INSPECTION METHOD AND INSPECTION SYSTEM FOR ADHESIVE STRENGTH OF RESIN COATING STEEL TUBE AND MANUFACTURING METHOD OF RESIN COATING STEEL TUBE USING INSPECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an inspection method capable of nondestructively evaluating adhesive strength between a steel tube and a resin coating layer in an arbitrary region of a resin coating steel tube.SOLUTION: In an inspection method of adhesive strength of a resin coating steel tube, absorbance of an adhesive layer is measured after a process for forming the adhesive layer on an outer peripheral surface of the steel tube and before a process for coating fused resin on the outer peripheral surface of the steel tube during obtaining the resin coating steel tube. Thereafter, based on the measured absorbance, adhesive strength of the steel tube with the resin coating layer of the obtained resin coating steel tube is evaluated.SELECTED DRAWING: Figure 1