Abstract: A laser cladding apparatus is capable of easily collecting metal powder and improving operational efficiency. The laser cladding apparatus clads valve seats of exhaust ports formed in a cylinder head by irradiating the valve seats with a laser beam while supplying metal powder to the valve seats. The laser cladding apparatus includes: a duct connected to the exhaust ports; and a dust collector that sucks a surplus of the metal powder generated at the valve seats. The duct has a vertical part formed in a straight tube and arranged so that the axis thereof is substantially vertical, and a branched part branched from the vertical part and arranged so that the branched direction is upward relative to the horizontal direction. The dust collector is connected to the tip of the branched part.

Abstract: A laser cladding apparatus is capable of easily collecting metal powder and improving operational efficiency. The laser cladding apparatus dads valve seats of exhaust ports formed in a cylinder head by irradiating the valve seats with a laser beam while supplying metal powder to the valve seats. The laser cladding apparatus includes: a duct connected to the exhaust ports; and a dust collector that sucks a surplus of the metal powder generated at the valve seats. The duct has a vertical part formed in a straight tube and arranged so that the axis thereof is substantially vertical, and a branched part branched from the vertical part and arranged so that the branched direction is upward relative to the horizontal direction. The dust collector is connected to the tip of the branched part.

Abstract: Provided are a method for managing the quality of laser cladding processing and a laser cladding processing device by which the quality of a cladding layer formed on a processing portion of a workpiece can be managed by a simple configuration and reliably while suppressing manufacturing cost. The quality of the cladding layer is managed based on the intensity of infrared light S generated when metal powder P discharged toward laser beam R is melted in the air by the laser beam R.

Abstract: There is provided a method for manufacturing a cast iron member in which the production of gas defects such as blowholes or pinholes in a clad layer formed on the surface of a cast iron material can be reduced, and the generation of bead cracks in the clad layer can be restrained. In the method for manufacturing a cast iron member, including a step of forming the clad layer by melting a material for cladding by means of irradiation of a laser emitted from a laser irradiation device and by depositing the melted material on the surface of a part of the cast iron material, the step of forming the clad layer is performed by using a material the main ingredient of which is a copper element as the material for cladding so that when the clad layer is formed, a hardened layer having a thickness of 0.01 to 2.0 mm is formed on the surface of the cast iron material.

Abstract: An optical fiber laser, according to the present invention, has an optical fiber including a core to which a rare earth element is added and a clad disposed around the core, and also has an excitation light source for emitting excitation light incident on a side of the optical fiber. The optical fiber has a corrugated shape on the outer circumference of the clad along the longitudinal direction thereof; and the optical fiber is wound in a spiral form and is bundled in such a way that adjacent sides of the clad are brought into contact with one another.

Abstract: The present invention provides an optical fiber, for use in a fiber laser, from which a high-quality single-mode laser beam with high optical power is obtained and also provides a fiber laser that uses the optical fiber. The novel optical fiber, which includes a core to which a rare earth element is doped and a cladding formed around the core, amplifies excitation light to oscillate a laser beam. A mode filter is formed at a predetermined position in the longitudinal direction of the optical fiber.

Abstract: There is provided a method for manufacturing a cast iron member in which the production of gas defects such as blowholes or pinholes in a clad layer formed on the surface of a cast iron material can be reduced, and the generation of bead cracks in the clad layer can be restrained. In the method for manufacturing a cast iron member, including a step of forming the clad layer by melting a material for cladding by means of irradiation of a laser emitted from a laser irradiation device and by depositing the melted material on the surface of a part of the cast iron material, the step of forming the clad layer is performed by using a material the main ingredient of which is a copper element as the material for cladding so that when the clad layer is formed, a hardened layer having a thickness of 0.01 to 2.0 mm is formed on the surface of the cast iron material.

Abstract: An optical fiber laser, according to the present invention, has an optical fiber including a core to which a rare earth element is added and a clad disposed around the core, and also has an excitation light source for emitting excitation light incident on a side of the optical fiber. The optical fiber has a corrugated shape on the outer circumference of the clad along the longitudinal direction thereof; and the optical fiber is wound in a spiral form and is bundled in such a way that adjacent sides of the clad are brought into contact with one another.

Abstract: A plurality of light emitting elements 11 are arranged in parallel with a constant pitch to provide a semiconductor laser bar 10. An optical waveguide 20 has a core part 21 for guiding a light emitted from each of the light emitting elements 11 and a cladding part 22 formed around the core part 21. An optical fiber 30 has a core 31 and a cladding 32 formed around the core 31 for confining the light to the core 31. The optical waveguide is bonded to a side surface of the optical fiber 30, and the light emitted from the semiconductor laser bar 10 is inputted to a side surface of the core 31 of the optical fiber 30 via the core part 21 of the optical waveguide 20.