Mitsubishi Heavy Industries Limited

The Kansai Electric Power Co., Inc.

The Tokyo Electric Power Company, Incorporated

Chubu Electric Power Company, Inc.

The Chugoku Electric Power Co., Inc.

Tohoku Electric Power Company, Inc.

Electric Power Development Co., Ltd.

Kyushu Electric Power Co., Inc.

Hokkaido Electric Power Company, Inc.

Shikoku Electric Power Co., Inc.

Hokuriku Electric Power Company

The Japan Atomic Power Company

Kazuhiko Kamo

Takahiro Ota

Hironori Onitsuka

Takeshi Yamamoto

Masahiro Kimura

Takashi Ishide

Koki Tateishi

Jiro Kasahara

Shuho Tsubota

Yusuke Sano

Takashi Akaba

Yusuke Hazui

Koji Okimura

Satoru Zenitani

Keisuke Kamitani

Naoki Suda

Naoki Yamasaki

Seiji Asada

Noriaki Sugimoto

Hirokazu Kadowaki

Yukihiro Sakaguchi

Itaru Muroya

Toshihide Nakano

Kazuhiro Wakabayashi

Yoshiyuki Hemmi

Yasushi Nishijima

A welding control device includes an actual position determination part configured to determine an actual position of the position control target on the basis of a weld characteristic amount detected from a captured image captured so as to include at least the position control target, the welding characteristic amount including at least one of a wire position of the weld wire or an electrode position of the electrode; a target position determination part configured to determine a target position being a target of the actual position corresponding to a weld condition for welding the weld target; and a position control part configured to execute a position control of the position control target to bring the actual position to the target position.

Welding control device, welding control method, and welding control program

A welding method includes welding a base material () of low alloy steel which is irradiated with neutrons using a welding material () of austenitic stainless steel.

Welding method, repairing method, and nuclear reactor vessel

A clad welding method, which can prevent the occurrence of incomplete fusion, and can cover the surface of a base material over a wide range with a weld metal, while suppressing the dilution of the weld metal, by use of a relatively simple technique, is provided. For this purpose, a welding heat input is increased at a location where one end () of a preceding weld bead () and the other end () of a succeeding weld bead () overlap, as compared with a welding heat input at a location where the preceding weld bead () and the succeeding weld bead () do not overlap, to produce a deep penetration portion () involving locally deep penetration ().

Clad welding method

A pipe diameter expansion apparatus includes: a hollow cylindrical member that can be placed in a pipe filled with water, and through which a coolant medium having a lower temperature than a freezing point of the water flows from one end to the other end; at least two plate-like fins provided to protrude outward from the cylindrical member; and a cold-heat insulator that is provided between the two fins, and reduces cold-heat transmission between inside and outside the cylindrical member.

Pipe diameter expansion apparatus and pipe diameter expansion method

An object is to provide a method and an apparatus for improving a residual stress in a tubular body, which are enabled to improve the residual stress reliably by clearly defining controlling rage for treatment conditions without depending on an installation state and configuration of the tubular body. When a cylindrical tubular body () is improved in its residual stress by locally irradiating an outer-circumferential surface of a welded portion (C) of the tubular body () with laser beams () and by moving an irradiation area (s) in an circumferential direction, a plurality thermocouples () are installed on the tubular body () to be improved, a temperature history of the outer surface of the tubular body () by the irradiation of the laser beam () is managed by measuring the temperature history itself.

Method for improving residual stress in tubular body

An object is to provide a method and an apparatus for improving a residual stress in a tubular body, which are enabled to improve the residual stress reliably by clearly defining controlling rage for treatment conditions without depending on an installation state and configuration of the tubular body. When an outer-circumferential surface of a welded portion of a cylindrical tubular body () is irradiated with a laser beam that circles around an outer circumference of the tubular body (), a heating width W in a circumferential direction heated by the laser-beam irradiation and a laser-beam moving speed V in the circumferential direction are set so that a stress in the circumferential direction in an inner surface of the tubular body () produced by the heating with the laser beam is at least larger than a yielding stress of a material that the tubular body () is made of.

Method for improving residual stress in tubular body and apparatus for improving residual stress in tubular body

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Takasago, Japan

Kazuhiko Kamo