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