Method for the fabrication of internally weld-cladded pipe elbows
AssigneeSulzer Brothers Limited
InventorAlfred Ludwig
Life of this patent
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Abstract
The weld-cladding apparatus includes a turntable which is rotatably mounted in a yoke about a horizontal axis. An outrigger is mounted on the yoke and has a curvature coincident to the curvature of the torus-to-be-cladded and a center of curvature on the axis of the turntable. The weld-cladding means is rotatably mounted at the end of the outrigger in a vertical plane common to the plane in which the pivot axis of the turntable moves during rotation of the yoke. During use, the weld-cladding means remains vertical while the turntable pivots on the horizontal axis. In order to form a weld, the turntable is oscillated back and forth about the pivot axis over an arcuate length equal to the length of the torus. The turntable is tilted incrementally a distance equal to the width of a weld.
Claims2
A method of internally weld-cladding a toroidal body, said method comprising the steps of
- forming a pair of torus-sector half-shells;
- machining the edges of each half-shell;
- subsequently welding the half-shells together into a toroidal body;
- straightening and heat treating the toroidal body;
- thereafter applying a weld-clad along tangential generatrix lines on the inside of the toroidal body;
- and
- subsequently stress-annealing the weld-cladded toroidal body.
Dependencies are inferred from the claim text.