To provide a method for temporary fixing a vacuum weld zone and a temporary fixing structure, which suppress entering of water through a gap of a temporary fixed portion between a metal pipe and a metal plug at their butting portion, so that vacuuming time can be considerably shortened and quality can be improved.
A method for temporary fixing a vacuum weld zone includes: metal plugs 3 and 4 butting to both ends of a metal pipe 2 having a superconductive material 1 contained therein for formation of butting parts 5 and 6, vacuuming the inside of the metal pipe 2 in a vacuum chamber, as well as joining the butting parts 5 and 6 by high energy density welding to vacuum-seal both the ends of the metal pipe 2 by metal plugs 3 and 4 thereby forming a superconductive billet, in which the metal pipe 2 and the metal plugs 3 and 4 of the butting parts 5 and 6 are temporary fixed preceding to the high energy density welding. In this method, the metal pipe 2 and the metal plugs 3 and 4 are temporary fixed by winding a resin tape 7 having a water permeability of 10 g/(m2/24 hr/0.1 mm) or less to the butting parts 5 and 6 in a bandage-like manner.
KIMURA MORIO
SAKURAI YOSHIHIRO
OHATA KAZUMI
WADAYAMA YOSHIHIDE
TAGAWA KOHEI
