An additive manufacturing system is disclosed that heats a feedstock and a workpiece in preparation for depositing and tamping the feedstock onto the workpiece. The system comprises a first laser/optical instrument pair for precisely heating the feedstock and a second laser/optical instrument pair for precisely heating the workpiece. The laser beam from each laser is shaped into an ellipse and each beam is rotated around an angle of rotation to ensure that the feedstock and the workpiece are properly heated. The system employs feedforward, a variety of sensors, and feedback to adjust the angle of rotation of each laser beam.

An additive manufacturing system is disclosed that heats a feedstock and a workpiece in preparation for depositing and tamping the feedstock onto the workpiece. The system comprises a first laser/optical instrument pair for precisely heating the feedstock and a second laser/optical instrument pair for precisely heating the workpiece. The laser beam from each laser is shaped into an ellipse and each beam is rotated around an angle of rotation to ensure that the feedstock and the workpiece are properly heated. The system employs feedforward, a variety of sensors, and feedback to adjust the angle of rotation of each laser beam.

There is provided an additive manufacturing device including a control device of controlling a relative posture of a heat retaining light beam irradiation device to a melting light beam irradiation device, in a state where a heat retaining light irradiation range of a heat retaining light beam larger than a melting light irradiation range of a melting light beam is overlapped with the melting light irradiation range, and such that a size of the heat retaining light irradiation range is changeable with respect to a size of the melting light irradiation range.

A method for fusion welding of one or more steel sheets (1, 2) made of press-hardened steel, preferably manganese-boron steel is disclosed. At least one of the steel sheets has a metallic coating (4) which contains aluminum, and the fusion welding is performed while filler material (11) is being fed into the molten bath (9). In order to improve the hardenability of the weld seam (14), irrespective of whether the steel sheets to be welded together are steel sheets of the same or different material grades and/or steel sheets of different sheet thicknesses, a single laser focal spot (16) with different energy distribution is generated on the molten bath by means of one or more optical elements such that the laser focal spot (16) has a smaller laser focal spot area (16.1) and a larger laser focal spot area (16.2).

A laser processing apparatus has a laser beam applying unit for applying a laser beam to a workpiece held on a chuck table. The laser beam applying unit includes an elliptical spot forming member for changing the spot shape of a pulsed laser beam into an elliptical shape and making the major axis of the elliptical beam spot parallel to a feeding direction, a diffractive optical element for branching the pulsed laser beam having the elliptical beam spot obtained by the elliptical spot forming member, into a plurality of pulsed laser beams each having an elliptical beam spot whose major axis extends in the feeding direction, and a condensing lens for condensing each of the pulsed laser beams branched by the diffractive optical element to the workpiece in such a manner that the major axes of the elliptical beam spots of the pulsed laser beams branched are partially overlapped.

A method for processing a transparent workpiece includes generating a beam of radiation and forming a defect in or on an object. The beam is a quasi-non-diffracting beam and has a focal volume. Forming the defect includes directing the beam onto the object and positioning the focal volume partially or fully within the object. Generating the beam includes partially blocking the beam upstream of the focal volume to adjust an axial symmetry of the freeform energy distribution with respect to an optical axis of the beam using an adjustable blocking element and/or spatially modulating a phase of the beam upstream of the focal volume to adjust a geometry of the freeform energy distribution using a phase mask. The freeform energy distribution has energy sufficient to induce multi-photon absorption in a region of the object that is co-located with the focal volume. The induced multi-photon absorption produces the defect.

A method for separating an ultrathin glass using ultrashort laser pulses of an ultrashort pulse laser includes focusing the ultrashort laser pulses into the ultrathin glass such that a resulting focal zone is elongated in a beam direction and extends over an entire thickness of the ultrathin glass. The ultrashort laser pulses have a non-radially symmetric beam cross section perpendicular to a beam propagation direction. The method further includes introducing material modifications into the ultrathin glass along a separating line using the ultrashort laser pulses focused into the ultrathin glass, and separating the ultrathin glass along the separating line.

A method for dithering can include receiving, at a computer numerically controlled machine comprising a laser, a motion plan corresponding to a first image. The output of the laser can be dithered, in accordance with the motion plan, to effect a change in a material within an interior space of the computer numerically controlled machine. The change can substantially reproduce at least a portion of the first image on the material. The dithering can include providing laser energy to the material at a native resolution based at least on a spot size of the laser. The spot size can be determined based at least on one or more parameters of the computer numerically controlled machine and/or one or more properties of the material. The laser energy can be delivered at locations separated by a distance no less than the spot size.

A laser processing device for generating a plurality of grooves in a surface comprises an optical diffraction arrangement adapted to receive a laser radiation and to generate an output radiation hereupon, the output radiation having a plurality of intensity maxima. An actuator arrangement is provided for generating a relative movement between the output radiation and the surface, wherein each intensity maximum generates a groove of the plurality of grooves.

Provided is a method of manufacturing a joined member by joining a first metal member and a second metal member, the method including: melting an end portion on a joining side of the first metal member, while the first metal member is disposed adjacent to at least a portion of the second metal member, by irradiating the heat source while scanning, the heat source irradiated to the end portion on the joining side of the first metal member has a central portion and a peripheral portion located at a periphery of the central portion and having energy intensity lower than that of the central portion, and in the peripheral portion, a length in a scanning direction of the heat source is longer than a length in a direction perpendicular or substantially perpendicular to the scanning direction of the heat source.