{TAIL ~ Electric arc welder} performs a given weld process with selected current waveform performed between {HEAD ~ electrode} and workpiece  
{ TAIL ~ Electric arc welder } performs a given weld process with selected current waveform performed between { HEAD ~ electrode } and workpiece
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH