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