Abstract: A laser device for machining a workpiece by using at least two laser beams is provided. The laser device is configured to generate the at least two laser beams. Each of the at least two laser beams has an initial power. The laser device is further configured to focus the at least two laser beams on the workpiece, and vary the initial power of the at least two laser beams with a variation frequency of at least 50 kHz and a variation amplitude of at least 10% of the initial power.

Abstract: A laser device for processing a workpiece is configured to generate and focus at least one laser beam onto the workpiece so that a laser spot is generated on the workpiece. The laser spot has a core region and a ring region. An average laser power density in the core region is higher than an average laser power density in the ring region. The laser device is configured to vary the average laser power density in the core region with a first variation frequency of at least 50 kHz and a first variation amplitude of at least 10% of the average laser power density in the core region, and/or vary the average power density in the ring region with a second variation frequency of at least 50 kHz and a second variation amplitude of at least 10% of the average laser power density in the ring region.

Abstract: A method for laser cladding along a feed direction by a jet nozzle includes directing a first laser beam at a workpiece to produce a first irradiation zone and directing a second laser beam at the workpiece to produce a second irradiation zone. The second irradiation zone is upstream of the first irradiation zone in the feed direction. The method further includes introducing a filler material into the first irradiation zone. The filler material at least partially enters the first laser beam before hitting the workpiece and is at least partially heated as a result. The first laser beam introduces a primary laser energy into the first irradiation zone. The second laser beam introduces a secondary laser energy into the second irradiation zone. The secondary laser energy is greater than the primary laser energy.

Abstract: A method for stripping a rod-shaped conductor using laser radiation is provided. The rod-shaped conductor includes an electrically conductive core and a coating that is at least partially transparent to the laser radiation. The method includes traversing the conductor for a first time with at least one laser beam to at least partially reduce transparency of the coating, and traversing the conductor for a second time with the at least one laser beam to at least partially reduce adhesion of the coating.

Abstract: A method for laser-welding at least two conductor pieces includes providing an elongated first conductor piece having a first end portion and a first end face, and providing an elongated second conductor piece having a second end portion and a second end face. The first end face is arranged adjacent to the second end face. The method further includes producing a first laser spot on the first end face to produce a first weld pool, and producing a second laser spot on the second end face to produce a second weld pool. The first laser spot and the second laser spot are produced simultaneously. The first weld pool and the second weld pool subsequently merge to form a common weld pool.

Abstract: A method for laser deposition welding in a laser system includes actuating a processing unit having a jet nozzle for providing a laser beam and a powder jet so that the powder jet, in interaction with the laser beam, deposits a powder-layer trace onto a workpiece, actuating a workpiece receiving unit, on which the workpiece is arranged, so that a rotational movement moves the workpiece about an axis of rotation, and actuating a translation unit so that a translational movement moves the jet nozzle and/or the workpiece receiving unit in an offset direction orthogonal to the axis of rotation. The rotational movement and the translational movement combine to form an advancing movement such that the powder-layer trace is deposited onto the workpiece along a spiral path. A processing parameter varies as processing of the workpiece progresses so that a powder layer thickness varies along a radial direction of the workpiece.

Abstract: An optical system for a laser system for laser cutting includes a light guide for simultaneously coaxially transporting a first laser beam as a single-mode or quasi-single-mode laser beam and a second laser beam as a multi-mode laser beam, and an optical device arranged in a beam path of the first laser beam downstream of the light guide. The optical device is configured to impose a phase singularity and/or a polarization singularity on the first laser beam for generating an annular intensity distribution of the first laser beam with a central intensity minimum on an optical axis of the optical system.

Abstract: A method for laser soldering includes selecting a copper-containing material as a filler material, supplying the filler material at a butt joint of two components, and melting the filler material in a main process zone by means of laser radiation in an advancement direction. The filler material in the main process zone is melted by means of laser radiation of a wavelength ?H in the blue or green spectral range with 400 nm??H?600 nm.

Abstract: A jet nozzle for laser deposition welding along a feed direction includes a light channel for guiding at least one laser beam that is directed onto a workpiece, and an outer structure that surrounds the light channel at least in sections and extends from a flange portion to a distal region, which is formed by a nozzle mouth and from which the laser beam emerges. The outer structure includes a cooling system, which has a radially inner cooling chamber at least in sections and a radially outer cooling chamber at least in sections, through which a coolant flows.

Abstract: A jet nozzle for laser deposition welding in an advance direction includes a light channel for guiding at least one laser beam to be directed at a workpiece, and a powder unit arranged radially outside the light channel for guiding at least one powder jet to be applied to the workpiece. The powder unit forms a powder portion in a peripheral direction around the light channel. The jet nozzle further includes a process-gas unit arranged radially outside the light channel for guiding a process gas. The process-gas unit forms a process-gas portion in the peripheral direction. The process-gas portion adjoins the powder portion at a nozzle mouth in the peripheral direction.

Abstract: A jet nozzle for laser cladding along a direction of advance includes a light channel for conducting at least one laser beam directed onto a workpiece, and a powder unit located radially outside the light channel for conducting at least one jet of powder to be applied to the workpiece. The powder unit forms a powder section at a mouth of the jet nozzle in a circumferential direction about the light channel. An advance section that is devoid of the powder unit is contiguous thereto in the circumferential direction.

Abstract: A jet nozzle for laser cladding along a direction of advance includes a light channel for conducting at least one laser beam directed onto a workpiece, and a powder unit arranged radially outside the light channel for conducting at least one jet of powder to be applied to the workpiece. A cross-sectional area of the light channel that is orthogonal to a longitudinal direction of the jet nozzle deviates from a circular shape and is oblong in the direction of advance.

Abstract: A jet nozzle for laser cladding along a direction of advance includes a light channel for conducting at least one laser beam directed onto a workpiece, and an outer structure surrounding the light channel at least in sections. The outer structure extends from a flange portion to a distal region that is formed by a mouth of the jet nozzle from which the at least one laser beam exits. The light channel forms an absorption portion for absorbing back-reflected radiation of the at least one laser beam from the workpiece.

Abstract: A jet nozzle is for laser cladding along a direction of advance. The jet nozzle includes a light channel for conducting at least one laser beam directed onto a workpiece; and a powder unit arranged radially outside the light channel for conducting at least one jet of powder which is to be applied to the workpiece with at least a first powder focus. The powder unit forms a powder section at a mouth of the jet nozzle in a circumferential direction around the light channel. The powder section includes a plurality of injector guides, into each of which a powder injector is configured to be inserted. A first injector guide is located substantially opposite a second injector guide in relation to the first powder focus.

Abstract: A method for laser welding two coated workpieces includes positioning an upper workpiece and a lower workpiece on top of each other and passing a first laser beam over the upper and lower workpieces from a side of the upper workpiece so as to at least partially evaporate the respective coating of each of the workpieces on their facing sides along a depletion trace. A second laser beam is passed over the workpieces from the side of the upper workpiece so as to melt a material of the two workpieces within the depletion trace, and thereby weld the workpieces to one another. In the first laser passing, the first laser beam melts the material of the upper workpiece, so that a web of non-melted material of the upper workpiece remaining between the melted material of the upper workpiece and the facing side of the upper workpiece.

Abstract: A method of welding two metal sheets includes providing a first sheet having a first weld surface and a second sheet having a second weld surface. The first sheet has a coating includes an alloy of aluminum and silicon on the first weld surface. The method further includes irradiating the first weld surface and the second weld surface with a laser beam. The laser beam has an inner core and an outer ring with different intensity profiles. The laser beam is moved with a wobbling motion in a feed direction along an imaginary feed line and perpendicular to the imaginary feed line. A path of the laser beam along the imaginary feed line is of a periodic shape. A width of the path perpendicular to the imaginary feed line is greater than a length of a period of the path along the imaginary feed line.

Abstract: A laser system for laser metal deposition includes a laser source for generating a laser beam having a wavelength in a range between 0.4 ?m and 1.5 ?m, and a jet nozzle for directing the laser beam at a workpiece surface and for directing a powder jet including a pulverulent material at the laser beam and at the workpiece surface. The laser beam exiting from the jet nozzle has a reduced intensity in a core region in comparison with a border region. The pulverulent material includes hard-material particles.

Abstract: The present disclosure relates to methods and devices for monitoring a welding process for welding at least one glass workpiece to another workpiece, the workpieces being welded together in a process zone that is exposed to a processing beam, e.g., to a laser beam, such as an ultra-short-pulse laser beam, wherein radiation emitted by the process zone and originating from at least one of the workpieces is detected in a spatially resolved manner.

Abstract: A laser cladding method for producing a coating layer on a surface of a component includes applying a filler material along a helical or spiral-shaped processing trajectory on the surface of the component, and heating the filler material and the component along the processing trajectory by using a laser beam, so that when the filler material strikes the surface, least one coating track is created on the surface having a specified track width. At least two turns of the at least one coating track at least partially overlap with one another along the track width.

Abstract: A laser cladding method includes directing a filler material in a pulverulent form along a respective working trajectory onto each respective surface of two mutually opposite surfaces of a component, and heating the filler material and the component by directing a respective laser beam along the respective working trajectory so that the filler material binds to the component as the filler material meets the respective surface, thereby producing coating layers on the two mutually opposite surfaces at least partly at a same time.