Babcock-hitachi Kabushiki Kaisha

Other

Toshiharu Nagashima

Toshiharu Myoga

Keiji Ueda

Seiji Kikuhara

Hiroshi Watanabe

Shigeru Fujimoto

Masahiro Kanatani

Koichi Mitsuhata

Kouichi Kurosawa

Katsuhiko Hirano

Nobuyoshi Ishida

Katsuyoshi Hori

Toshiaki Takuwa

Katsutaro Miyake

Takashi Sato

Kazuhiro Nitta

Nobuwo Nakazawa

Yosiaki Matsumura

Yukio Hosono

Tetsuji Terada

Ryuichi Etoh

Yuji Futami

Yoshitoshi Suzuki

Shinji Go

Youichi Mahara

A welding head which can easily move the torch portion of the welding head in the circumferential direction and the vertical moving direction of the outer circumference of the to-be-welded tubes even in a narrow gap, includes a torch rotating ring that rotates on the outer circumferences of the tubes by matching with the central axis of the to-be-welded tubes and a torch vertical moving ring disposed concentrically with the ring inside the ring, provided with a torch base for supporting a torch on the front ends, a first gear group for driving and rotating the ring around the tubes, a second gear group that is disposed in parallel to the first gear group and drives and rotates the ring around the tubes, a drive shaft for driving the two gear groups, and a torch rotating motor for driving the drive shaft, and a third gear group that can drive the ring while rotating it in the same direction as or in reverse to that of the ring at a speed equal to or higher or lower than that of the first gear group for rotating the ring around the tubes and vertically moving the torch, and a torch vertical moving motor for driving this third gear group.

All position automatic welding head and method for operating the same

An ultra-flat non-consumable electrode welding torch which allows performing a welding operation through a narrow gap between adjacent piping such as welding piping of a boiler panel, to be mounted on a compact automatic welding head, and a welding head provided with such a welding torch are to be provided. As a gas supply mechanism that supplies a shield gas to a welding section formed at the tip of the non-consumable electrode through inside of the torch body for the non-consumable electrode welding, a gas supply path is provided for supplying the shield gas from an outer gas space in a double ring shaped gas space provided around a non-consumable electrode and divided by a partition wall, to an inner gas space through a plurality of orifices provided at regular intervals in the partition wall, and the gas is blown from the inner gas space to the region around the non-consumable electrode through a metal mesh plate. A gas outlet opening provided in the inner gas space is oriented in a different direction from the gas blowing direction through the orifice.

Non-consumable electrode welding torch and welding head with the torch

An opening portion is produced by cutting a recirculating piping connected to a recirculating nozzle of a reactor pressure vessel A repairing device is brought into an annulus of the reactor pressure vessel from the opening thereby repairing the annulus

Device and method for repairing inside of reactor pressure vessel

An excellent welding tip in the feed stability of a wire, in the release capacity of foreign matter, and in the stability of current control, and a process for manufacturing such a tip economically, is achieved in accordance with a sectional shape of a guide hole opened and provided to a welding tip. The sectional shape is derived by forming a wire in a passable non-circular shape. The sectional shape of the guide hole may be a polygonal or elliptic shape, or approximately so. In the case of making the sectional shape of the guide hole polygonal, it is more preferable to make it a polygon circumscribing on a circle, for example, such a polygon circumscribing on a larger circle than the outer diameter of the wire to be inserted into the guide hole by 0.02-0.20 mm in diameter. Specifically, it is preferable to arrange the sectional shape as a triangle.

Tips for welding and their manufacturing process

There is proposed a process of continuously producing a catalyst plate, wherein a thin metal plate is formed by use of a blade with slits in the widthwise directions thereof, expanded in the longitudinal direction thereof into an expanded metal plate having formed therein meshes, the expanded metal plate thus formed is corrected in shape, degreased, thereafter, molten metal such as molen aluminum is sprayed onto the expanded metal plate to form roughened surfaces on the opposite sides of the expanded metal plate, further, a catalytic substance is deposited onto the roughened surfaces, thereafter, formed into a predetermined form, and shorn into pieces. There is proposed a pinch roll system having a tension roll, in which end portions in the widthwise direction are vertically movable so as to be used as a corrector for the expanded metal plate, and a stepping press system to be used as a former for the expanded metal plate.

Process of continuously producing plate-shaped catalyst and system

Growing community of inventors

Kure, Japan

Toshiharu Nagashima