Disclosed is a laser beam processing device, the main part of which is a coupling device (1) for coupling a focused laser beam (2) into a fluid jet (3) of a defined cross-section. The coupling device (1) comprises a housing (4), in which a fluid nozzle is configured for forming the fluid jet (3). In addition, an outlet opening (6) is provided in the housing, through which the fluid jet (3) exits from the housing (4) and the cross-section of which is larger than the cross-section of the fluid jet (3). A passage chamber is provided between the fluid nozzle (5) and the outlet opening (6) for the fluid jet (3). According to the invention, a throttle bore is provided, which connects the passage chamber (7) to the pressure chamber and is dimensioned in relation to the outlet opening so that, in the region of the passage chamber which is arranged about the fluid nozzle (5), there is a pressure that is smaller than the pressure in the pressure chamber so that an overpressure does not form in the passage chamber with respect to the pressure in the pressure chamber. In addition, a method is disclosed for setting a pressure in the passage chamber (7) in a coupling device of this type, in which the pressure does not exceed the pressure in the pressure chamber.

In a laser processing method, laser lights of fiber lasers or direct diode lasers is irradiated onto an iron-based plate material from a nozzle, a nozzle with a nozzle opening whose opening diameter is preliminarily set according to a thickness of the plate material is selected from plural nozzles whose nozzle openings have different opening diameters from each other, and the plate material is cut while irradiating the laser lights onto the plate material and injecting assist gas from the nozzle opening toward the plate material.

A laser cutting apparatus includes a laser beam irradiation apparatus configured to radiate a laser beam, a pressure wave irradiation part including a plurality of pressure wave sources configured to radiate pressure waves toward a fusing part or a section to be cut by the laser beam, and a jet injection part configured to inject jets toward the fusing part or the section to be cut along respective outer circumferential sides of the pressure waves.

A laser processing machine includes a laser generator, assist gas supply tube, a light part, an imaging part, an acquisition part, and an adjustment part. The assist gas supply tube adjusts pressure of an assist gas and supplies the assist gas which is a gas injected from an irradiation port to an inner nozzle space. The imaging part images a workpiece by detecting a reflected light which is illumination light from the light part reflected by the workpiece through a portion of a laser beam passing space. The acquisition part acquires focal information which is a change amount of an imaging focal position according to the gas pressure in the inner nozzle space or is information for compensating the change amount. The adjustment part adjusts at least one of an imaging focal position and a position of the imaging part based on the focal information acquired by the acquisition part.

A laser cut-and-machined product made from a plated steel plate. A cut face of the plated steel plate is coated with plating-layer-containing metal of a top surface of the plated steel plate that is melted and/or evaporated at the time of laser cutting and machining.

To provide a nozzle for laser processing head capable of reliably drilling a small hole when drilling of the workpiece is performed by using a laser machine. A nozzle includes: a nozzle tip body that irradiates a workpiece with a laser beam; a charge port formed in the nozzle tip body; an exhaust port formed in the nozzle tip body so as to oppose to the charge port; and an elastic member that is provided in a tip end of the nozzle tip body and contacts with the workpiece while elastically extending and contracting in the axial center direction of the nozzle tip body. The nozzle supplies gas to the inside of the nozzle tip body along a gas flow path extending from the charge port to the exhaust port in a form of crossing across the laser beam in the nozzle tip body, to generate a negative pressure in the vicinity of an opening part of a tip end of the nozzle tip body. The elastic member contacts with the workpiece and improves the degree of enclosure of the nozzle tip body by the workpiece. Thereby, higher negative pressure than the negative pressure is generated.

Laser cutting on a plated steel sheet is executed by cutting the plated steel sheet by irradiating the plated steel sheet covered with a plate metal with laser light at a wavelength in a 1 micrometer band; and emitting assist gas onto a cut surface of the plated steel sheet, the cut surface being formed. in the step of cutting, to make the plate metal fused by irradiation of the laser light flow to the cut surface so as to cover the cut surface with the plate metal.

A laser cutting and machining method for plated steel plated, when irradiating a laser beam LB on to the upper surface of a plated steel plate W and laser cutting and machining same: a plating layer-containing metal that has been melted and/or evaporated by the irradiation of the laser beam LB is caused to flow on to a cut surface of the plated steel plate W as a result of assist gas that is jetted towards a laser machining units; and the plating layer-containing metal is coated on the cut surface.

In a laser processing method, laser lights of fiber lasers or direct diode lasers is irradiated onto an iron-based plate material from a nozzle, a nozzle with a nozzle opening whose opening diameter is preliminarily set according to a thickness of the plate material is selected from plural nozzles whose nozzle openings have different opening diameters from each other, and the plate material is cut while irradiating the laser lights onto the plate material and injecting assist gas from the nozzle opening toward the plate material.

A laser welding system for welding a component and reducing defects in the weld by ensuring uniform, laminar gas flow over a process area of the system. The laser welding system comprises a laser for welding the component, a platform for supporting the component, an enclosure surrounding the platform, a first actuatable barrier, a second actuatable barrier, an actuator, and a controller. The enclosure includes a plurality of walls, one of the walls having an inlet and another wall having an outlet. The inlet and outlet each having an opening having a cross-sectional area for letting gas flow through. The first and second barriers are configured to modify the cross-sectional areas of the openings when actuated. The actuator is configured to actuate the barriers, and the controller is configured to direct the actuator to actuate the barriers so that the cross-sectional area of the first opening is larger than the cross-sectional area of the second opening so that a pressure at the inlet is greater than a pressure at the outlet.