In {TAIL ~ the present invention} the term “power factor” relates to the power factor of {HEAD ~ the welding process} 
In { TAIL ~ the present invention } the term “ power factor ” relates to the power factor of { HEAD ~ the welding process }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD