As the joints pass through {HEAD ~ this target area} 42, the hot gas 43 melts {TAIL ~ the solder mounds} 
As the joints pass through { HEAD ~ this target area } 42 , the hot gas 43 melts { TAIL ~ the solder mounds }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL