Improved welding apparatus and method

B - Operations – Transporting – 23 – K

Patent

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B23K 10/00 (2006.01)

Patent

CA 2351486

The invention provides a plasma welding or brazing process in which a direct current pilot arc is maintained throughout the process. The process comprises the steps of setting a pilot arc power supply (6) to a relatively high level, generating a high voltage spark discharge between a non-consumable electrode (14) of a plasma welding or brazing torch (2) and a nozzle (18) of said torch in order to start the flow of a pilot arc current, detecting the pilot arc current and reducing the pilot arc current to a relatively low level. The invention further provides apparatus for carrying out plasma arc welding, comprising a plasma welding torch, a controller and a power supply. The controller further comprises means for detecting the flow of a pilot arc current and or a main arc current and means for reducing this current on detection.

L'invention concerne un processus de soudage ou de brasage à plasma dans lequel un arc pilote à courant continu est maintenu dans tout le processus. Le processus comprend les étapes consistant à établir une alimentation (6) d'arc pilote à un niveau relativement élevé, à produire une décharge à étincelles de haute tension entre une électrode non consommable (14) d'une torche de soudage ou de brasage (2) à plasma et une buse (18) de ladite torche afin de démarrer le passage d'un courant d'arc pilote, à détecter le courant d'arc pilote et à réduire le courant d'arc pilote à un niveau relativement bas. L'invention concerne également un appareil de mise en oeuvre du soudage à arc de plasma comprenant une torche de soudage à plasma, un régulateur et une alimentation. Le régulateur comprend également un moyen de détection du passage d'un courant d'arc pilote et/ou un courant d'arc principal, ainsi qu'un moyen de réduction de ce courant lors de la détection.

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