High Efficiency Eddy Current Testing of Tubes with Flow Coating

The problem of non-destructive testing of rolled metal quality is considered in this article. Eddy current non-destructive testing is compared with X-ray radiography and ultrasonic testing, traditionally used in rolled metal manufacturing. Underwater crossing tubes of a large diameter are chosen as quality control objects. The reasons for the formation of local hardening zones are identified; microcracks occurring in the specified zones are studied. An overview of various methods used in manufacturing to control surface hardness is provided. The results of experimental studies using a hand eddy current defectoscope are presented. The studies were performed on a defected palette cut from a real tube of a large diameter. Measurement data for various working allowances are presented. A description of an automated line developed for high-speed non-destructive testing of external and internal walls of a tube through thick insulation coating is given.

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