Kawasaki Jukogyo Kabushiki Kaisha

Chubu Electric Power Company, Inc.

Kouyu Itoga

Shigetomo Matsui

Toshio Atsuta

Toshio Yoshida

Katsuhiro Onda

Takaaki Okumura

Hideyuki Hirasawa

Takamasa Ogata

Osamu Miki

Masahiro Uenishi

Kouji Michiba

Sadao Iuchi

Takaya Misumi

Tetsuzo Harada

Sumihiro Ueda

Yuji Sugita

Harutaka Koike

Kouji Sugimoto

Hiroo Owaki

Ultrasonic defect testing method and apparatus

A radiographic test is conducted on a welded portion of a pipe or the like to form a radiographic image, which is introduced into a computer. Volumetric defects and planar defects in the radiographic image are emphasized and extracted by separate methods to obtain a volumetric candidate defect image and a planar candidate defect image. The candidate defect images are then combined to form a single image in which defects can be easily identified. Features of defects in the images are measured, and a set of interference rules is applied to the measured features. Each inference rule gives a degree of certainty that a defect is of a certain type. The degrees of certainty determined by a plurality of the rules are collated to obtain a total degree of certainty, and the type of a defect is inferred from the total degree of certainty.

Method of processing radiographic image data for detecting a welding

A corrosion-resistant pipe coupling made of carbon steel has on its inner surface an intermediate annular projection directed radially inward. At least an innermost part of the annular projection is formed of corrosion-resistant material such as stainless steel. The annular projection may be covered by a corrosion-resistant annular member which is secured by friction welding, electron beam welding, an adhesive or mechanical engagement. The annular member prevents corrosion of the coupling by corrosive fluids flowing in pipes.

Corrosion-resistant pipe coupling structures

A corrosion-resistant pipe coupling made of carbon steel has on its inner surface an intermediate annular projection directed radially inward. At least an innermost part of the annular projection is formed or corrosion-resistant material such as stainless steel. The annular projection is covered by a corrosion-resistant annular member or which is secured by friction welding, electron beam welding, an adhesive or mechanical engagement. The annular member prevents corrosion of the coupling by corrosive fluids flowing in pipes.

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Kobe, Japan

Kouyu Itoga