It is another object of the present invention to provide a joining method of the type described above, wherein {HEAD ~ the need} for a joining jig which is required in use of a butt welding joint is eliminated to provide {TAIL ~ an improved joining operatability} 
is eliminated to provide
It is another object of the present invention to provide a joining method of the type described above , wherein { HEAD ~ the need } for a joining jig which is required in use of a butt welding joint is eliminated to provide { TAIL ~ an improved joining operatability }
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 HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL