Patent ID: 8525067
Filing Date: 2013-09-03
Classification: B23K

Abstract:
1. A process for the jet cutting of arcuate openings having a predetermined perimeter in a metal workpiece comprising the steps of; creating a high temperature plasma gas cutting jet at a jet nozzle and directing said jet along a predetermined axis, at a start point inside said perimeter; applying the cutting jet to the work piece, with the axis of the cutting jet offset from the perpendicular; moving said jet along a generally spiral cut path directed outwardly from the start point until it reaches said perimeter; moving the jet around to describe the cut path of the perimeter desired while maintaining the non perpendicular axis; terminating the plasma jet, at a preselected position when the jet is nearing completion of the cut path and prior to completion of the perimeter cut path; and, moving the jet nozzle on a path back in from the perimeter cutpath and directing it inwardly towards the start point.