SEAM HEAT TREATMENT DEVICE AND SEAM HEAT TREATMENT METHOD OF ELECTROSEAMED STEEL PIPE

摘要

PROBLEM TO BE SOLVED: To provide a seam heat treatment device and a seam heat treatment method of an electroseamed steel pipe for improving seam follow-up accuracy of an inductor.SOLUTION: A seam heat treatment device comprises a heat pretreatment seam detection part 2 for imaging a welding seam part after bead cutting and before heat treatment, a heat pretreatment seam position arithmetic operation part 3 for arithmetically operating a position of the welding seam part from an imaged thermal image, a heat pretreatment bead cutting position arithmetic operation part 4 for arithmetically operating a position of a bead based on this thermal image, a heat post-treatment detection part 5 for imaging the welding seam part after the heat treatment, a heat post-treatment bead cutting position arithmetic operation part 6 for arithmetically operating a bead cutting position after the heat treatment, a heat post-treatment true seam position arithmetic operation part 7 for arithmetically operating a true seam position after the heat treatment from a dislocation quantity between a position of the welding seam part after the bead cutting and before the heat treatment and the bead cutting position before and after the heat treatment, a heat treatment position arithmetic operation part 8 for arithmetically operating a heat treatment position from the thermal image after the heat treatment, a heat post-treatment seam dislocation quantity arithmetic operation part 9 for arithmetically operating a seal dislocation quantity of the heat treatment position and the true seam position and a driving part 10 for driving an inductor 1 in the pipe circumferential direction by the seam dislocation quantity.SELECTED DRAWING: Figure 1