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