Abstract: A method for welding at least two aluminum-containing components includes subdividing an output laser beam into multiple partial beams directed onto the at least two components, so that multiple laser spots are generated on a surface of the at least two components, and traversing a welding contour with the multiple laser spots on the surface of the components. Centers of at least three laser spots of the multiple laser spots are arranged in a ring formation. The output laser beam is generated by a multifiber, so that each laser spot of the multiple laser spots on the surface of the components has a core portion and a ring portion. The welding contour is traversed at least partially a second time after the welding contour has been traversed a first time.

Abstract: A welding optical unit includes a collimator for collimating a laser beam, a focusing device for focusing the laser beam toward a workpiece, an adjustable beam shaper configured to shape the laser beam. The beam shaper includes a beam subdivision assembly that includes a cylindrical lens pair comprising two cylindrical lenses with diametrically opposite focal lengths and mutually parallel optical planes. The two cylindrical lenses extend with a curve on at least one side with respect to a common refraction direction perpendicular to the optical planes, and extend translationally invariantly with respect to a common non-refraction direction parallel to the optical planes. The refraction direction and the non-refraction direction extend perpendicularly to the optical axis of the welding optical unit. The welding optical unit further includes a spot distance adjusting device configured to displace the two cylindrical lenses relative to one another with respect to the refraction direction.

Abstract: A method for welding at least two aluminum-containing components is provided. The components have an aluminum content of at least 75% by weight. The method includes subdividing an output laser beam into multiple partial beams directed onto the components, so that multiple laser spots are generated on a surface of the components, and traversing a welding contour on the surface of the components with the multiple laser spots. Laser spot centers of at least three laser spots of the multiple laser spots are arranged in a ring formation. The output laser beam is generated by a multifiber, so that each laser spot of the multiple laser spots on the surface of the components has a core portion and a ring portion, with a mean power density in the core portion being higher than a mean power density in the ring portion.

Abstract: A method for welding at least two aluminum-containing components is provided. Each component has a content of at least 75% by weight of aluminium. The method includes subdividing an output laser beam into multiple partial beams directed onto the components such that multiple laser spots are generated on a surface of the components, and traversing a welding contour on the surface of the components with the multiple laser spots. Laser spot centers of at least three laser spots of the multiple laser spots are arranged in a ring formation. The output laser beam is generated by a multifiber such that each laser spot of the multiple laser spots on the surface of the components has a core portion and a ring portion. The welding contour is at least partially traversed by pivoting a first mirror in a controlled manner by a scanner optical unit.

Abstract: Laser beam welding a workpiece includes: generating first and second beam areas on the workpiece by first and second laser beams, respectively. The beam areas are guided in a feed direction relative to the workpiece. Centroids of the beam areas are not coinciding. The first beam area runs ahead of the second beam area. A length of the first beam area, measured transversely to the feed direction, is greater than or equal to that of the second. A surface area of the first beam area is greater than that of the second. A width of the first beam area, measured in the feed direction, is greater than or equal to that of the second. A laser power of the first laser beam is greater than that of the second. The second laser beam is irradiated into a weld pool generated by the first laser beam.

Abstract: The disclosure relates to methods and systems for deep welding a workpiece, a surface of the workpiece being irradiated by a first laser beam and a second laser beam. In a workpiece surface plane (OE) a first beam width B1 of the first laser beam is larger than a second beam width B2 of the second laser beam and in at least the workpiece surface plane (OE) the second laser beam lies inside the first laser beam. The intensity of the first laser beam alone is sufficient to produce a keyhole in the workpiece. The keyhole produced in the workpiece has a width KB in the workpiece surface plane (OE), KB substantially equaling B1, and B2?0.75*KB. The methods and systems provide good seam quality, high penetration depth, and high welding speed.

Abstract: The disclosure relates to methods and systems for deep welding a workpiece, a surface of the workpiece being irradiated by a first laser beam and a second laser beam. In a workpiece surface plane (OE) a first beam width B1 of the first laser beam is larger than a second beam width B2 of the second laser beam and in at least the workpiece surface plane (OE) the second laser beam lies inside the first laser beam. The intensity of the first laser beam alone is sufficient to produce a keyhole in the workpiece. The keyhole produced in the workpiece has a width KB in the workpiece surface plane (OE), KB substantially equaling B1, and B2?0.75*KB. The methods and systems provide good seam quality, high penetration depth, and high welding speed.

Abstract: A laser welding optical apparatus includes: a laser beam source; a collimation optical unit collimating the provided laser beam; a beam splitter splitting the collimated laser beam into partial beams, the beam splitter having a first setting facility, which variably sets the splitting of the collimated laser; and a focusing optical unit focusing the partial beams onto the welding workpiece The laser beam source has a multiclad fiber having a core and ring fiber, and a second setting facility, which variably splits an input laser beam at an end of the multiclad fiber between the core and ring fiber. A second end of the multiclad fiber provides the laser beam for the collimation optical unit. The beam splitter splits the collimated laser beam among two leading and trailing partial beams. The first setting facility sets the energy distribution between the leading and the trailing partial beams.

Abstract: Methods for determining the quality of a weld of a workpiece welded by laser-beam welding, wherein at least a partial region of a molten pool and/or of a surrounding area of the molten pool is observed by means of a measuring system during the laser-beam welding and the quality of the weld of the welded workpiece is determined on the basis of the observation result. At least one characteristic value that correlates with molten pool oscillation of the molten pool is observed during the laser-beam welding and a measure of an amplitude of the molten pool oscillation and/or a measure of a frequency of the molten pool oscillation is determined from the observed time curve of the characteristic value. A probability and/or a frequency for the occurrence of hot cracks at the weld of the workpiece is inferred.

Abstract: Laser beam welding a workpiece includes: generating first and second beam areas on the workpiece by first and second laser beams, respectively. The beam areas are guided in a feed direction relative to the workpiece. Centroids of the beam areas are not coinciding. The first beam area runs ahead of the second beam area. A length of the first beam area, measured transversely to the feed direction, is greater than or equal to that of the second. A surface area of the first beam area is greater than that of the second. A width of the first beam area, measured in the feed direction, is greater than or equal to that of the second. A laser power of the first laser beam is greater than that of the second. The second laser beam is irradiated into a weld pool generated by the first laser beam.

Abstract: The disclosure relates to methods and systems for deep welding a workpiece, a surface of the workpiece being irradiated by a first laser beam and a second laser beam. In a workpiece surface plane (OE) a first beam width B1 of the first laser beam is larger than a second beam width B2 of the second laser beam and in at least the workpiece surface plane (OE) the second laser beam lies inside the first laser beam. The intensity of the first laser beam alone is sufficient to produce a keyhole in the workpiece. The keyhole produced in the workpiece has a width KB in the workpiece surface plane (OE), KB substantially equaling B1, and B2?0.75*KB. The methods and systems provide good seam quality, high penetration depth, and high welding speed.

Abstract: Methods for determining the quality of a weld of a workpiece welded by laser-beam welding, wherein at least a partial region of a molten pool and/or of a surrounding area of the molten pool is observed by means of a measuring system during the laser-beam welding and the quality of the weld of the welded workpiece is determined on the basis of the observation result. At least one characteristic value that correlates with molten pool oscillation of the molten pool is observed during the laser-beam welding and a measure of an amplitude of the molten pool oscillation and/or a measure of a frequency of the molten pool oscillation is determined from the observed time curve of the characteristic value. A probability and/or a frequency for the occurrence of hot cracks at the weld of the workpiece is inferred.

Abstract: In some aspects, a tool cartridge for detachably holding tool parts includes a cartridge base body, a punch holder configured to detachably hold a processing punch, and a die holder configured to detachably hold a processing die. The punch holder and the die holder project from a front side of the cartridge base body and are arranged one above another to form an intervening space. The cartridge base body is defined along a rear side that is opposite from free ends of the punch holder and the die holder by a base body rear wall. The base body rear wall defines, within the intervening space, a wall opening that is open for receiving a third tool part holder. A base-body-side fastening device is provided on the cartridge base body, by which the third tool part holder received in the wall opening is connected to the cartridge base body.

Abstract: In some aspects, a tool cartridge for detachably holding tool parts includes a cartridge base body, a punch holder configured to detachably hold a processing punch, and a die holder configured to detachably hold a processing die. The punch holder and the die holder project from a front side of the cartridge base body and are arranged one above another to form an intervening space. The cartridge base body is defined along a rear side that is opposite from free ends of the punch holder and the die holder by a base body rear wall. The base body rear wall defines, within the intervening space, a wall opening that is open for receiving a third tool part holder. A base-body-side fastening device is provided on the cartridge base body, by which the third tool part holder received in the wall opening is connected to the cartridge base body.