Ultrasonic flaw detection device and ultrasonic flaw detection method

Abstract

The ultrasonic flaw detection device (1) includes: a sensor head (11) for ultrasonic flaw detection, which is arranged on the downstream side of the weld seam detection part (13); a weld seam position calculation part (14a), which uses Calculate the weld seam position and weld bead cutting position of the electric welded steel pipe (P) based on the thermal image of the welded seam part; the weld bead cutting zone detection part (15) is arranged immediately before the sensor head (11) for ultrasonic flaw detection or immediately after, and detect the weld bead cutting zone of the electric welded steel pipe (P); the weld bead cutting position computing unit (14c), calculates the electric welded steel pipe (P) based on the weld bead cutting zone detected by the weld bead cutting zone detection unit (15) P) the weld bead cutting position; and the tracking movement amount calculation unit (14d), using the weld seam position and the weld bead cutting position calculated by the weld bead position calculation unit (14a) and the weld bead cutting position calculation unit (14c) The calculated weld bead cutting position is used to calculate the tracking movement amount of the sensor head (11) for ultrasonic flaw detection.

Description

technical field [0001] The present invention relates to an ultrasonic flaw detection device and an ultrasonic flaw detection method for ultrasonic flaw detection of welded seam portions of electric welded steel pipes. Background technique [0002] Generally, an electric resistance welded steel pipe is manufactured by forming a steel sheet into a tubular shape, and welding and joining both ends of the steel sheet in the width direction while being pressed against each other. In the manufacturing process of such an electric welded steel pipe, in order to obtain good welding quality, the electric welded steel pipe uses an ultrasonic flaw detection device to perform ultrasonic flaw detection on the welded seam part, and anneals the welded seam part through a weld seam annealing furnace (for welding Tempering treatment is carried out on the welded seam portion close to the quenched state), thereby proceeding to productization. [0003] When ultrasonic flaw detection is performed...

AI Technical Summary

Problems solved by technology

[0004] However, electric welded steel pipes are subjected to various forces on the manufacturing line, so the welded seam is not necessarily located on the center line of the sensor head, and there are cases where it is offset in the direction of the pipe circumference relative to the center line of the sensor head

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