The torch is caused to make short and relatively rapid transverse oscillations of sweep across the width of a swath along the workpiece, the swath developing in the course of a relatively slow feed of the torch with {HEAD ~ respect} to {TAIL ~ the workpiece} 
to
The torch is caused to make short and relatively rapid transverse oscillations of sweep across the width of a swath along the workpiece , the swath developing in the course of a relatively slow feed of the torch with { HEAD ~ respect } to { TAIL ~ the workpiece }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL