Hitachi, Ltd.

Tsuyoshi Fujii

Masakuni Ezumi

Isao Yanagida

Ryooji Ishida

Masami Ogata

A rotary tool ( ) is relatively moved against members ( ) to be welded so as to perform friction stir welding of said members, while blades ( ) mounted on the rotary tool ( ) and a rotary brush ( ) are used to cut the welded portion, and swarfs on the cut surface are removed through a suction opening ( ), before medium liquid is supplied on said cut surface through a supply opening ( ). Next, an inspection roller ( ) is rotated on the surface of the welded portion for inspection. A probe ( ) is provided within the roller ( ). Upon detecting a defect, paint is applied to the position of defect by a marking device ( ). Thereafter, based on said marking, the joint portion is cut and repaired by welding.

Nondestructive inspection method

A runner liner of fluid machine which can be attached and detached to and from the runner of the fluid machine without necessitating the disassembling of the latter. The runner liner can be fitted to a groove which is formed in the periphery of the runner, and is divided into a plurality of segments each of which being so sized that it can be brought into the runner chamber through anyone of the fluid passages coming into and out of the runner chamber. The attaching of the runner liner to the periphery of the runner is made by making use of pockets formed in the head cover and the bottom cover which in combination define the runner chamber.

Growing community of inventors

Kudamatsu, Japan

Tsuyoshi Fujii