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