obedient shaft is preferably formed from helically-wound steel spring outer sheath surrounding a ductile copper wire core. The spring steel outer sheath prevents the ductile copper wire core from being bent at too sharp of a radius (which would cause the ductile core to work-harden and fracture) while at the same time protecting the ductile copper wire core from the open-flame of the soldering torch.

A plumber's heat shield comprises an arcuate preferably metallic shell attached to a spring-clamp by means of an obedient shaft which enables the heat shield to be moved to any position relative to the spring-clamp. The arcuate shell is preferably formed from aluminum or other material having high infrared reflectivity. The obedient shaft is preferably formed from helically-wound steel spring outer sheath surrounding a ductile copper wire core. The spring steel outer sheath prevents the ductile copper wire core from being bent at too sharp of a radius (which would cause the ductile core to work-harden and fracture) while at the same time protecting the ductile copper wire core from the open-flame of the soldering torch.

A vibration dampening device for the manufacture by rotational friction welding of a turbomachine rotor including a first disc and a second disc each having a hub with an internal surface is provided. The device includes a first clamping device configured to be positioned coaxially to the hub of the first disc and having a pair of radially opposite jaws suited to come into contact with the internal surface of the hub of the first disc.

An arrangement for measuring the quantity of protective gas for robot-controlled importable welding torches with a protective gas nozzle in the measuring arrangement, characterized in that the measuring arrangement includes a spring-mounted receiving cup in the direction of the insertion of a welding torch in and/or with the measuring arrangement, with a sealing ring surrounding the welding torch on its outer circumference.

A welding or cutting tool for welding or cutting electrically conductive workpieces includes a nozzle arranged on a tool tip for discharging a welding or cutting beam and a nozzle cap which at least partly surrounds the nozzle, is open towards the tool tip, and has an electrode that forms a capacitance with the respective workpiece and an insulating element that electrically insulates the electrode from the other components of the tool. The electrode consists of a first electrically conductive ceramic material and is formed integrally with the insulating element, which consists of a second electrically insulating ceramic material.

A welding or cutting tool for welding or cutting electrically conductive workpieces includes a nozzle arranged on a tool tip for discharging a welding or cutting beam and a nozzle cap which at least partly surrounds the nozzle, is open towards the tool tip, and has an electrode that forms a capacitance with the respective workpiece and an insulating element that electrically insulates the electrode from the other components of the tool. The electrode consists of a first electrically conductive ceramic material and is formed integrally with the insulating element, which consists of a second electrically insulating ceramic material.

An oxy-fuel system for supplying a torch with a fuel gas stored under pressure in a container includes the following components: (a) an upstream fuel gas supply line between the container and the torch; (b) a demand valve arranged in the upstream fuel gas supply line; (c) the torch connected to an oxygen supply line. The torch includes a venturi nozzle adapted to generate in the upstream fuel gas supply line a negative pressure P.sub.negative of at least 0.3 bar relative to atmospheric pressure in operating condition, and the demand valve is vacuum-controlled and configured to have a pressure setpoint to open the demand valve, the pressure setpoint being negative relative to atmospheric pressure and equal or less negative than P.sub.negative.

An oxy-fuel system for supplying a torch with a fuel gas stored under pressure in a container includes the following components: (a) an upstream fuel gas supply line between the container and the torch; (b) a demand valve arranged in the upstream fuel gas supply line; (c) the torch connected to an oxygen supply line. The torch includes a venturi nozzle adapted to generate in the upstream fuel gas supply line a negative pressure P.sub.negative of at least 0.3 bar relative to atmospheric pressure in operating condition, and the demand valve is vacuum-controlled and configured to have a pressure setpoint to open the demand valve, the pressure setpoint being negative relative to atmospheric pressure and equal or less negative than P.sub.negative.