Abstract: Conducted are coal-ash generating step for generating coal ash, sintered-ash generating step for heating the coal ash at temperatures within combustion temperature range of coal-fired boiler to generate sintered ash at each heating temperature, sticking-degree calculating step for rotatively separating each sintered ash by ratra tester to calculate sticking degree from weight ratio of each sintered ash after and before the rotary separation of the sintered ash, correlation determining step for burning each coal having corresponding sticking degree calculated to measure exhaust gas temperature and obtain correlation between sticking degrees and exhaust gas temperatures, exhaust-gas-temperature predicting step for predicting exhaust gas temperature from sticking degree of coal to be employed as fuel based on the correlation between the sticking degrees and the exhaust gas temperatures and adhesion predicting step for predicting ash adhesion in the coal-fired boiler based on the exhaust gas temperature predicted

Abstract: A tack welding method and a tack welding apparatus that can improve the strength of a tack-welded joint portion and reduce the height of a reinforcement bead is provided. A tack welding method of the present embodiment is a tack welding method of tack-welding a part of a joint portion of a first joint and a second joint at a predetermined interval before main welding. In the tack welding method, a filler metal is supplied to the joint portion, laser light is deflected and irradiated to the joint portion, and the filler metal is cut with the laser light to be welded to the joint portion.

Abstract: A hybrid welding device capable of reducing an influence of by-products such as spatters, plasma, plumes, and fume, and reducing contamination of a laser optical system and welding defects is provided. A laser head includes a laser nozzle that forms an optical path of a laser beam, a first rectifying plate that is arranged on a tip side of the laser nozzle so as not to interfere with the laser beam, a first air knife that injects compressed air along the first rectifying plate, a second rectifying plate that is arranged between the first rectifying plate and the welded portion so as not to interfere with the laser beam, and a second air knife that injects compressed air along the second rectifying plate. The first rectifying plate and the second rectifying plate have a shape elongated in a direction perpendicular to an optical axis of the laser beam and a welding direction. The second rectifying plate has a torch opening through which a tip of a welding torch can be inserted.

Abstract: A tensile load is applied to the test body to increase with time, and an AE wave displacement in the test body is detected (step S1). From the detected AE wave, waveform data are generated for each time section (step S2). For each section, from the waveform data, spectrum data are generated (step S3), a peak of an intensity in the spectrum data is specified, a data part in which an intensity is at least a value of a set percentage of the peak in the spectrum data is extracted as processing target data (step S4), and from the processing target data, the most frequent value of frequency gravity centers is specified (step S5). The most frequent value for each section and a tensile load applied to the test body in each section are output as strength evaluation data for evaluating a tensile strength of the test body (step S6).

Abstract: Provided is a method for predicting and evaluating adhesion of combustion ash in a coal-mixed combustion boiler in which biomass is used as renewable energy, the method comprising: ashing a sample to prepare an ashed test sample, the sample being obtained by mixing the biomass with coal that is main fuel of the coal-mixed combustion boiler, at a predetermined additive ratio; sintering the ashed test sample under a combustion temperature condition of the coal-mixed combustion boiler to generate sintered ash; testing the sintered ash by a rattler tester to obtain a sticking degree from a ratio obtained by dividing a weight of the sintered ash after the test by a weight of the sintered ash before the test; and evaluating in advance an adhesion state of the combustion ash in the coal-mixed combustion boiler on a basis of the sticking degree.

Abstract: Provided is a correlation deriving method including the steps of: generating coal ash by incinerating coal; generating sintered ash by heating the coal ash at a predetermined heating temperature within a range of a combustion temperature of a coal burning boiler; measuring hardness of the sintered ash; measuring an exhaust gas temperature exhibited when coal which is to have the hardness is burnt in the coal burning boiler; and deriving a correlation between the hardness and the exhaust gas temperature.

Abstract: A strength inspection device for evaluating a tensile strength of a test body as a fiber reinforced composite material includes: an AE sensor that detects AE waves generated in the test body by a tensile load in a test period of application of the increasing tensile load to the test body, and generates waveform data of the AE waves; a target wave specifying unit that specifies, as target waves, the AE waves of duration longer than a time threshold, based on the waveform data; an arithmetic unit calculates a frequency center of gravity concerning each target wave; and an evaluation data generation unit generates strength evaluation data of association between the frequency center of gravity concerning each target waves and magnitude of the tensile load applied to the test body at a detection time point of the target wave.

Abstract: A plurality of ultrasonic transducers of the invented probe are separated in a concentric circle pattern, separated in rows that are orthogonal to a reference line L that passes through the center of circles, and positioned line symmetrically with respect to the reference line L. The detection surface of the invented probe has a circular shape having the diameter D, and has a plurality of segments divided into a plurality of arc-shaped portions that are symmetrical with respect to the reference line L. Further a controller which has a plurality of control channels for controlling pairs of the line symmetrical ultrasonic transducers under the same conditions is provided.

Abstract: The present invention is equipped with an AE sensor 12, a load test device 14, a storage device 22, a frequency center of gravity calculation unit 24 and a determination device 26. A loading pattern including, raising, retaining and unloading is repeatedly applied to a test subject 1 by the load test device 14, the maximum load is sequentially increased, and the AE waves 2 detected by the AE sensor 12 are stored with the load by the storage device 22. Next, the frequency center of gravity of the AE waves is obtained from the relationship between the frequency of the AE waves 2 and the intensity thereof by the frequency center of gravity calculation unit 24, and delamination preceding breakage is determined by the determination device 26 when the frequency center of gravity 5 is less than a prescribed first frequency.

Abstract: Conducted are coal-ash generating step for generating coal ash, sintered-ash generating step for heating the coal ash at temperatures within combustion temperature range of coal-fired boiler to generate sintered ash at each heating temperature, sticking-degree calculating step for rotatively separating each sintered ash by ratra tester to calculate sticking degree from weight ratio of each sintered ash after and before the rotary separation of the sintered ash, correlation determining step for burning each coal having corresponding sticking degree calculated to measure exhaust gas temperature and obtain correlation between sticking degrees and exhaust gas temperatures, exhaust-gas-temperature predicting step for predicting exhaust gas temperature from sticking degree of coal to be employed as fuel based on the correlation between the sticking degrees and the exhaust gas temperatures and adhesion predicting step for predicting ash adhesion in the coal-fired boiler based on the exhaust gas temperature predicted

Abstract: A tensile load is applied to the test body to increase with time, and an AE wave displacement in the test body is detected (step S1). From the detected AE wave, waveform data are generated for each time section (step S2). For each section, from the waveform data, spectrum data are generated (step S3), a peak of an intensity in the spectrum data is specified, a data part in which an intensity is at least a value of a set percentage of the peak in the spectrum data is extracted as processing target data (step S4), and from the processing target data, the most frequent value of frequency gravity centers is specified (step S5). The most frequent value for each section and a tensile load applied to the test body in each section are output as strength evaluation data for evaluating a tensile strength of the test body (step S6).

Abstract: Welding quality of a welding section W welded by laser welding is determined by acquiring an image of the welding section W and its surrounding region by means of a high-speed camera 11, analyzing, as parameters, the number of spatters P per unit length and the area of a high-luminance region in the acquired image by means of an analyzer 12, and comparing the analyzed parameters with respective comparison tables created beforehand, to determine the welding quality of the welding section Wa. Information on the welding quality of the welding section W is displayed on a monitor 13. Not only the laser welding quality of the welding section can be determined but also in-process shearing strength prediction as well as in-process fracture mode prediction can be performed, thus enabling quality control matching high-speed and high-precision laser welding.

Abstract: A plurality of ultrasonic transducers of the invented probe are separated in a concentric circle pattern, separated in rows that are orthogonal to a reference line L that passes through the center of circles, and positioned line symmetrically with respect to the reference line L. The detection surface of the invented probe has a circular shape having the diameter D, and has a plurality of segments divided into a plurality of arc-shaped portions that are symmetrical with respect to the reference line L. Further a controller which has a plurality of control channels for controlling pairs of the line symmetrical ultrasonic transducers under the same conditions is provided.

Abstract: An ultrasonic transmitter 3 attached to an inspecting target object 1, an ultrasonic receiver 5 receiving a reflected wave of the ultrasonic wave that has propagated from the ultrasonic transmitter 3 in the inspecting target object, a data processing device 7 acquiring position specifying data for specifying a position of a defect 1a in the inspecting target object 1 on the basis of received data representing a waveform of the reflected wave received by the ultrasonic receiver 5 are provided. The ultrasonic wave generated by the ultrasonic transmitter 3 has been frequency-modulated, and has a waveform composed of components of respective frequencies that are deviated from a resonance frequency of the ultrasonic transmitter 3 and the ultrasonic receiver 5. The data processing device 7 includes a pulse compressing unit 21 performing pulse compression on the received data, and acquires the position specifying data on the basis of the pulse-compressed received data.

Abstract: An L-mode guided wave sensor 10 for inspecting an inspection target by using an L-mode guided wave. The L-mode guided wave sensor 10 is provided with a vibrator 3 which is attached to an inspection target 1, and a coil 5 which is wound around the vibrator 3 and to which an AC voltage is applied. The vibrator 3 is made of a ferromagnetic material.

Abstract: The fuel physical property determination method relating to the first aspect of the present invention includes: a test fuel flame-imaging step of obtaining imaging data by imaging flames formed by supplying a pre-mixed gas containing a test fuel and an oxidant agent, to a test tube in which an internal flow path thereof has a diameter set smaller than a flame-quenching distance at normal temperature; and a physical property determination step of determining a physical property of the test fuel by comparing the imaging data obtained in the test fuel flame-imaging step and imaging data obtained by imaging flames ignited by supplying a pre-mixed gas containing a standard-mixed fuel and an oxidant agent, to the test tube, the standard-mixed fuel having a known physical property.

Abstract: (A) first data for defect amount estimation for the guided wave of a first frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (B) second data for defect amount estimation for the guided wave of a second frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (C) a guided wave of the first frequency is generated, and amplitude of a reflected wave is detected as first amplitude. (D) a guided wave of the second frequency is generated, and amplitude of a reflected wave is detected as second amplitude. (E) on a basis of the first and second data and the first and second amplitude, a defect cross-sectional area and a defect width of the defect part are estimated.

Abstract: A testing method using a guided wave generates a guided wave to propagate through a subject as a testing target in a longitudinal direction of the subject, detects a reflected wave of the guided wave and examines the subject on the basis of the reflected wave. The testing method includes the steps of (A) obtaining data for defect amount estimation beforehand indicating a relationship between a defect amount of the subject and a magnitude of a reflected wave, (B) generating a guided wave so as to propagate through the subject, and detecting a reflected wave of the guided wave, and (C) estimating a defect amount of the subject on the basis of the data for defect amount estimation obtained at (A) and the magnitude of the guided wave detected at (B).

Abstract: An L-mode guided wave sensor 10 for inspecting an inspection target by using an L-mode guided wave. The L-mode guided wave sensor 10 is provided with a vibrator 3 which is attached to an inspection target 1, and a coil 5 which is wound around the vibrator 3 and to which an AC voltage is applied. The vibrator 3 is made of a ferromagnetic material.

Abstract: Provided is a fixing jig including: a base configured to be mounted to a load axis of a fatigue testing device and including an accommodating recess portion for accommodating a portion to be held of a test piece; a pressing member disposed so as to be supported in the accommodating recess portion and configured to come into surface contact with an end surface of the test piece; and an insert nut configured to be threadedly engaged with a male screw portion of the portion to be held of the test piece. The fixing jig further includes a fastening flange including a hole portion for loosely inserting the test piece therethrough and a flange portion configured to come into contact with the insert nut, for holding the test piece in the accommodating recess portion via the insert nut so that the end surface of the test piece is pressed against the pressing member supported by the base.