The wire driving roller 30 and the wire compression roller 32 being positioned on either side of the welding wire 1 and {HEAD ~ each} being in contact with {TAIL ~ the welding wire} 1 impose a laterally opposed compressive force upon the welding wire 1, increasing the friction between the welding wire 1 and the wire driving channel 35 
The wire driving roller 30 and the wire compression roller 32 being positioned on either side of the welding wire 1 and { HEAD ~ each } being in contact with { TAIL ~ the welding wire } 1 impose a laterally opposed compressive force upon the welding wire 1 , increasing the friction between the welding wire 1 and the wire driving channel 35
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH