| 摘要 |
PROBLEM TO BE SOLVED: To provide a perfect connection by locating the upper end face of a pipe inserted in the window center part of a jig base body having a window provided with upper and lower stoppers in an intermediate part of the sectional shape fitted to the outer shape of an inner pipe or a limit pipe inserted into the outer pipe of a freezing pipe, abutting a lower end face of a joined pipe inserted from an upper portion of the jig base body thereon, fixing it by the stoppers, and temporarily welding it from the window. SOLUTION: The center portion of a window 2 for temporary welding of a jig A for temporary welding is located at the upper part of an existing insertion pipe P1 of an outer pipe of a freezing pipe embedded in the perpendicular direction, and fixed to the existing insertion pipe P1 by a lower stopper 4. The lower portion of a joined pipe P2 is inserted into the upper portion of the existing insertion pipe P1 from an upper part or an open side surface of a jig base body 1, its end face is accurately abutted thereon, and the joined pipe 2 is fixed to the jig base body 1 by the upper stopper 3. An abutted surface is temporarily welded at least at three parts by a welding device from the window 2 for temporary welding, and then the jig A is detached, and the joined pipe P2 is permanently welded to the existing insertion pipe P1 with high accuracy.
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