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Onuma; Tsutomu
Hitachi, JP
No. of patents:

Patent Number Title Of Patent Date Issued
5977515 Underwater laser processing device including chamber with partitioning wall November 2, 1999
An underwater laser processing system has a laser torch; a laser torch driving mechanism for changing a laser emission position of the laser torch; and a chamber with one end opened to an external environment, which contains the laser torch; wherein a partitioning wall for preventing
5938954 Submerged laser beam irradiation equipment August 17, 1999
A submerged laser beam irradiation equipment provides a high quality submerged laser beam processing of a submerged workpiece using only a small amount of a gas. The submerged laser beam irradiation equipment has: a focus lens for focusing a laser beam; a mirror tube which houses the
5879132 Stainless steel type 13Cr5Ni having high toughness, and usage of the same March 9, 1999
An ultra high head pumpturbine power generating plant with a turbine having a runner rotating with water flow supplied through a high head conducting tube. A rotary electric machine rotates with rotation of the runner. The head is in the range of 400-600 m, and the runner is at least 5 m
5654992 Method of repairing structural materials of nuclear reactor internals and apparatus therefor August 5, 1997
A neutron-irradiated structural material having a defect in a nuclear reactor internals is repaired by covering the structural material to be repaired with a plate to cover over a portion thereof having the defect, and then welding the plate and the structural material by locally applyin
5628449 Method of welding a carbon steel and an austenitic stainless steel together and resultant struct May 13, 1997
Method of welding a carbon steel and a austenitic stainless steel involves using high density energy beam like a laser beam or electron beam. Welding using high density energy beam is effective to obtain a high precision welding. For the purpose of obtaining both high precision and no cr
5601411 Stainless steel type 13Cr5Ni having high toughness, and usage the same February 11, 1997
High toughness stainless steel type 13Cr5Ni containing C: 0.008-0.03% (by weight, all of the following elements), Si: max. 1%, Mn: max. 2%, Cr: 10.0-14.0%, Ni: 4.0-7.0%, and Mo: 0.2-2.0%, in which (Cr/Ni) ratio is in a range of 2.0-3.0 or (C/Mo) ratio is in a range of 0.015-0.1, as a
4499158 Welded structural member having high erosion resistance February 12, 1985
A welded structural member adapted to be subjected to a flowing fluid and comprising a base member consisting mainly of iron and a coating layer formed by a build-up welding on the surface of the base member, the coating layer having a higher erosion resistance than the base member. The
4348131 Welded structure having improved mechanical strength and process for making same September 7, 1982
A welded structure and a method for making same wherein a plurality of weld metals, such as martensitic steel and austenitic steel, differing in coefficient of thermal expansion from each other are deposited in a plurality of layers thicknesswise of the welded structure in a gap defined

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