Abstract: A welding laser beam (L1) is radiated along welding loci (C11, C12) set in workpieces (W1, W2), or an inspection laser beam (L5) is radiated along scanning loci (C51, C52) set in a molten pool (Y1) of the workpieces that are molten by radiation of the welding laser beam, a returned light beam (L2) including reflection light from the molten pool, vapor light caused due to melting and evaporation of the workpieces, and thermal radiation light emitted from the molten pool is received, and a welding state of a welded portion of the workpieces is inspected based on an intensity of a returned light beam received in a first region inside the molten pool which is relatively close to a given point and an intensity of a returned light beam received in a second region inside the molten pool which is relatively spaced from the given point.

Abstract: A welding laser beam (L1) is radiated along welding loci (C11, C12) set in workpieces (W1, W2), or an inspection laser beam (L5) is radiated along scanning loci (C51, C52) set in a molten pool (Y1) of the workpieces (W1, W2) that are molten by radiation of the welding laser beam (L1), a returned light beam (L2) including reflection light from the molten pool (Y1) of the workpieces, vapor light caused due to melting and evaporation of the workpieces, and thermal radiation light emitted from the molten pool (Y1) of the workpieces is received, and a welding state of a welded portion of the workpieces is inspected based on an intensity change of the returned light beam (L2) thus received.

Abstract: Welding laser beam is irradiated along welding trajectories set in works, or inspection laser beam is irradiated along scanning trajectories set in a molten pool in the works which has been melted by the welding laser beam. Return light including reflected light from the molten pool in the work, evaporation luminescence generated by melting/evaporating of the work and thermal radiation light radiated from the molten pool in the work is received. A fundamental frequency is detected by conducting Fourier transform on the intensity of the received return light and a welding condition of the welding portion in the work is inspected based on an amplitude under the fundamental frequency and an amplitude under a frequency that is twice as high as the fundamental frequency.

Abstract: Provided is a laser welding apparatus that performs welding by irradiating a laser beam onto a welded part, the laser welding apparatus including: a shielding gas supply unit that supplies a shielding gas to the welded part; a gas feed rate controlling unit that controls a flow rate of the shielding gas; a light intensity measurement unit that measures a light intensity of plasma light emitted from the welded part; and a rate-of-change calculation unit that calculates a rate of change of the light intensity measured by the light intensity measurement unit. The gas feed rate controlling unit controls, according to the calculated rate of change of the light intensity, the flow rate of the shielding gas supplied to the welded part.

Abstract: A metal paste for joining includes aggregates of metal nanoparticles and a solvent, and an average particle size of the aggregates is 1 ?m or more.

Abstract: A welding portion inspection method includes: irradiating welding laser beam along welding trajectories set in works plural times or irradiating inspection laser beam along scanning trajectories set in a molten pool of the works which is melted by the welding laser beam plural times; receiving return light including reflected light from the molten pool of the work, evaporation luminescence generated due to evaporating of the work and thermal radiation light radiated from the molten pool of the work; extracting short wavelength component containing evaporation luminescence and long wavelength component containing thermal radiation light from the return light and inspecting the welding condition of the welding portion of the work based on a ratio between an intensity of the short wavelength component and an intensity of the long wavelength component.

Abstract: A welding laser beam (L1) is radiated along welding loci (C11, C12) set in workpieces (W1, W2), or an inspection laser beam (L5) is radiated along scanning loci (C51, C52) set in a molten pool (Y1) of the workpieces (W1, W2) that are molten by radiation of the welding laser beam (L1), a returned light beam (L2) including reflection light from the molten pool (Y1) of the workpieces, vapor light caused due to melting and evaporation of the workpieces, and thermal radiation light emitted from the molten pool (Y1) of the workpieces is received, and a welding state of a welded portion of the workpieces is inspected based on an intensity change of the returned light beam (L2) thus received.

Abstract: A welding laser beam (L1) is radiated along welding loci (C11, C12) set in workpieces (W1, W2), or an inspection laser beam (L5) is radiated along scanning loci (C51, C52) set in a molten pool (Y1) of the workpieces that are molten by radiation of the welding laser beam, a returned light beam (L2) including reflection light from the molten pool, vapor light caused due to melting and evaporation of the workpieces, and thermal radiation light emitted from the molten pool is received, and a welding state of a welded portion of the workpieces is inspected based on an intensity of a returned light beam received in a first region inside the molten pool which is relatively close to a given point and an intensity of a returned light beam received in a second region inside the molten pool which is relatively spaced from the given point.

Abstract: Welding laser beam is irradiated along welding trajectories set in works, or inspection laser beam is irradiated along scanning trajectories set in a molten pool in the works which has been melted by the welding laser beam. Return light including reflected light from the molten pool in the work, evaporation luminescence generated by melting/evaporating of the work and thermal radiation light radiated from the molten pool in the work is received. A fundamental frequency is detected by conducting Fourier transform on the intensity of the received return light and a welding condition of the welding portion in the work is inspected based on an amplitude under the fundamental frequency and an amplitude under a frequency that is twice as high as the fundamental frequency.

Abstract: The invention is directed to an electronic component mounting apparatus which is applicable to a case in which component feeding devices need not be provided on both sides of a carrying device respectively for reasons of types of electronic components or a setting space and increases an operating rate of a beam to enhance production efficiency. An electronic component mounting apparatus has a carrying device carrying a printed board, a component feeding device supplying electronic components, a pair of beams movable in one direction by drive sources, and mounting heads each having suction nozzles and movable along the beams by drive sources.

Abstract: The invention is directed to an electronic component mounting apparatus which is applicable to a case in which component feeding devices need not be provided on both sides of a carrying device respectively for reasons of types of electronic components or a setting space and increases an operating rate of a beam to enhance production efficiency. An electronic component mounting apparatus has a carrying device carrying a printed board, a component feeding device supplying electronic components, a pair of beams movable in one direction by drive sources, and mounting heads each having suction nozzles and movable along the beams by drive sources.

Abstract: The invention is directed to an electronic component mounting apparatus which is applicable to a case in which component feeding devices need not be provided on both sides of a carrying device respectively for reasons of types of electronic components or a setting space and increases an operating rate of a beam to enhance production efficiency. An electronic component mounting apparatus has a carrying device carrying a printed board, a component feeding device supplying electronic components, a pair of beams movable in one direction by drive sources, and mounting heads each having suction nozzles and movable along the beams by drive sources.

Abstract: The invention is directed to an electronic component mounting apparatus which is applicable to a case in which component feeding devices need not be provided on both sides of a carrying device respectively for reasons of types of electronic components or a setting space and increases an operating rate of a beam to enhance production efficiency. An electronic component mounting apparatus has a carrying device carrying a printed board, a component feeding device supplying electronic components, a pair of beams movable in one direction by drive sources, and mounting heads each having suction nozzles and movable along the beams by drive sources.

Abstract: The present invention is directed to a method of producing calcium cellulose glycolate. Basically, the method comprises converting sodium cellulose glycolate to calcium cellulose glycolate in a heterogeneous reaction system under particular reaction conditions.