Patent Number: 6,332,361

Title: Method for evaluating bonding properties of a metallic pipe

Abstract: A method for evaluating bonding properties of a metallic pipe, the method comprises steps of measuring, in advance of a pipe expansion operation, at least one selected from a degree of shape discontinuity, a degree of defect at a bonding portion, and a degree of change in crystal structure, and comparing a measurement value with a predetermined threshold value to evaluate suitability of the bonding properties for applying pipe expansion.

Inventors: Yamada; Ryuzo (Chita, JP), Horio; Hirotsugu (Tokai, JP), Shimizu; Takao (Nogoya, JP)

Assignee: Daido Tokushuko Kabushiki Kaisha

International Classification: G01N 29/40 (20060101); G01N 29/11 (20060101); G01N 29/36 (20060101); G01N 29/04 (20060101); G01N 029/00 ()

Expiration Date: 12/25/2018