WO2021074427A1 - Procédé d'assemblage de deux partenaires d'assemblage au moyen d'impulsions laser ultracourtes - Google Patents

Procédé d'assemblage de deux partenaires d'assemblage au moyen d'impulsions laser ultracourtes Download PDF

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Publication number
WO2021074427A1
WO2021074427A1 PCT/EP2020/079279 EP2020079279W WO2021074427A1 WO 2021074427 A1 WO2021074427 A1 WO 2021074427A1 EP 2020079279 W EP2020079279 W EP 2020079279W WO 2021074427 A1 WO2021074427 A1 WO 2021074427A1
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WIPO (PCT)
Prior art keywords
joining
area
laser
laser pulses
partners
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Application number
PCT/EP2020/079279
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German (de)
English (en)
Inventor
Felix Zimmermann
Original Assignee
Trumpf Laser- Und Systemtechnik Gmbh
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Application filed by Trumpf Laser- Und Systemtechnik Gmbh filed Critical Trumpf Laser- Und Systemtechnik Gmbh
Publication of WO2021074427A1 publication Critical patent/WO2021074427A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
    • B23K26/0608—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams in the same heat affected zone [HAZ]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
    • B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073—Shaping the laser spot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved
    • B23K26/324—Bonding taking account of the properties of the material involved involving non-metallic parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/50—Working by transmitting the laser beam through or within the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
    • B23K2103/54—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1606—Ultraviolet [UV] radiation, e.g. by ultraviolet excimer lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1609—Visible light radiation, e.g. by visible light lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1619—Mid infrared radiation [MIR], e.g. by CO or CO2 lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B29C65/1638—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding focusing the laser beam on the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • B29C65/1667—Laser beams characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous laser welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/223—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of a triangle wave or of a sawtooth wave, e.g. zigzagged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/229—Other specific patterns not provided for in B29C66/221 - B29C66/227
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/343—Making tension-free or wrinkle-free joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91951—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to time, e.g. temperature-time diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges

Definitions

  • the invention relates to a method for joining two joining partners by means of ultrashort laser pulses, preferably for joining at least one joining partner that is essentially transparent for the laser pulses with another joining partner, particularly preferably for joining two joining partners that are transparent for the laser pulses and in particular for joining two glasses by means of ultrashort laser pulses.
  • the processing laser beam is focused by appropriate optics and the associated beam shaping into the material of one of the joining partners, into both joining partners and / or into the area of an interface between the two mutually adjacent joining partners.
  • the strong local energy input from the focused laser beam results in high temperatures that are not present in the surrounding material areas.
  • the heat required for processing - for example for the production of a weld seam - leads to temperature stresses in relation to the surrounding material areas.
  • ultrashort laser pulses are focused in the volume of glass, e.g. quartz glass
  • the high intensity in the focus leads to non-linear absorption processes.
  • various material modifications can be made to the glass. If the time interval between the successive ultrashort laser pulses is shorter than the heat diffusion time, this leads to heat accumulation or a temperature rise in the glass in the focus area. With each of the successive pulses, the temperature can then be increased to the melting temperature of the glass and finally the glass can be locally melted.
  • the laser focus can be focused through the glass body aligned in the beam direction onto the interface between the joining partners. Due to the successive heat accumulation from pulse to pulse, the absorption zone shifts longitudinally in the direction of the laser incidence direction, so that finally the melt from the glass enters the interface.
  • the melt cools down, a stable connection between the two glasses can then be created, with the weld seam appearing elongated in the direction of laser incidence as a result of the previous process.
  • the melt bridges the gap so that glasses with smaller unevenness that are not completely flat against one another can also be joined.
  • a method for joining joining partners by means of ultrashort laser pulses of a joining beam is specified, preferably for joining at least one material that is essentially transparent for the laser pulses with a further joining partner, particularly preferably for joining two materials that are transparent for the laser pulses, with one ultrashort laser pulses being more comprehensive Joining beam for local melting of a joining area is introduced into the joint partner.
  • a process area is heated with at least one process beam, the joining beam and the process beam being placed next to one another in such a way that the joining area and the process area do not spatially overlap and / or the joining beam and the process beam are designed so that the laser pulses of the process beam and of the joining beam do not overlap in time.
  • a joining environment can be heated spatially around the joining area and / or before and / or after the joining process by means of the process beam.
  • the joining partners to be joined are in contact with one another at an interface.
  • the melting of the material of the joining partners in the joining area takes place, among other things, at the interface, so that the resulting melt bridges the interface and a joint is established at the interface after the melt has solidified.
  • the method is preferably applied to two joining partners made of glass, for example quartz glass, in which the joining beam of an ultrashort pulse laser is focused through the upper joining partner, which is transparent for the wavelength of the ultrashort pulse laser, into the vicinity or exactly on the common interface of the two joining partners.
  • the method can also be used to join a first joining partner that is transparent to the joining beam and a second joining partner that is essentially opaque to the joining beam, for example for joining a first joining partner made of glass with a second joining partner made of metal, for example aluminum.
  • the joining beam enters through the joining partner that is transparent to the joining beam.
  • the successive absorption of the laser pulses causes heat to accumulate, provided that the pulse rate of the joining beam is greater than the rate of heat dissipation through material-specific heat transport mechanisms. Due to the increasing temperature from pulse to pulse, the melting temperature of the joining partner can finally be reached, which leads to a local melting of the material of the first joining partner into which the joining beam enters. The resulting melt can bridge the common interface and permanently connect the parts to be joined together when it cools.
  • the size of the joining area is determined by the beam geometry, in particular the focus diameter of the joining beam.
  • a joining environment is defined here as the area that heats up as a whole as a result of the absorption of the joining beam and the subsequent heat transport.
  • the size and extent of the joining environment is determined by the heat diffusion time and the laser absorption capacity of the glass as well as the joining pulse rate.
  • the joining area can, for example, be twenty times the diameter of the joining area, or six to ten times the size of the joining area.
  • thermal gradients of a 50 ⁇ m wide weld seam can also show up to 400 ⁇ m outside the weld seam.
  • the joining area is additionally heated by the process beam in the process area.
  • the process area is determined analogously to the joining area via the beam geometry, in particular via the focus diameter of the process beam.
  • a process environment is defined here as the area that heats up overall as a result of the absorption of the process beam and the subsequent heat transport.
  • the size and extent of the process environment is included determined by the heat diffusion time and the laser absorption capacity of the joint partner, and thus by the average coupled process performance.
  • the process environment can, for example, be twenty times the diameter of the process area, or also ten times the size of the process area.
  • the joining environment and the process environment preferably overlap at least partially, so that, for example, the higher temperature in the process environment can reduce material stresses in the joining environment.
  • the overlap of the joining and process environment is given by the distance between the joining and process areas, the heat diffusion time of the glass and the corresponding laser absorption capacity for the joining and process laser light, and the average coupled power of the joining and process lasers.
  • the joining environment can thus be heated spatially around the joining area with a process laser if the process environment and the joining environment overlap.
  • the process beam can comprise ultrashort laser pulses or continuous wave radiation.
  • the process area can be heated before and / or after the joining process.
  • Time before the joining process means that the pulse of the joining beam hits an already heated joining area or hits the process environment.
  • Temporally after the joining process means that the process beam hits the joining area, or the overlap between the process area and the joining area is formed after the joining beam hits.
  • the time interval between the joining beam and the process beam should preferably be selected to be smaller than the typical heat diffusion time in the glass, for example smaller than 10 ps.
  • the process area can also be heated at the same time as the joining process.
  • the process beam and the joining beam can be generated by one and the same ultrashort pulse laser and, for example, to be split into two beams of different intensity by beam splitter optics.
  • a temporal offset of the pulses of the process beam and the joining beam can then be implemented through different beam paths and the associated different transit times of the partial beams to the joint partner.
  • the ultrashort pulse laser that generates the joining beam is referred to herein as the joining fiber.
  • the laser that generates the at least one process beam is referred to herein as a process laser. It is possible here for the process laser to be a continuous wave laser and the joining fiber to be an ultra-short pulse laser. In particular, the process laser and the joining fiber can also perform the other task mutatis mutandis.
  • process and joining fibers can be used synonymously - the joining beam and the process beam are nevertheless designed as separate beams.
  • the process laser can fulfill various functions regardless of the precise operating mode. For example, it can act thermally on material modifications or act on the surrounding areas of the material modification.
  • the process laser can also be used to produce tailor-made permanent material modifications, for example to heal stresses in the material, to reshape material or to expand previously produced weld seams.
  • One advantage of this method is that material stresses from the joining environment are healed or reduced by the process beam, so that crack formation is suppressed.
  • the joining beam and the at least one process beam are not generated by the same laser.
  • the joining pulse rate and the pulse repetition rate can be selected differently. Since the material of the joining partner should not be melted with the process beam, a lower average process output, for example through a lower pulse repetition rate with the same laser pulse intensity, can be selected as with the joining beam.
  • the process beam it is also possible for the process beam to have a different wavelength than the joining beam, or for the fluence of the process beam to be smaller than that of the joining beam due to a different focus.
  • the intensity in the joining spot introduced into the material by the joining fiber is preferably ten times greater than the intensity introduced into the material by the process laser in the heating spot.
  • the process beam can also have the same or lower intensity than the main beam.
  • the at least one process beam preferably has a central spot and at least one further process area.
  • a central spot means that there is a local maximum in the beam's intensity profile in the center of the beam.
  • a further process area is understood here to mean that a further area with a non-vanishing laser intensity follows radially from the central spot.
  • the central spot can also be used to join the glasses, with the further process area of low intensity only being used to heat the joining environment.
  • the intensity profile of the process laser can be impressed on the process environment of the process area, which in particular enables particularly advantageous thermal gradients to be implemented in the joining partners.
  • the profile of the central spot of the at least one process beam and / or the at least one further process area of the at least one process beam can be Gauss-shaped, or Bessel-shaped or Laguerre-Gauss-shaped, or as a superposition of the aforementioned.
  • Gaussian, Bessel or Laguerre-Gaussian intensity profiles correspond to the natural laser modes of a laser and so the method can be used without additional optical adjustment effort.
  • the at least one further process area of the at least one process beam can comprise at least one higher order of diffraction.
  • the heating profile of the process beam can be determined directly by a suitable choice of a higher diffraction order. It is thus possible to use diffraction orders that enable the most extensive possible illumination with the process beam.
  • the central spot and the at least one further process area of the at least one process beam can be offset longitudinally with respect to one another.
  • offset longitudinally means that the central spot and the process area are offset from one another in the direction of the beam.
  • spatial mode beating of the laser modes can be used constructively, so that several intensity maxima can result in the beam direction of the at least one process beam.
  • the process area and the central spot can also be offset from one another by means of suitable optics. This is particularly the case when several laser beams are superimposed to implement the process beam.
  • the process beam can also create a longitudinal heat profile in the glasses, since the stresses during the joining process not only fade out transversely along the interface, but can also protrude into the glass. In this way, material stresses in the glass can also be effectively reduced.
  • the beam shape of the at least one process beam can be generated by means of a beam-shaping unit and / or by means of a spatial light modulator and / or by means of a diffractive element and / or by means of an acousto-optical deflector.
  • a beam-shaping unit can in particular be an objective for focusing the laser beam.
  • a spatial light modulator enables the process beam to be fanned out to a given geometry, for example round, square or star-shaped.
  • a diffractive element also allows the process beam to be fanned out to a given geometry.
  • An acousto-optical deflector makes it possible to deflect the process beam periodically in time, so that in particular Lissajous-figure-shaped heating patterns can be generated in the interface so that a larger area is heated.
  • the deflection by means of acousto-optical deflector also allows a randomized movement pattern, so-called random access scanning, which enables the rapid scanning of any heating pattern.
  • the at least one process beam can be moved around the joining beam.
  • Moved around the joining beam means in this context that the process beam moves relative to the joining beam in a temporally variable manner.
  • the joining beam is the center of a movement of the process beam, such as, for example, the center of symmetry in the case of a radial movement or a pendulum movement.
  • a movement of the process beam around the joining beam comprises a movement along (longitudinal) or perpendicular (laterally) to the direction of movement of the joining beam.
  • the movement of the at least one process beam can be circular or figure-eight, or the trajectory of the movement can consist of two touching circles or similar geometries.
  • the joining beam can be placed in the center of symmetry, so that the glasses can be tempered symmetrically and evenly around the joining area.
  • the at least one process beam can precede or follow the joining beam, or run parallel and with a lateral offset to the joining beam.
  • a process beam following the joining beam can adjust any material defects such as tensions or cracks to the surroundings due to the heating of the material during the joining process.
  • cracks in one or both of the joining partners caused by the joining process can also be compensated for by the fact that the respective material flows into the crack and thus closes it.
  • the process beam runs in front of the joining beam when it is in front of it in the process direction of the joining beam.
  • the process beam follows the joining beam if the process beam is located behind the joining beam in the process direction of the joining beam.
  • the at least one process beam has a lateral offset when it does not coincide with the joining beam.
  • the movement of the at least one process beam runs parallel to the joining beam if it takes place at the same speed and in the same direction.
  • the joining beam can join the joining partners in the already relaxed state.
  • the method can also simultaneously enable slower cooling by the subsequent process beam.
  • the beams can have the same beam intensity.
  • the ultrashort pulse laser beam can be split into two equally intense beam parts with a 50-50 beam splitter.
  • the joining beam can also be preceded by two process beams and two process beams can follow it.
  • Two leading and trailing process beams have the advantage that the temperature can be controlled over a larger area.
  • a particularly advantageous embodiment of the method provides that the process beams are arranged symmetrically around the joining beam.
  • symmetrical around the joining beam means that the process beams lie, for example, on a common round or square geometry, in whose center of symmetry the joining beam is located.
  • the process beams can preferably each have approximately one tenth the intensity of the joining beam.
  • the movement of the at least one process beam can be generated by means of an acousto-optical deflector and / or a scanner unit and / or a micro-scanner.
  • the process beam is preferably designed in such a way that it does not melt the process area.
  • only the joining beam is designed to melt the material of the joining partners, whereas the at least one process beam only leads to heating of the process area, which does not lead to melting of the material in the process area.
  • FIGS. 1A, B show a schematic representation of a joining and process area
  • FIG. 2 shows a time profile of the ultra-short process and joining pulses
  • FIGS. 3A, B show a schematic representation of the process areas
  • FIG. 4 shows a longitudinal offset of the further process areas and the central spot
  • FIG. 5 shows a sketch of a general trajectory of the process beam around the joining beam
  • FIG. 6A, B, C circular, figure-eight and linear trajectories of the process beam around the joining beam
  • FIG. 7A B trajectories of a process beam when moving around the moving joining beam
  • FIG. 8 a sketch of possible trajectories of four process beams around the moving one
  • FIG. 9 shows a sketch of process beams placed symmetrically around the joining beam.
  • FIG. 1, comprising FIG. 1 A and FIG. 1 B, shows two joining partners 3 to be joined, which rest against one another at an interface 5.
  • the two joining partners 3 can be, for example, two glasses which are in contact with one another at the interface 5 and which are to be joined to one another at this interface 5.
  • a process beam 2 is placed laterally next to a joining beam 1. Both beams are focused in the interface 5 between the two joining partners 3, which is represented by the minimal beam waist.
  • the foci can, however, also be located under the interface of the materials to be joined.
  • the foci can, however, also fall apart and, for example, the focus of the joining beam 1 can be arranged below the interface 5 between the two joining partners 3 and the focus of the process beam 2 can then, for example, be placed in the interface 5 between the two joining partners 3.
  • the joining partners 3 are melted locally in the joining area 11.
  • the joining beam 1 comprises a number, for example ten, successive laser pulses which are successively absorbed by the joining partner 3 in the joining area 11.
  • this leads to heat accumulation in the joining partner 3, provided that the time interval between the pulses is shorter than the heat diffusion time of the joining partner 3.
  • the melting temperature can be exceeded and the joining partner 3 is locally melted.
  • it should be pointed out here that by cleverly positioning the laser focus it can be achieved that both joining partners can be melted at the same time. When the melt passes over the interface 5 and cools, it can lead to a stable connection between the two joining partners 3.
  • this heat is also given off into the joining environment 12 by heat diffusion in accordance with the heat diffusion time.
  • the joining temperature gradient depends on the difference between the melting temperature and the temperature of the joining partners outside the joining area. If this joining temperature gradient is too high, stresses can arise in the material 6, which ultimately lead to crack formation.
  • the joining temperature gradient In order to prevent the formation of cracks, the joining temperature gradient must therefore be reduced, but the temperature in the joining area always at least corresponds to the melting temperature of the joining partner. This can be done by heating the joining area to a higher temperature, or by artificially increasing the joining area so that the temperature difference is formed in the joining partner over a longer distance.
  • a process beam 2 is placed next to the joining beam 1.
  • the process beam 2 heats the process area 21.
  • no joining partner 3 should be melted with the process beam 2.
  • the average power of the process laser or the process beam 2 is, however, also absorbed in the process area 21 of the joining partner 3, so that there is a rise in temperature there.
  • the heat flows away from the process area 21 by heat diffusion, so that a process environment 22 is formed.
  • a heating temperature gradient that is smaller than the joining temperature gradient is thus also formed from the process area 21 to the edge of the process environment 22.
  • the temperature in the entire process environment 22 is increased or at least equal to the temperature of the joining partner 3 outside the joining environment 12 and the process environment 22.
  • the formed process environment 22 and joining environment 12 overlap. This ensures that the joint partner 3 has a higher temperature in the area of the overlap 4 than if no process environment 22 were formed .
  • the joining area 12 in particular now has an increased temperature in the area of the overlap 4, so that the joining temperature gradient from the joining area 11 to the edge of the joining area 12 in the area of the overlap 4 has been artificially reduced. Due to the lower joining temperature gradient, material stress 6 can thus be reduced.
  • the joining partner 3 has an entire temperature gradient, which now extends from the joining area 11 to the edge of the process area 21, so that the temperature decrease takes place over a larger area on average.
  • the roles of the joining and process lasers can be reversed mutatis mutandis.
  • the process beam 2 can also at least partially melt the process area 21 and thus expand the area melted in the joining environment 11 or expand a central modification.
  • FIG. 1A it is shown that in the joining area 11 or in the process area 21, the intensities of the joining or process beams are greatest.
  • the joining beam 1 is intense enough to melt the joining partner 3 near the interface 5, so that with successive ultrashort pulse absorption the melt center moves towards the interface 5, the melt exits there and via the interface 5 to the opposite joining partner 3 propagated, with which the melt then forms a firm bond when it cools.
  • the processing and joining fibers used have a tunable wavelength in the range from 200 nm to 5000 nm. Because of the wavelength range that goes beyond the optically visible range, in a further embodiment everything is considered to be glass that is transparent for the selected laser wavelength.
  • the repetition rates are between continuous wave irradiation, 100Hz and 50MHz. Bursts are also conceivable, the repetition rate of the pulses in the burst being between 1 MHz and 50 GHz.
  • the laser pulses are between 10fs and 50ps long.
  • the laser beams are also focused in such a way that a fluence in the focus zone of more than 10 mJ / cm 2 can be achieved.
  • the modification threshold of the joining partners is typically between 1 J / cm 2 and 5 J / cm 2 . In order to increase the strength of the weld, for example, the pulse energies can also be modulated over time.
  • FIG. 1 B the joining environment 12 and the process environment 22 are shown in a top view.
  • the process environment 22 and the joining environment 12 are formed so that they overlap in the overlap 4.
  • the joining area 12 experiences a temperature increase. If material tension should have arisen or arise in the overlap 4 because of the strong temperature gradient around the joining area 11, then this can be reduced by the additional heating process so that there is no crack or crack in the joining partner.
  • FIG. 2 shows that the joining beam 1 and the process beam 2 can strike at different times for one location.
  • the intensity I of a process pulse can be different from the intensity of the joining pulse.
  • the process beam can hit the joining partner both after the joining pulse (the abscissa axis points in the positive direction) and before the joining pulse (the abscissa axis points in the negative direction).
  • FIG. 3A shows how a central spot 23 and a further process area 24 are combined to form the actual process area 21 through a corresponding design of the process beam 2.
  • the intensity profile shown below shows that the central spot 23 and the further process area 24 can be composed of different beam profiles.
  • the intensity distribution of the central spot 23 is thus distributed over a significantly smaller area than that of the further process area 24.
  • FIG. 3B shows that the further process area 24 can also consist of a higher mode, in particular of Gauss, Bessel and / or Laguerre-Gauss modes.
  • FIG. 4 shows a process beam 2 which is focused in the first joining partner 3 in such a way that the central spot 23 of the process beam 2 lies at the interface 5 of the first joining partner in the direction of the beam.
  • the joining area 11 of the joining beam 1 (not shown) can coincide with the central spot 23.
  • the further process areas 24 are located longitudinally offset in relation to this in the joining partner 3 and not on the surface. As a result, material stresses 6 which run from the interface 5 into the joining partner 3 are reduced.
  • FIG. 5 shows an embodiment of the method in which the process beam 2 is moved around the joining beam 1.
  • the joining beam 1 is located at the origin of the coordinate system in order to make it clear that any symmetries of the process beam trajectory relate to the current location of the joining beam 1.
  • the time arrow is shown in such a way that it points to both positive and negative times. This is intended to symbolize at this point that the direction of the movement can be freely selected, so that, for example, clockwise or counterclockwise movements are possible.
  • FIG. 6 comprising FIGS. 6A, 6B and 6C, various possible movements of the process beam 2 are shown, namely circular 6A, figure-of-eight 6B and linear 6C.
  • the process beam 2 moves relative to the joining beam 1.
  • the different shapes can be produced, for example, with an acousto-optic deflector.
  • the process beam passes through an acousto-optic deflector, it is periodically deflected, for example in the x and y directions.
  • 2 Lissajous figures can be generated with the process beam.
  • FIG. 7A an embodiment of the method is shown in which the joining beam 1 is moved with a feed along the x-axis.
  • the feed is, for example, of the order of magnitude between 10 pm / s and 1 m / s.
  • the process beam 2 is moved in a circle around the joining beam 1.
  • FIG. 7B shows an embodiment in which the process beam moves linearly up and down relative to the joining beam along the y-axis. This results in a sawtooth curve of the process beam trajectory.
  • the process beam 2 follows the joining beam 1.
  • FIG. 8 shows an embodiment in which two process beams 2 each precede the joining beam 1 and two process beams 2 each follow.
  • the process beams 2 move on trajectories around the joining beam 1, which originate from a figure-eight movement.
  • FIG. 9 A further embodiment is shown in FIG. 9, in which two process beams 2 each lead in front of the joining beam 1 and two process beams 2 each follow the joining beam 1.
  • the process beams 2 are placed symmetrically around the joining beam 1, so that a symmetrical temperature gradient around the joining area 11 can be implemented.
  • the process beams 2 have a lower intensity than the joining beam, for example 10% each of the joining beam intensity, which is characterized by the smaller diameter of the process beams in the figure.
  • the process beams 2 that follow the joining beam 1 can adjust any material defects, such as tension or cracks, to the surroundings due to the heating of the material following the actual joining process during the joining process.
  • cracks in one or both of the joining partners caused by the joining process can also be compensated for by the fact that the respective material flows into the crack and thus closes it.

Abstract

L'invention concerne un procédé d'assemblage de deux partenaires d'assemblage (3) au moyen d'impulsions laser ultracourtes d'un faisceau d'assemblage, de préférence pour assembler au moins un partenaire d'assemblage qui est sensiblement transparent aux impulsions laser à un partenaire d'assemblage supplémentaire, de manière particulièrement préférée pour assembler deux partenaires d'assemblage qui sont transparents aux impulsions laser, un faisceau d'assemblage (1) comprenant des impulsions laser ultracourtes étant introduit dans les partenaires d'assemblage (5) pour faire fondre localement une région d'assemblage (11). De cette manière, une région de traitement (21) est chauffée avec au moins un faisceau de traitement (2), le faisceau d'assemblage (1) et le faisceau de traitement (2) étant positionnés l'un à côté de l'autre de sorte que la région d'assemblage (11) et la région de traitement (21) ne se chevauchent pas physiquement et/ou le faisceau d'assemblage (1) et le faisceau de traitement (2) étant conçus de sorte que les impulsions laser du faisceau de traitement (2) et du faisceau d'assemblage (1) ne se chevauchent pas dans le temps.
PCT/EP2020/079279 2019-10-18 2020-10-16 Procédé d'assemblage de deux partenaires d'assemblage au moyen d'impulsions laser ultracourtes WO2021074427A1 (fr)

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