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