abstract |
The present invention is a method for manufacturing a dome shaft of an insulating block of a sealed insulating tank, wherein the dome shaft 12 of a cylindrical shape extends over a length L in the longitudinal direction, and a plurality of metal sheets fixed to each other by welding. consisting of (11), bending (21) into a cylindrical or partially cylindrical metal sheet in such a way as to form a metal sheet cylinder (14), and then bending the metal sheet cylinder (14) to obtain a dome shaft (12) The method comprises a final step (17) of butt welding the forming metal sheet (11), wherein, before the step (21) of bending into a cylindrical or partially cylindrical shape, all the metal sheets 11 constituting the dome shaft 12 are . |