Electric arc welder and {HEAD ~ method} for controlling {TAIL ~ the welding process} of the welder 
for controlling
Electric arc welder and { HEAD ~ method } for controlling { TAIL ~ the welding process } of the welder
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH