PURPOSE: To highly precisely execute the alignment of a mutual joint of tubes by guiding inner diameter of tubes to the same center with plural guide segments by supplying the pressure fluid to a central cylinder. ;CONSTITUTION: When a hydraulic oil is supplied from a port 1a to a cylinder 1, the relational position of a piston rod 2 and the cylinder 1 attached with screwing to a sleeve 3 is changed. The relational position of a link rod 6 supported with pivot to a central bracket 1c of the cylinder 1 and a link rod 7 supported with pivot to a bracket 3b of the sleeve 3 is changed. Because the movement of the link rod 7 is restricted a coil spring 8, so the link rod 6 begins to move at first. Segments supported with pivot to the link rods 6, 7 are abutted at first with a tube 50, and the insertion of a tube 51 is made easy. When the hydraulic oil is fully supplied, the segment 5 is expanded until fixing the tubes 50, 51 in the same center. The jig does not obstruct welding of the butt part.;COPYRIGHT: (C)1994,JPO&Japio
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