| 摘要 |
A long-neck flange manufacturing method which substantially improves welding strength by reducing a local welding defective portion, and substantially reduces cost and time due to the manual operation by mechanically bonding a connection part and a flange part within a short period of time is provided. A method for manufacturing a long-neck flange comprises the steps of: (a) forming a coupling end(200) having a sideline(202) at one end of a connection part(300); (b) forming a coupling port(102) having a shape corresponding to that of the coupling end at a predetermined location of a flange part(100); (c) advancing the connection part to the coupling port formed on the flange part while rotating the connection part around a longitudinal axis of the connection part at a high speed; and (d) consolidating the coupling end formed on the connection part onto the coupling port, thereby melting the coupling end by friction heat, and bonding the coupling end to the coupling port. The coupling end is formed in such a way that the sideline has an angle of 45 to 70 degrees relative to the longitudinal axis of the connection part.
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