| 摘要 |
An assembly of at least two coaxial pipes having at least two coaxial pipe assembly unit elements, one of which has, at one end, a first junction part assembled to a second junction part at the end of another said coaxial pipe assembly unit element, each of said first and second junction parts being a body of revolution, wherein the ends of the two non-welded-together inner second branches of said first and second junction parts are in metal-on-metal contact one on the other under elastic deformation stress via their contact surface as a result of the shrinking of the weld between the ends of the two outer second branches of the junction parts, such that the inner second cavities are leaktight relative to the inside of the inner pipe. |
