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