These processes have generally employed {HEAD ~ bonding aids}, such as brazing materials but use of such materials does not produce {TAIL ~ the high strength joints} which are necessary in gas turbine engines 
These processes have generally employed { HEAD ~ bonding aids } , such as brazing materials but use of such materials does not produce { TAIL ~ the high strength joints } which are necessary in gas turbine engines
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH