Contact start plasma arc torch and method of initiating a...

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 10/00 (2006.01)

Patent

CA 2477322

A contact start plasma arc torch (120) is provided that comprises an electrode, a tip, and an initiator (50) that is resiliently biased into contact with the tip (40), the initiator being movable against the resilient bias to separate from the tip and establish a pilot arc between the initiator and the tip. The initiator is disposed within a start cartridge (42), which preferably comprises a coil spring that biases the initiator into contact with the tip. The plasma arc torch (12) further comprises a plurality of head vent holes to vent gas from within the start cartridge during operation of the torch. Additionally, the tip defines a plurality of swirl holes and secondary gas holes to generate and control a plasma stream that is subsequently blown from a central exit orifice in the tip.

L'invention porte sur un chalumeau à arc de plasma à démarrage par contact (120) doté d'une électrode, d'une pointe et d'un amorceur (50) qui est mis en contact de manière élastique avec la pointe (40), cet amorceur pouvant être déplacé contre le contact élastique afin de se séparer de la pointe et de placer un arc pilote entre l'amorceur et la pointe. Cet amorceur est installé entre l'amorceur et la pointe. L'amorceur est placé à l'intérieur d'une cartouche d'amorce (42), qui comprend de préférence un ressort hélicoïdal qui met l'amorceur en contact avec la pointe. Le chalumeau à arc de plasma (12) est également doté d'une pluralité de trous de ventilation à tête servant à ventiler le gaz à l'intérieur de la cartouche d'amorce au cours du fonctionnement du chalumeau. De plus, la pointe définit une pluralité de trous en spirale et des trous à gaz secondaires afin de générer et de contrôler un courant de plasma qui est par la suite évacué d'un orifice de sortie central de la pointe.

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