The workpiece may be a single piece of material or a plurality of pieces of material which are bonded together under {HEAD ~ the influence} of {TAIL ~ heat} and pressure 
The workpiece may be a single piece of material or a plurality of pieces of material which are bonded together under { HEAD ~ the influence } of { TAIL ~ heat } and pressure
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 HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH