Abstract:
According to the present invention, penetrators can be adequately determined as flaws. In particular, a welded zone 2 of a pipe 1 is subjected to ultrasonic flaw detection at least in a pipe axial direction, and the quality of the pipe is evaluated using observed values in units of a predetermined area in a pipe thickness direction and the pipe axial direction. The length of one side of the predetermined area is an ultrasound beam width or more and a pipe thickness or less. The quality of the pipe can be evaluated while shifting the predetermined area in the pipe axial direction by using an average value of the observed values within the predetermined area. The length of one side of the predetermined area can be made an ultrasound beam width or more and a pipe thickness or less.
Abstract:
Un método para fabricar una tubería (7) de acero mediante soldadura por resistencia eléctrica que incluye las etapas de conformar una tira (1) de acero en forma de tubería (4) abierta sustancialmente tubular y soldar ambos bordes (4a, 4b) de la tubería (4) abierta mediante soldadura por resistencia eléctrica, comprendiendo el método la etapa de: previamente a la soldadura por resistencia eléctrica, aplicar una forma (5a, 5b) ahusada a cada uno de los bordes (4a, 4b) de la tubería (4) abierta; medir la forma (5a, 5b) ahusada antes de la soldadura por resistencia eléctrica; medir una cantidad de óxido en la porción soldada después de la soldadura por resistencia eléctrica; y ajustar una potencia eléctrica de soldadura para la soldadura por resistencia eléctrica basándose en los resultados de medición de la medición de la forma ahusada y la medida de la cantidad de óxido.
Abstract:
An ultrasonic flaw detection apparatus 1 includes: an ultrasonic flaw detection sensor head 11 installed downstream from a seam detection unit 13; a seam position calculation unit 14a that calculates a seam position and a bead cutting position of an electric resistance welded pipe P by using a thermal image of a welded seam portion captured by the seam detection unit 13; a bead cutting band detection unit 15 that is installed immediately before or immediately after the ultrasonic flaw detection sensor head 11 and that detects a bead cutting band of the electric resistance welded pipe P; a bead cutting position calculation unit 14c that calculates a bead cutting position of the electric resistance welded pipe P; and a tracking movement amount calculation unit 14d that calculates a tracking movement amount of the ultrasonic flaw detection sensor head 11.
Abstract:
Defect judgment of a penetrator can be made precisely. Ultrasonic flaw de tection of a welded portion (2) of a tubular body (1) is performed at least in the axial direction of the tube, and the quality of the tubular body is e valuated using the measurement values in units of predetermined area in the thickness direction and the axial direction of tube. Length of one side of t he predetermined area is set longer than the ultrasonic beam size but shorte r than the tube thickness and, while shifting the predetermined area in the axial direction or the thickness direction of the tube, the quality of the t ubular body can be evaluated using the average measurement value in the pred etermined area. Length of one side of the predetermined area may be set long er than the width of ultrasonic beam but shorter than the tube thickness.
Abstract:
Dispersed penetraters in which oxide particles of several micrometers are dispersed widely and in a thin region can be detected. Specifically, an ult rasonic test device comprises a transmitting/receiving unit which has a tran smitting section (6) for transmitting an ultrasonic wave toward the welded s urface of the welded part (2) of a tubular object (1) in the axial direction in such a way that a transmitted beam (8) has a beam width lying in the ran ge from 0.5 mm to 2.5 mm and a receiving section (7) for receiving a part or the whole (received wave beam (9)) of the reflected wave at the welded surf ace, and in which the transmitting section (6) and the receiving section (7) are composed of different vibrator groups on one or more array probes (5) a rranged in the circumferential direction of the tubular object.
Abstract:
An object is to provide a laser beam welding diagnosis apparatus and a laser beam welding diagnosis method, which enable diagnosis of a laser beam welding state by detection of whether or not a penetrated welding state is maintained in a laser beam welded portion. A configuration therefor is a laser beam welding diagnosis apparatus that performs diagnosis of a laser beam welded portion 5 of a welded pipe welded by butting both edges of a steel strip 1 against each other and irradiating a butted portion with a laser beam 7, and the configuration includes an imaging unit 8, which continuously captures images of a laser beam welding penetration side of the laser beam welded portion 5, a feature amount calculating unit 11, which calculates, from an image captured by the imaging unit 8, a feature amount of a jetted portion accompanying laser beam welding penetration, a welding diagnosis unit 12, which determines that a welding defect in the laser beam welded portion 5 has occurred when values of the feature amounts in a predetermined area of the images continuously obtained become equal to or less than a predetermined value for a predetermined duration or longer, and a display unit 13, which displays and outputs a welding quality state including the occurrence of the welding defect.
Abstract:
This ultrasonic flaw detection device (1) is provided with: a sensor head (11) for ultrasonic flaw detection that is disposed downstream of a seam detection unit (13); a seam position calculation unit (14a) that calculates a seam position and bead cutting position of a seam-welded pipe (P) using a thermal image of a weld seam portion captured by the seam detection unit (13); a bead cut band detection unit (15) that is disposed just before or just after the sensor head (11) for ultrasonic flaw detection and detects a bead cut band of the seam-welded pipe (P); a bead cutting position calculation unit (14c) that calculates the bead cutting position of the seam-welded pipe (P) on the basis of the bead cut band detected by the bead cut band detection unit (15); and a following movement amount calculation unit (14d) that calculates the amount of following movement of the sensor head (11) for ultrasonic flaw detection using the seam position and bead cutting position calculated by the seam position calculation unit (14a) and the bead cutting position calculated by the bead cutting position calculation unit (14c).