L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

L'air Liquide

Pierre Legrand

Michel Delzenne

Michel Arnout

Eric Verna

Bernard Reynaud

Pierre Gaillard

Jean-Francois Hays

Arc torch for plasma arc cutting or welding comprising an interchangeable cartridge comprising an electrode and a nozzle, and connecting elements between the cartridge and the body of the arc torch to axially insert and remove the cartridge by a purely rectilinear movement. The arc torch can be used as part of a machine comprising a station for extracting used cartridges and a station for loading new cartridges into the arc torch.

Arc working torch and machine, and cartridge for said torch

Process for striking an arc in electric welding and welding torch

A high frequency-high voltage generator supplies current, on one hand, to a first arc striking circuit connecting a main electrode to an auxiliary electrode and, on the other hand, to a second arc striking circuit which connects one of the two electrodes to the workpiece to be treated. In this way there is achieved a striking of the arc in two stages. This ensures high reliability regardless of the nature of the material from which the workpiece is made regardless of the protecting gas used, in particular for the TIG welding of light alloys in a helium atmosphere. The device is applicable to an automatic TIG welding.

High-frequency arc striking device and auxiliary electrode of an

Growing community of inventors

Pontoise, France

Pierre Legrand