WELDED JOINT STRUCTURE OF DOUBLE HEAT TRANSFER PIPE

PROBLEM TO BE SOLVED: To provide a welded joint structure of a double heat transfer pipe in which a third fluid passage is not closed. SOLUTION: In a welded joint 10 of a double heat transfer pipe, an inner pipe 11 as an inner pipe member is butt-welded (an inner pipe welding part 11A) to an outer p...

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1. Verfasser: WATABE ICHIRO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a welded joint structure of a double heat transfer pipe in which a third fluid passage is not closed. SOLUTION: In a welded joint 10 of a double heat transfer pipe, an inner pipe 11 as an inner pipe member is butt-welded (an inner pipe welding part 11A) to an outer pipe by a laser welding from its inner peripheral surface side and an outer pipe 12 as an outer pipe member is butt-welded (an outer pipe welding part 12A) to the inner pipe from its outer outer peripheral surface side at a position axially spaced apart by a prescribed distance L from the welded position of the inner pipe 11.