Method and apparatus for positioning a plasma arc cutting torch

Details Method and apparatus for positioning a plasma arc cutting torch Method and apparatus for positioning a plasma arc cutting torch

H - Electricity

05

B

327/54

H05B 7/152 (2006.01) B23K 10/00 (2006.01)

Patent

CA 1098181

ABSTRACT OF THE DISCLOSURE The positioning method disclosed herein is particularly applicable to a plasma arc cutting torch of the type in which tangential swirl is imparted to an ionizable gas through which the arc discharge takes place. The gas flow is initiated while the torch is in a retracted position and the torch is then advanced toward the workpiece. The vortex pressure is sensed and a signal is generated which is responsive to changes in vortex pressure. The advance of the torch is terminated in response to a change in the signal corresponding to the abrupt drop in the vortex pressure caused by attachment of the vortex to the workpiece.

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