| 摘要 |
PURPOSE: An expansion joint for gas transfer and a manufacturing method thereof are provided to simplify a manufacturing process by combining first and second flanges with a corrugated pipe body without additional connection unit. CONSTITUTION: A corrugated pipe body(10) includes a wrinkle(11) and first and second non-corrugation ends(12,13). First and second flanges(20,30) are fitted in the first and second non-corrugation ends. First and second separation preventing ends(40,50) are connected with the first and second non-corrugation ends. The first and second separation preventing ends are greater than inner circumferences of the first and second flanges in order for the first and second flanges not to be separated.
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