Abstract:
PROBLEM TO BE SOLVED: To provide a heat treatment method of an electric resistance welded pipe for performing heat treatment after a welded part determined by using a temperature distribution in the vicinity of the welded part, when performing the heat treatment of the welded part of the electric resistance welded pipe.SOLUTION: In an electric resistance welded tube production line disposed of a heat treatment apparatus with a plurality of inductors in a downstream side of a bead trimmer, the heat treatment of a welded part after bead cutting is performed by the heat treatment apparatus. In that case, the position of the welded part in a steel pipe exterior surface is determined, based on temperature distribution of the steel pipe exterior surface in the vicinity of the welded part after the bead cutting and after the heat treatment. Then the inductors of the heat treatment apparatus are controlled so as to follow after the welded part.
Abstract:
PROBLEM TO BE SOLVED: To reflect a hydraulic tester on optimization of the next process condition by adding a scaling function to a series of test processes of the hydraulic tester.SOLUTION: Migration length of both head parts 1, 2 in a hydraulic test are measured by a pulse generator system, laser type position sensors 4, 4for detecting pipe end positions of a steel pipe are installed at the respective head parts, the respective head parts are moved to match laser optical paths of the laser type position sensors to a predetermined origin before setting of the steel pipe 3, pieces of the migration length of the respective head parts are measured from a point of time when the laser optical paths are matched to the predetermined origin to a point of time when the respective laser type position sensors detect the pipe end positions of the steel pipe when the respective head parts are separated from the steel pipe via the hydraulic test, and pipe length of the steel pipe is calculated by using this measurement result.