Abstract: Detection of defects during a machining process includes: moving a laser beam along a predefined path over multiple workpieces to be machined so as to generate a weld seam or a cutting gap in the workpieces; detecting, in a two-dimensional spatially resolved detector field of a detector, radiation emitted and/or reflected by the multiple workpieces; selecting at least one detection field section in the detection field of the detector based on laser beam control data defining movement of the laser beam along the predefined path or based on a previously determined actual-position data of the laser beam along the predefined path, wherein each detection field section comprises a region encompassing less than the entire detection field; evaluating the radiation detected in the selected detection field section; and determining whether a defect exists at the weld seam or the cutting gap based on the evaluated radiation.

Abstract: A method for detecting defect in a weld seam during laser welding. The method includes performing a two-dimensionally locally resolved detection of radiation that is emitted by a solidified molten mass that is adjacent to a liquid melting bath. The method also includes determining at least one characteristic value for heat dissipation in the solidified molten mass by evaluating the detected radiation along at least one profile-section of the solidified molten mass, and detecting a defect in the weld seam by comparing the at least one characteristic value with at least one reference value.

Abstract: A method for monitoring a processing region of a workpiece on which laser processing is being carried out, in which method the radiation emitted by the processing region is detected by a detector system in a space-resolved manner, wherein the radiation of the processing region is detected for each elemental area of the processing region imaged onto the detector system at least two wavelengths simultaneously. Accurate process monitoring may thereby be carried out.

Abstract: This disclosure relates to verifying a seam quality during a laser welding process. In certain aspects, a method includes detecting, in a spatially resolved manner, a first amount of radiation emerging from a workpiece in a first wavelength range, determining a first geometric parameter of a seam characteristic based on the first amount of radiation detected in the first wavelength range, detecting, in a spatially resolved manner, a second amount of radiation emerging from the workpiece in a second wavelength range, the second wavelength range being different than the first wavelength range, determining a second geometric parameter of the seam characteristic based on the second amount of radiation detected in the second wavelength range, comparing the first and second geometric parameters to respective reference values or to respective tolerance intervals to provide respective comparison results, and logically combining the respective comparison results to verify the seam quality.

Abstract: A method for detecting defect in a weld seam during laser welding. The method includes performing a two-dimensionally locally resolved detection of radiation that is emitted by a solidified molten mass that is adjacent to a liquid melting bath. The method also includes determining at least one characteristic value for heat dissipation in the solidified molten mass by evaluating the detected radiation along at least one profile-section of the solidified molten mass, and detecting a defect in the weld seam by comparing the at least one characteristic value with at least one reference value.

Abstract: A method for detecting defect in a weld seam during laser welding. The method includes performing a two-dimensionally locally resolved detection of radiation that is emitted by a solidified molten mass that is adjacent to a liquid melting bath. The method also includes determining at least one characteristic value for heat dissipation in the solidified molten mass by evaluating the detected radiation along at least one profile-section of the solidified molten mass, and detecting a defect in the weld seam by comparing the at least one characteristic value with at least one reference value.

Abstract: Detection of defects during a machining process includes: moving a laser beam along a predefined path over multiple workpieces to be machined so as to generate a weld seam or a cutting gap in the workpieces; detecting, in a two-dimensional spatially resolved detector field of a detector, radiation emitted and/or reflected by the multiple workpieces; selecting at least one detection field section in the detection field of the detector based on laser beam control data defining movement of the laser beam along the predefined path or based on a previously determined actual-position data of the laser beam along the predefined path, wherein each detection field section comprises a region encompassing less than the entire detection field; evaluating the radiation detected in in the selected detection field section; and determining whether a defect exists at the weld seam or the cutting gap based on the evaluated radiation.

Abstract: A course of a position of a positioning device is determined as a laser beam welds a workpiece at a focus area of the laser beam. The positioning device is configured to position the focus area of a laser beam on a workpiece such that a joint is formed on the workpiece. A course of the joint on the workpiece from the determined course of the position of the positioning device is estimated, and a deviation between the determined course of the position of the positioning device and the estimated course of the joint on the workpiece is calculated. The deviation represents a parameter related to the precision of the seam position control.

Abstract: This disclosure relates to verifying a seam quality during a laser welding process. In certain aspects, a method includes detecting, in a spatially resolved manner, a first amount of radiation emerging from a workpiece in a first wavelength range, determining a first geometric parameter of a seam characteristic based on the first amount of radiation detected in the first wavelength range, detecting, in a spatially resolved manner, a second amount of radiation emerging from the workpiece in a second wavelength range, the second wavelength range being different than the first wavelength range, determining a second geometric parameter of the seam characteristic based on the second amount of radiation detected in the second wavelength range, comparing the first and second geometric parameters to respective reference values or to respective tolerance intervals to provide respective comparison results, and logically combining the respective comparison results to verify the seam quality.

Abstract: A mirror arrangement for a laser processing system includes a mirror configured to deflect laser radiation incident on the mirror arrangement onto a workpiece. The mirror arrangement includes first, second, and third mirror regions. A surface of the third mirror region is parallel to or recessed from a direction of propagation of the laser radiation incident on the mirror arrangement such that the third mirror region forms a shadow zone.

Abstract: The invention relates to a method for monitoring a processing region of a workpiece (10) on which laser processing is being carried out, in which method the radiation emitted by the processing region (11) is detected by a detector system (22) in a space-resolved manner, wherein the radiation of the processing region (11) is detected for each elemental area of the processing region (11) imaged onto the detector system at least two wavelengths simultaneously. Accurate process monitoring may thereby be carried out.

Abstract: A method for detecting defect in a weld seam during laser welding. The method includes performing a two-dimensionally locally resolved detection of radiation that is emitted by a solidified molten mass that is adjacent to a liquid melting bath. The method also includes determining at least one characteristic value for heat dissipation in the solidified molten mass by evaluating the detected radiation along at least one profile-section of the solidified molten mass, and detecting a defect in the weld seam by comparing the at least one characteristic value with at least one reference value.

Abstract: A first position of a joint site on a workpiece is detected with a sensor device. The first position is in a first measurement zone in front of a laser beam incident on the workpiece. The second position is in a second measurement zone at the position of the laser beam, and the third position is in a third measurement zone behind the position of the laser beam. One or more of a second position and a third position of the joint site is detected. The position of the laser beam incident on the workpiece is detected. The first, and one or more of the second and third positions are compared to the position of the laser beam, and, based on the comparison, one or more of a laser machining head configured to direct the laser beam onto the workpiece and the sensor device are adjusted relative to the workpiece.

Abstract: A course of a position of a positioning device is determined as a laser beam welds a workpiece at a focus area of the laser beam. The positioning device is configured to position the focus area of a laser beam on a workpiece such that a joint is formed on the workpiece. A course of the joint on the workpiece from the determined course of the position of the positioning device is estimated, and a deviation between the determined course of the position of the positioning device and the estimated course of the joint on the workpiece is calculated. The deviation represents a parameter related to the precision of the seam position control.

Abstract: A mirror arrangement for a laser processing system includes a mirror configured to deflect laser radiation incident on the mirror arrangement onto a workpiece. The mirror arrangement includes first, second, and third mirror regions. A surface of the third mirror region is parallel to or recessed from a direction of propagation of the laser radiation incident on the mirror arrangement such that the third mirror region forms a shadow zone.

Abstract: A metal sheet-receiving system for receiving parts and feeding a metal sheet-folding machine, particularly a folding press comprising at least one manipulator for seizing and moving metal sheet parts with a gripper head fitted with gripping means; an electronic controlling device for controlling the movements of the manipulator; as well as a measuring system for determining the position of the metal sheet parts. The measuring system is formed by an optoelectronic measuring device, particularly an image acquisition means, and a transillumination platform.

Abstract: A metal sheet-receiving system for receiving parts and feeding a metal sheet-folding machine, particularly a folding press comprising at least one manipulator for seizing and moving metal sheet parts with a gripper head fitted with gripping means; an electronic controlling device for controlling the movements of the manipulator; as well as a measuring system for determining the position of the metal sheet parts. The measuring system is formed by an optoelectronic measuring device, particularly an image acquisition means, and a transillumination platform.