F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 13/04 (2006.01) B23K 31/02 (2006.01) B23K 37/00 (2006.01) F16L 13/02 (2006.01)
Patent
CA 2706360
Residual stress in a butt-welded part of a pipe is improved where the butt-welded part is welded by abutting pipes to be welded. An outer surface of the pipe is cooled at each side of the butt-welded part to form ice plugs defining a watertight space therebetween inside the pipe. An outer surface of the pipe is cooled defining the watertight space to increase a water pressure in the watertight space to expand the butt-welded part of the watertight space in the pipe. A strain on the outer surface of the pipe is measured with a strain gauge at the butt-welded part to confirm that the outer surface of the pipe at the butt-welded part starts to plastically deform. In order to cool the outer surface of the pipe defining the watertight space, the above process is stopped.
Aoike Satoru
Hisatsune Masakazu
Hitachi-Ge Nuclear Energy Ltd.
Kirby Eades Gale Baker
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