Abstract: A laser processing method is for scanning over a first member in a first affection while irradiating the first member with a laser beam emitted from an oscillator, and joining the first member and a second member adjacent to the first member by a molten portion. The laser processing method includes: in each of a first measurement region and a second measurement region different from the first measurement region, measuring an intensity of a welding light including a heat radiation light radiated from the first member or the second member by irradiation with the laser beam, a plasma light, or a reflected light; and evaluating a processing state based on the intensity of the welding light measured in each of the first measurement region and the second measurement region, the first measurement region and the second measurement region being aligned in a second direction intersecting the first direction.

Abstract: Disclosed is a battery including: a battery can including a cylinder portion including an opening edge portion at one end portion thereof and a bottom portion closing the other end portion of the cylinder portion; an electrode body housed in the cylinder portion; and a sealing member fixed to the cylinder portion to seal an opening of an opening edge portion. The sealing member includes a lid portion covering the opening of the opening edge portion. A first engagement portion is formed in the end portion of the cylinder portion on the opening edge portion side, and a second engagement portion is formed in an end portion of the lid portion on an outer circumferential side. A first surface of the first engagement portion and a second surface of the second engagement portion are bonded, with the first surface and the second surface overlapping each other.

Abstract: A determination program is executed by a processing circuit of a monitoring unit that determines a processed state when processing is performed by irradiating a workpiece with laser light. The determination program includes a control program that is not changeable by a user, and a determination algorithm that is selectively implementable with the control program.

Abstract: A laser welding quality inspection method of a welded portion between a joining object and a joined object, when the joining object and the joined object are welded by being irradiated with a laser beam, the method includes: acquiring first data indicating a signal intensity of thermal radiation light radiated from the welded portion during the welding; acquiring second data indicating a signal intensity of plasma light radiated from the welded portion during the welding; and determining whether or not the welded portion includes an abnormality based on a comparison between the signal intensity of the thermal radiation light and the signal intensity of the plasma light which are acquired.

Abstract: A detection method of the present disclosure is a method for detecting a welding state executed by a processor, the method including acquiring a first signal intensity indicating an intensity of thermal radiation light generated from a portion irradiated with laser light and a second signal intensity indicating an intensity of reflected light reflected from the portion irradiated with the laser light, and detecting a welding state of the portion irradiated with the laser light based on the first signal intensity and the second signal intensity, in which the detecting the welding state determines whether or not the first signal intensity is less than or equal to a first reference signal intensity of thermal radiation light and the second signal intensity is greater than a second reference signal intensity of reflected light.

Abstract: An inspection method includes steps of: acquiring a signal generated by detecting, with an optical sensor, at least one of components of heat radiation, visible light, and reflected light generated by irradiation to a workpiece with a laser beam, and indicating a change in the component in a period corresponding to a machining time for each workpiece; calculating a feature amount indicating a feature of the signal in a predetermined period of the period; determining surface roughness of the workpiece by inputting the calculated feature amount to a determination model that determines surface roughness indicating a surface property of a surface of the workpiece irradiated with the laser beam; and outputting a predicted value of the calculated surface roughness as an inspection result.

Abstract: A laser processing apparatus according to the present disclosure includes: an oscillator that oscillates a laser beam; an irradiation optical system that guides the laser beam to a member to be processed; a measurement optical system that guides, from a measurement region, processing light including any one of thermal radiation light, plasma light, and reflected light emitted from the member by irradiation with the laser beam; a sensor that measures intensity of the processing light guided by the measurement optical system; a moving device that moves an irradiation spot by the laser beam relative to the member from a start point along a scanning path; an adjustment device that shifts a position of the measurement region with respect to a position of the irradiation spot; and a control unit that controls the adjustment device such that a center of the measurement region is located closer to a start point side than a center of the irradiation spot along the scanning path.

Abstract: A laser welding quality inspection method of a welded portion between a joining object and a joined object, when the joining object and the joined object are welded by being irradiated with a laser beam, the method includes: acquiring first data indicating a signal intensity of thermal radiation light radiated from the welded portion during the welding; acquiring second data indicating a signal intensity of plasma light radiated from the welded portion during the welding; and determining whether or not the welded portion includes an abnormality based on a comparison between the signal intensity of the thermal radiation light and the signal intensity of the plasma light which are acquired.

Abstract: The present disclosure includes a laser welding method in which a joint surface between a plurality of workpiece members is welded by radiating laser beam LB, and a locus of laser beam LB is controlled so as to perform wobbling scanning Sw by a combination of scanning motion Sa moving along first direction x parallel to the joint surface and swing motion Sb including first swing component Bx along first direction x and second swing component By along second direction y perpendicular to first direction x, the method including a defect determination step of determining occurrence of a welding defect; and an output control step of increasing or decreasing an output of laser beam LB when laser beam LB is radiated again toward the welding defect in a case where the welding defect occurs.

Abstract: A laser welding monitoring apparatus includes an acquisition interface that acquires a signal corresponding to measurement light measured by irradiating a workpiece with laser light, an arithmetic circuit that determines the state of processing based on the acquired signal, and a storage device that stores in advance variation tendency information corresponding to a tendency of intensity of the measurement light to vary depending on a position of a processing point in a region scannable with the laser light by using an optical system including a galvanometer mirror and a scan lens on the workpiece.

Abstract: A laser machining device according to one aspect of the present disclosure includes: a welding device that irradiates a workpiece with laser irradiation light to perform welding; and a welding light measurement device including an imaging optical system, a first photodetector, and a second photodetector, the welding light measurement device receiving and measuring welding light emitted from the workpiece during laser welding. The welding light includes first light in a first wavelength region and second light in a second wavelength region, and the imaging optical system includes a wavelength selection mask, and forms an image of a light beam of the first light transmitted through the wavelength selection mask on the first photodetector and forms an image of a light beam of the second light transmitted through the wavelength selection mask on the second photodetector.

Abstract: A determination method of a machining condition includes detecting, by using an optical sensor, at least one component of heat radiation, visible light, and reflected light generated at a welded portion provided on a surface of a workpiece by emission of a laser beam on the workpiece, acquiring a signal indicating a change in the at least one component in a time section from a start of welding to an end of welding of the workpiece, calculating a feature quantity based on a signal intensity of the signal in a predetermined section in the time section, determining, as the machining condition, presence or absence of a gap generated between superposed surfaces of the workpiece in an irradiation direction of the laser beam by inputting the calculated feature quantity to a determination model for determining the machining condition, and outputting the determined presence or absence of the gap as a determination result.

Abstract: Provided is a laser processing method including overlapping a plurality of plate-shaped members that include a first plate-shaped member disposed on one end side of an overlapping direction and a second plate-shaped member disposed on the other end side of the overlapping direction; branching a laser beam into a first branched laser beam and a second branched laser beam; irradiating the first plate-shaped member with the first branched laser beam and the second branched laser beam in a state where the first branched laser beam and the second branched laser beam are emitted in parallel; forming line-shaped melting portions on the first plate-shaped member by moving the branched laser beams in a direction intersecting a direction in which the branched laser beams are aligned; and joining overlapped plate-shaped members in a state where the melting portion formed by using the first branched laser beam and the melting portion formed by using the second branched laser beam are connected to each other in the second

Abstract: An evaluation method for evaluating laser machining in which irradiation region of a laser beam is moved relative to object to perform machining of object, includes a measurement step and an evaluation step. In the measurement step, a change in an intensity of light according to a movement of measurement region is measured by moving measurement region for measuring the intensity of light, relative to object. In the evaluation step, an evaluation of the laser machining is performed based on the change in the intensity of light according to the movement of measurement region. In the measurement step, measurement region is moved relative to object so that movement path of measurement region has a plurality of intersections with movement path of irradiation region.

Abstract: A laser welding quality inspection method of a welded portion between a joining object and a joined object, when the joining object and the joined object are welded by being irradiated with a laser beam, the method includes: acquiring first data indicating a signal intensity of thermal radiation light radiated from the welded portion during the welding; acquiring second data indicating a signal intensity of plasma light radiated from the welded portion during the welding; and determining whether or not the welded portion includes an abnormality based on a comparison between the signal intensity of the thermal radiation light and the signal intensity of the plasma light which are acquired.

Abstract: A laser welding quality inspection method of a welded portion between a joining object and a joined object, when the joining object and the joined object are welded by being irradiated with a laser beam, the method includes: acquiring first data indicating a signal intensity of thermal radiation light radiated from the welded portion during the welding; acquiring second data indicating a signal intensity of plasma light radiated from the welded portion during the welding; and determining whether or not the welded portion includes an abnormality based on a comparison between the signal intensity of the thermal radiation light and the signal intensity of the plasma light which are acquired.

Abstract: An estimation model generation device is a device that generates an estimation model for estimating a processing state of laser processing. First thermal radiation, first visible light, first reflected light, and first laser light are observed from a workpiece during laser processing by a first device, and the device includes an information acquiring section that acquires first waveform data including a first waveform and a second waveform for at least two of the first thermal radiation, the first visible light, the first reflected light, and the first laser light, an estimation model generating section that performs machine learning by using teacher data having the first waveform data as an explanatory variable and the processing state as a target variable in association with each other to generate a first estimation model for estimating the processing state by the first device, and a storage that stores the first estimation model.

Abstract: A determination method for determining a processing state includes detecting, using an optical sensor, at least one of heat radiation light, visible light, and reflected light generated at a welded portion formed at a surface of a workpiece by emission of a laser beam on the workpiece, obtaining a signal indicating a change in at least one of heat radiation light, visible light, and reflected light in a time section corresponding to a welding time of each workpiece, calculating a feature quantity including a gradient of a straight line approximating a signal waveform of the signal in a predetermined section in the time section, determining, as the processing state, a shift including farness and closeness of a focal position of the laser beam in an emission direction of the laser beam by inputting the calculated feature quantity to a determination model that determines the processing state.

Abstract: A determination method for determining a processing state includes detecting, using an optical sensor, at least one of heat radiation light, visible light, and reflected light generated at a welded portion formed at a surface of a workpiece by emission of a laser beam on the workpiece, obtaining, from the optical sensor, a signal indicating a change in one of heat radiation, visible light, and reflected light in a time section corresponding to a welding time of each workpiece, determining, as the processing state, the position and number of molten shape abnormality in a welded region having a molten length and a molten width by inputting a feature quantity to a determination model that determines the processing state, the feature quantity including signal intensity of the signal, the molten shape abnormality occurring when a foreign substance exists at an overlapping surface of the workpiece, and outputting a determination result.

Abstract: A laser processing method for scanning over a first member in a first direction while irradiating the first member with a laser beam emitted from an oscillator, and joining the first member and a second member adjacent to the first member by a molten portion, the laser processing method including the steps of: in each of a first measurement region and a second measurement region different from the first measurement region, measuring an intensity of a welding light including any one of a heat radiation light radiated from at least one of the first member and the second member by irradiation with the laser beam, a plasma light, and a reflected light; and evaluating a processing state based on the intensity of the welding light measured in each of the first measurement region and the second measurement region, in which the first measurement region and the second measurement region are aligned in a second direction intersecting the first direction.