JP2004188802A - Laser welding method of resin member - Google Patents

Laser welding method of resin member Download PDF

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Publication number
JP2004188802A
JP2004188802A JP2002359870A JP2002359870A JP2004188802A JP 2004188802 A JP2004188802 A JP 2004188802A JP 2002359870 A JP2002359870 A JP 2002359870A JP 2002359870 A JP2002359870 A JP 2002359870A JP 2004188802 A JP2004188802 A JP 2004188802A
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JP
Japan
Prior art keywords
resin material
laser
contact surface
laser welding
transparent resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002359870A
Other languages
Japanese (ja)
Inventor
Wataru Terasawa
亘 寺澤
Hideo Nakamura
秀生 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
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Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP2002359870A priority Critical patent/JP2004188802A/en
Publication of JP2004188802A publication Critical patent/JP2004188802A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt 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
    • B29C66/43—Joining a relatively small portion of the surface of said 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • 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
    • B29C65/1612—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
    • 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
    • B29C66/70—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
    • B29C66/71—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 composition of the plastics material 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
    • 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
    • B29C66/733—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7332—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being coloured
    • 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
    • B29C66/733—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73361—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being opaque to visible light
    • 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
    • B29C66/733—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser welding method for obtaining a resin member excellent in leak resistance. <P>SOLUTION: In the laser welding method for heating and melting the contact interface of a transmittable resin material, which comprises a transmittable resin having transmitting properties with respect to a laser beam being a heating source, and a non-transmittable resin material which comprises a non-transmittable resin having no transmitting properties with respect to the laser beam, by the irradiation with the laser beam from the transmittable resin material to weld the resin materials, at least one of the contact surface parts for forming the contact interface of the transmittable resin material and the non-transmittable resin material is heated and softened, and the transmittable resin material and the non-transmittable resin material are irradiated with the laser beam in a pressure contact state. In the laser welding method for the resin member, the resin member suppressed in the occurrence of welding failure and excellent in the leak resistance of the welded part can be manufactured by laser welding. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、樹脂部材のレーザー溶着方法に関する。
【０００２】
【従来の技術】
近年、軽量化及び低コスト化等の観点より、自動車部品等、各種分野の部品を樹脂化して樹脂成形品とすることが頻繁に行われている。そして、樹脂成形品は、高生産性化等の観点から、樹脂成形品を予め複数の樹脂材に分割して成形し、これらの樹脂材を互いに接合して製造する手段が採られることが多くなっている。
【０００３】
そして、樹脂材同士を接合する接合方法には、レーザー溶着方法が利用されている。レーザー溶着は、レーザー光に対して透過性のある透過樹脂材と、レーザー光に対して透過性のない非透過樹脂材とを重ね合わせた後、透過樹脂材側からレーザー光を照射することにより、透過樹脂材と非透過樹脂材との当接面同士を加熱溶融させて両者を一体的に接合する方法である。
【０００４】
このレーザ溶着方法は、透過樹脂材内を透過したレーザー光が非透過樹脂材の当接面に到達して吸収され、当接面に吸収されたレーザー光がエネルギーとして蓄積される。そして、非透過樹脂材の当接面が加熱溶融されるとともに、この非透過樹脂材の当接面からの熱伝達により透過樹脂材の当接面が加熱溶融される。この状態で、透過樹脂材及び非透過樹脂材の当接面同士を圧着させることで、両者が一体的に接合される。
【０００５】
ところで、上記したようなレーザー溶着においては、透過樹脂材および非透過樹脂材の当接面同士を確実に溶着させて十分な接合強度を得るためには、透過樹脂材および非透過樹脂材の当接面同士の隙間を極力小さくまたは無しにする必要がある。当接面に隙間があると、非透過樹脂材の当接面における発熱が透過樹脂材の当接面に熱伝達されにくくなる。そして、透過樹脂材の当接面における加熱溶融が不十分となって、非透過樹脂材と透過樹脂材との当接面同士が十分に溶着しなくなる。
【０００６】
さらに、非透過樹脂材と透過樹脂材との当接面に隙間が存在すると、レーザー溶着により溶着が行われても、充分な溶着強度が得られないという問題がある。詳しくは、非透過樹脂材と透過樹脂材との当接面に隙間が存在した状態でレーザー溶着が行われると、非透過樹脂材が溶融したときの溶融膨張により隙間が埋められて溶着される。すなわち、非透過樹脂材の見かけ密度が低下している。このため、溶着強度が低下する。そして、当接面における隙間量が増加するにしたがって、溶着強度が低下するようになる。この当接面の隙間量と溶着強度の関係を図３に示した。
【０００７】
さらに、非透過樹脂材と透過樹脂材との当接面に隙間が存在すると、溶接後の樹脂部材のシール性が低下するという問題もあった。具体的には、両樹脂材の当接面にすき間が存在した状態でレーザー溶着を行うと、樹脂部材の溶着部にすき間が残る。すなわち、溶着部を気体や液体などの流体が通過可能となり、樹脂部材の気密性、液密性が十分に確保できなかった。
【０００８】
両樹脂材の当接面の隙間は、樹脂材の形状が複雑になったり、樹脂材の大きさが大きくなったりしたときに生じやすくなっていた。樹脂材の形状が複雑になると、当接面が複雑な形状となり溶着時に圧接しにくくなる。また、樹脂材の大きさが大きくなると、樹脂部材の表面にそりやうねりあるいはねじれが生じるようになり、当接面にずれが生じるようになり、このずれにより隙間が生じるようになる。
【０００９】
このレーザー溶着方法を用いた溶着方法としては、たとえば、特許文献１，２に示されている。
【００１０】
特許文献１には、「共に熱可塑性を有し、一方のみがレーザ光を透過する透過性を有する第１、第２の樹脂材を密着せしめ、または少なくとも一方が透過性を有する第１、第２の部材をレーザ光を吸収して加熱されることで接着作用を有する接着材を介して密着せしめ、前記透過性を有する樹脂材又は前記透過性を有する部材を介してレーザ光を照射し、第１、第２の樹脂材又は前記第１、第２の部材を接着するようにしたレーザによる部材の接着方法。」が開示されている。
【００１１】
特許文献１に記載の溶着方法には、溶着される二つの樹脂材の当接面の間に接着材を配した溶着方法が開示されているが、当接面のすき間が大きくなると、接着材の熱が照射された側の樹脂材（透過樹脂材）にしか伝達されず、十分な溶着性能が得られないという問題があった。
【００１２】
特許文献２には、「熱可塑性合成樹脂からなるものであって所定のレーザ光を透過する物体からなるもの（以下透明部材という）の、その端部のところに、熱可塑性合成樹脂からなるものであって所定のレーザ光を吸収する物体からなるもの（以下不透明部材という）を接触させ、しかる後に、上記透明部材側から所定のレーザ光を、上記透明部材と不透明部材とが接するところに、その焦点が合致するように照射し、更に、このようなレーザ光の照射の後、上記両熱可塑性合成樹脂製部材の接触部周りが柔軟性を帯びるようになった状態において、これら両者の間を所定の手段にて圧着するようにした工程からなることを特徴とする熱可塑性合成樹脂製部材のレーザ光による溶着方法。」が開示されている。
【００１３】
特許文献２に記載の溶着方法には、二つの樹脂材の当接面を溶融させてローラーにより圧着させた溶着方法が開示されているが、高い溶着性を確保するためには加圧のためのリブを形成する必要があり、樹脂材の形状が複雑な形状となると、ローラーによる加圧が困難となるという問題があった。さらに、ガラス等の材質を立ち壁部に溶着するような場合においては、両者の加圧が十分に行うことができないという問題があった。
【００１４】
【特許文献１】
特公平５−４２３３６号公報
【特許文献２】
特開平１１−１７０３７１号公報
【００１５】
【発明を解決しようとする課題】
本発明は上記実状に考えてなされたものであり、耐リーク性にすぐれた樹脂部材を得られるレーザー溶着方法を提供することを課題とする。
【００１６】
【課題を解決するための手段】
上記課題を解決するために本発明者らはあらかじめ樹脂材の当接面を加熱して軟化させた状態でレーザー溶着することで上記課題を解決できることを見いだした。
【００１７】
すなわち、本発明の樹脂部材のレーザー溶着方法は、加熱源としてのレーザー光に対して透過性のある透過樹脂よりなる透過樹脂材と、レーザー光に対して透過性のない非透過樹脂よりなる非透過樹脂材との当接界面を、透過樹脂材側からのレーザー光の照射により加熱溶融させて溶着する樹脂部材のレーザー溶着方法であって、透過樹脂材および非透過樹脂材の当接界面を形成する当接面部の少なくとも一方が加熱されて軟化し、かつ透過樹脂材および非透過樹脂材が圧接した状態でレーザー光が照射されることを特徴とする。
【００１８】
本発明の樹脂部材のレーザー溶着方法は、当接面部をあらかじめ軟化させた状態でレーザー溶着を行うため、透過樹脂材と非透過樹脂材の当接界面のすき間を消失させた状態でレーザー光の照射を行うことができる。すなわち、溶着された樹脂部材の透過樹脂材と非透過樹脂材の当接界面にすき間が残留しなくなっている。この結果、本発明の樹脂部材のレーザー溶着方法は、溶着不良の発生を抑えられかつ溶着部の耐リーク性にすぐれた樹脂部材をレーザー溶着により製造することができる。
【００１９】
【発明の実施の形態】
本発明の樹脂部材のレーザー溶着方法は、加熱源としてのレーザー光に対して透過性のある透過樹脂よりなる透過樹脂材と、レーザー光に対して透過性のない非透過樹脂よりなる非透過樹脂材との当接界面を、透過樹脂材側からのレーザー光の照射により加熱溶融させて溶着する樹脂部材のレーザー溶着方法である。
【００２０】
レーザー溶着は、レーザー光をエネルギー源として透過樹脂材と非透過樹脂材の界面に照射し、両者の当接界面を加熱溶融させた後に凝固させて溶着する。
【００２１】
具体的には、まず、透過樹脂材内を透過したレーザー光が非透過樹脂材の当接面に到達し、当接面から非透過樹脂材に吸収される。当接面から吸収されたレーザー光がエネルギーとして蓄積される。そして、蓄積されたエネルギーが非透過樹脂材の当接面を加熱溶融するとともに、熱伝達により当接した透過樹脂材の当接面を加熱溶融する。加熱溶融した両樹脂材の溶融液が混合して絡み合った界面を形成する。この状態で溶融液が凝固し、両樹脂材を構成する両樹脂が溶融して互いに入り込み絡まった溶着部が形成される。このことから、レーザー溶着は、強固な接合状態を構成して高い接合強度及び耐圧強度を有する樹脂部材を得ることができる。
【００２２】
本発明のレーザー溶着方法は、透過樹脂材および非透過樹脂材の当接界面を形成する当接面部の少なくとも一方が加熱されて軟化し、かつ透過樹脂材および非透過樹脂材が圧接した状態でレーザー光が照射される。透過樹脂材および非透過樹脂材の少なくとも一方の当接面部が軟化して両樹脂材が圧接されることで、両樹脂材の当接界面におけるすき間が消失する。そして、このすき間が消失した当接界面にレーザー光の照射が行われることで、両樹脂材が加熱溶融して凝固することで、両樹脂材が溶着される。
【００２３】
本発明のレーザー溶着方法において、透過樹脂材および非透過樹脂材の当接面部の軟化は、少なくとも一方の当接面部においてなされていればよく、両樹脂材の当接面部がともに軟化していることが好ましい。
【００２４】
本発明のレーザー溶着方法において、透過樹脂材および非透過樹脂材の当接面部の軟化は、両樹脂材が圧接されたときに両樹脂材の当接界面のすき間を塑性変形により埋めることができる程度に軟化していればよい。
【００２５】
本発明のレーザー溶着方法において、透過樹脂材および非透過樹脂材の当接面部を軟化させる方法は、特に限定されない。
【００２６】
当接面部の軟化は、予備加熱レーザー光の照射によりなされたことが好ましい。予備加熱レーザー光を照射することで、少なくとも非透過樹脂材の当接面部を軟化させることができる。
【００２７】
予備加熱レーザーは、透過樹脂材と非透過樹脂材とが圧接した状態で照射されることが好ましい。すなわち、透過樹脂材と非透過樹脂材とが溶着される状態で圧接された状態で予備加熱レーザー光が照射されることで、予備加熱レーザー光により軟化させた後に、レーザー溶着を行うことが可能となり、非透過樹脂材に蓄積した熱エネルギーをレーザー溶着に利用できる。さらに、当接面部が軟化した樹脂材の移動がなく、樹脂材の当接面部の変形が生じにくくなり、寸法精度の低下が抑えられる。
【００２８】
なお、予備加熱レーザー光は、照射された樹脂材を軟化できるレーザー光であれば限定されない。すなわち、レーザー溶着時に照射されるレーザー光を発生させるレーザー発生源から発生したレーザー光でも、異なるレーザー発生源から発生したレーザー光でも、どちらでもよい。ここで、予備加熱レーザーとレーザー溶着時に照射されるレーザー光が同一のレーザー発生源から発せられたレーザー光である場合には、レーザー光の出力や照射時間を変化させて、予備加熱レーザー光の照射時に溶着が生じないようにする。
【００２９】
当接面部の軟化は、当接面部に加熱部材に当接してなされたことが好ましい。加熱部材を当接面部に当接させることで、加熱部材からの熱が当接面部に伝導し、当接面部が熱により軟化する。加熱部材による加熱は、当接面からの距離と樹脂材の温度がほぼ比例することから、当接面部の形状が複雑化したときに、加熱ムラの発生を抑えることができる。
【００３０】
加熱部材は当接面部に当接したときに当接面部に熱を伝導できる部材であれば特に限定されない。たとえば、加熱された部材等をあげることができる。
【００３１】
当接面部の軟化は、当接面部に温風を吹き付けてなされたことが好ましい。温風を吹き付けることで、安価にかつ簡単に当接面部を軟化させることができる。
【００３２】
当接面部の軟化は、透過樹脂材および／または非透過樹脂材の当接面部が導電体が分散してなり、電磁誘導により加熱されたことが好ましい。
【００３３】
本発明の溶着方法において、非透過樹脂材に用いる樹脂の種類としては、熱可塑性を有し、加熱源としてのレーザ光を透過させずに吸収しうるものであれば特に限定されない。たとえば、ナイロン６（ＰＡ６）やナイロン６６（ＰＡ６６）等のポリアミド（ＰＡ）、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、スチレン−アクリロニトリル共重合体、ポリエチレンテレフタレート（ＰＥＴ）、ポリスチレン、ＡＢＳ、アクリル（ＰＭＭＡ）、ポリカーボネート（ＰＣ）、ポリブチレンテレフタレート（ＰＢＴ）、ＰＰＳ等に、カーボンブラック、染料や顔料等の所定の着色材を混入したものをあげることができる。なお、必要に応じて、ガラス繊維、カーボン繊維等の補強繊維を添加したものを用いてもよい。
【００３４】
透過樹脂材に用いる樹脂の種類としては、熱可塑性を有し、加熱源としてのレーザ光を透過させうるものであれば特に限定されない。たとえば、ナイロン６（ＰＡ６）やナイロン６６（ＰＡ６６）等のポリアミド（ＰＡ）、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、スチレン−アクリロニトリル共重合体、ポリエチレンテレフタレート（ＰＥＴ）、ポリスチレン、ＡＢＳ、アクリル（ＰＭＭＡ）、ポリカーボネート（ＰＣ）、ポリブチレンテレフタレート（ＰＢＴ）等を挙げることができる。なお、必要に応じて、ガラス繊維、カーボン繊維等の補強繊維や着色材を添加したものを用いてもよい。
【００３５】
また、透過樹脂材、非透過樹脂材および弾性材に用いる樹脂の組合せについては、互いに相溶性のあるもの同士の組合せであることが好ましい。このような組合せとしては、ナイロン６同士やナイロン６６同士等、同種の樹脂同士の組合せの他、ナイロン６とナイロン６６との組合せ、ＰＥＴとＰＣとの組合せやＰＣとＰＢＴとの組合せ等を挙げることができる。
【００３６】
本発明の溶着方法において当接界面に照射されるレーザー光の種類としては、レーザー光を透過させる透過樹脂材の吸収スペクトルや板厚（透過長）等との関係から適宜選定して用いることができる。例えば、ガラス：ネオジム3+レーザー、ＹＡＧ：ネオジム3+レーザー、ルビーレーザー、ヘリウム−ネオンレーザー、クリプトンレーザー、アルゴンレーザー、Ｈ2レーザー、Ｎ2レーザー、半導体レーザー等のレーザー光をあげることができる。より好ましいレーザーとしては、ＹＡＧ：ネオジム3+レーザー（レーザー光の波長：１０６０ｎｍ）や半導体レーザー（レーザー光の波長：５００〜１０００ｎｍ）をあげることができる。
【００３７】
また、レーザー光の出力は、５０〜９００Ｗであることが好ましい。レーザー光の出力が５０Ｗ未満では、出力が低く樹脂材の当接面を互いに溶融させることが困難となり、９００Ｗを超えると、出力が過剰となり樹脂材が蒸発したり、変質するという問題が生じるようになる。
【００３８】
本発明の樹脂部材のレーザー溶着方法は、当接面部をあらかじめ軟化させた状態でレーザー溶着を行うため、透過樹脂材と非透過樹脂材の当接界面のすき間を消失させた状態でレーザー光の照射を行うことができる。すなわち、溶着された樹脂部材の透過樹脂材と非透過樹脂材の当接界面にすき間が残留しなくなっている。この結果、本発明の樹脂部材のレーザー溶着方法は、溶着不良の発生を抑えられかつ溶着部の耐リーク性にすぐれた樹脂部材をレーザー溶着により製造することができる。
【００３９】
【実施例】
以下、実施例を用いて本発明を説明する。
【００４０】
本発明の実施例として、透過性樹脂材と非透過性樹脂材のレーザー溶着を行った。
【００４１】
（実施例１）
本実施例は、透過性樹脂よりなる試験片と、非透過性樹脂よりなり弾性材が一体に形成された試験片と、を成形し、両試験片をレーザー溶着により溶着した。本実施例の様子を図１に示した。
【００４２】
まず、非透過性樹脂よりなる試験片１を成形した。非透過性樹脂よりなる試験片１は、ナイロン６ガラス強化材にカーボンブラックおよび着色材を混入してなる。非透過樹脂材１は、カーボンブラックおよび着色材を混入させたことで、レーザー光に対して吸収性を持つようになっている。
【００４３】
つづいて、透過性樹脂よりなる試験片２を成形した。透過性樹脂よりなる試験片１は、ナイロン６ガラス強化材よりなる。
【００４４】
その後、両試験片１、２を圧接させた。両試験片１、２が圧接した状態で、両試験片１、２の当接界面にレーザーヘッドから発せられた予備加熱レーザー光３を当接界面に沿って走査するように照射した。照射された予備加熱レーザー光３は、試験片２を透過して試験片１の表面に到達し、吸収された。そして、試験片１に吸収された予備加熱レーザー光はエネルギーとして蓄積される。この結果、試験片１の当接面部が加熱されて軟化した。
【００４５】
両試験片１、２は圧接しているため、両試験片１、２の当接界面にすき間が存在していると、試験片１の軟化した当接面部が塑性変形を生じてこのすき間が試験片１により埋められる。
【００４６】
両試験片１、２の間のすき間が埋められた状態で、両試験片１、２の当接界面にレーザーヘッドから発せられたレーザー光４を当接界面に沿って走査するように照射した。照射されたレーザー光４は、試験片２を透過して試験片１の表面に到達し、吸収された。そして、試験片１に吸収されたレーザー光はエネルギーとして蓄積される。この結果、試験片１の当接面部が加熱溶融されるとともに、この試験片１の当接面からの熱伝達により試験片２の当接面が加熱溶融される。そして、両試験片１、２が圧接されていることから、試験片１、２が一体的に接合した。
【００４７】
本実施例のレーザー溶着に用いられたレーザー光は、波長が９４０ｎｍの半導体レーザーであり、出力は５０〜９００Ｗ、加工速度は０．５〜５ｍ／ｍｉｎとした。予備加熱レーザー光は、前述のレーザー光より低い出力で照射された。なお、レーザー溶着のレーザー光と予備加熱レーザー光はともに半導体レーザーから発せられた光線であるが、本実施例において両レーザー光は、異なるレーザーヘッドから発せられた。
【００４８】
本実施例のレーザー溶着は、両試験片１、２の間のすき間が埋められた状態で行われていることから、両試験片１、２の溶着部にすき間がなくなっている。すなわち、溶着部のすき間により生じるリークの発生が生じなくなっている。また、両試験片１、２は、十分な溶着強度で溶着できた。
【００４９】
以上に示したように、本実施例は、両試験片１、２の溶着部における溶着不良およびリークが生じなくなっている。
【００５０】
（実施例２）
まず、実施例１と同様の試験片１、２を成形した。
【００５１】
成形された両試験片１、２の当接面を熱板５に当接させた。この熱板５と両試験片１、２の当接により、両試験片１、２の当接面部が軟化した。
【００５２】
その後、ただちに両試験片１、２を圧接して、両試験片１、２の当接面部同士を密着させた。この当接面部同士の密着により、両試験片１、２の間のすき間が埋められた。詳しくは、当接面が凹凸を有していても、軟化した状態で密着することで、当接面部を形成する樹脂が塑性変形を生じ、凹凸が消失したためである。
【００５３】
両試験片１、２の間のすき間が埋められた状態で、両試験片１、２の当接界面にレーザーヘッドから発せられたレーザー光４を当接界面に沿って走査するように照射した。照射されたレーザー光４は、試験片２を透過して試験片１の表面に到達し、吸収された。そして、試験片１に吸収されたレーザー光はエネルギーとして蓄積される。この結果、試験片１の当接面部が加熱溶融されるとともに、この試験片１の当接面からの熱伝達により試験片２の当接面が加熱溶融される。そして、両試験片１、２が圧接されていることから、試験片１、２が一体的に接合した。
【００５４】
なお、本実施例において当接界面に照射されたレーザー光は、実施例１と同様なレーザー光である。
【００５５】
本実施例のレーザー溶着は、両試験片１、２の間のすき間が埋められた状態で行われていることから、両試験片１、２の溶着部にすき間がなくなっている。すなわち、溶着部のすき間により生じるリークの発生が生じなくなっている。また、両試験片１、２は、十分な溶着強度で溶着できた。
【００５６】
以上に示したように、本実施例は、両試験片１、２の溶着部における溶着不良およびリークが生じなくなっている。
【００５７】
【発明の効果】
本発明の樹脂部材のレーザー溶着方法は、当接面部をあらかじめ軟化させた状態でレーザー溶着を行うため、透過樹脂材と非透過樹脂材の当接界面のすき間を消失させた状態でレーザー光の照射を行うことができる。すなわち、溶着された樹脂部材の透過樹脂材と非透過樹脂材の当接界面にすき間が残留しなくなっている。この結果、本発明の樹脂部材のレーザー溶着方法は、溶着不良の発生を抑えられかつ溶着部の耐リーク性にすぐれた樹脂部材をレーザー溶着により製造することができる。
【図面の簡単な説明】
【図１】実施例１のレーザー溶着を示した図である。
【図２】実施例２のレーザー溶着を示した図である。
【図３】樹脂部材の当接面の隙間量と溶着強度の関係を示した図である。
【符号の説明】
１…非透過性樹脂材よりなる試験片
２…透過性樹脂材よりなる試験片
３…予備加熱レーザー光
４…レーザー光
５…熱板[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a laser welding method for a resin member.
[0002]
[Prior art]
2. Description of the Related Art In recent years, from the viewpoints of weight reduction and cost reduction, parts of various fields such as automobile parts are frequently resinified to be resin molded products. In order to increase the productivity of the resin molded product, a method of dividing the resin molded product into a plurality of resin materials in advance and molding the same and joining these resin materials to each other is often employed. Has become.
[0003]
As a joining method for joining the resin materials, a laser welding method is used. Laser welding is performed by laminating a transparent resin material that is transparent to laser light and a non-transparent resin material that is not transparent to laser light, and then irradiating the laser light from the transparent resin material side. In this method, the contact surfaces of the permeable resin material and the non-permeable resin material are heated and melted to integrally join them.
[0004]
In this laser welding method, the laser light transmitted through the transparent resin material reaches and is absorbed by the contact surface of the non-transparent resin material, and the absorbed laser light is accumulated as energy. Then, the contact surface of the non-transparent resin material is heated and melted, and the contact surface of the transparent resin material is heated and melted by heat transfer from the contact surface of the non-transparent resin material. In this state, the contact surfaces of the permeable resin material and the non-permeable resin material are press-bonded to each other so that they are integrally joined.
[0005]
By the way, in the laser welding as described above, in order to ensure that the contact surfaces of the transparent resin material and the non-transparent resin material are welded to each other and to obtain a sufficient bonding strength, the welding of the transparent resin material and the non-transparent resin material is required. It is necessary to minimize or eliminate the gap between the contact surfaces. If there is a gap in the contact surface, heat generated on the contact surface of the non-transparent resin material is less likely to be transferred to the contact surface of the transparent resin material. Then, the heating and melting at the contact surface of the permeable resin material become insufficient, so that the contact surfaces of the non-permeable resin material and the permeable resin material are not sufficiently welded to each other.
[0006]
Furthermore, if there is a gap on the contact surface between the non-transmissive resin material and the transmissive resin material, there is a problem that sufficient welding strength cannot be obtained even if welding is performed by laser welding. Specifically, when laser welding is performed in a state where there is a gap on the contact surface between the non-permeable resin material and the transparent resin material, the gap is filled and welded by melt expansion when the non-permeable resin material is melted . That is, the apparent density of the non-transparent resin material is reduced. For this reason, the welding strength decreases. Then, as the amount of the gap on the contact surface increases, the welding strength decreases. FIG. 3 shows the relationship between the gap amount of the contact surface and the welding strength.
[0007]
Further, if there is a gap on the contact surface between the non-permeable resin material and the transparent resin material, there is a problem that the sealing property of the resin member after welding is reduced. Specifically, when laser welding is performed in a state where a gap exists between the contact surfaces of the two resin materials, a gap remains in the welded portion of the resin member. That is, a fluid such as a gas or a liquid can pass through the welded portion, and the air-tightness and liquid-tightness of the resin member cannot be sufficiently ensured.
[0008]
The gap between the contact surfaces of the two resin materials is likely to be generated when the shape of the resin material becomes complicated or when the size of the resin material becomes large. When the shape of the resin material becomes complicated, the contact surface becomes complicated, and it is difficult to perform pressure welding during welding. In addition, when the size of the resin material is increased, the surface of the resin member may be warped, undulated, or twisted, causing a shift in the contact surface, and a gap may be generated due to the shift.
[0009]
As a welding method using this laser welding method, for example, Patent Documents 1 and 2 disclose.
[0010]
Patent Literature 1 states that “the first and second resin materials having both thermoplastic properties, only one of which has a permeability to transmit a laser beam, are adhered to each other, or at least one of the first and second resins having a transparency. The second member absorbs the laser beam and is brought into close contact with an adhesive having an adhesive effect by being heated, and is irradiated with the laser beam through the transparent resin material or the transparent member, A method of bonding members using a laser that bonds the first and second resin materials or the first and second members. "
[0011]
The welding method described in Patent Document 1 discloses a welding method in which an adhesive is disposed between contact surfaces of two resin materials to be welded. However, if a gap between the contact surfaces becomes large, the adhesive material is removed. Is transmitted only to the resin material (transmission resin material) on the irradiated side, and there is a problem that sufficient welding performance cannot be obtained.
[0012]
Patent Literature 2 discloses that “a material made of a thermoplastic synthetic resin and formed of an object that transmits a predetermined laser beam (hereinafter, referred to as a transparent member), and a material formed of a thermoplastic synthetic resin at an end portion thereof. Then, an object that absorbs a predetermined laser light (hereinafter referred to as an opaque member) is brought into contact, and thereafter, the predetermined laser light is applied from the transparent member side to a place where the transparent member and the opaque member come into contact with each other. Irradiation is performed so that the focus is matched, and further, after such laser beam irradiation, in a state in which the surroundings of the contact portions of the thermoplastic synthetic resin members become flexible, a space between the two is made. Of the thermoplastic synthetic resin member using a laser beam. "
[0013]
The welding method described in Patent Document 2 discloses a welding method in which a contact surface of two resin materials is melted and pressed by a roller. When the resin material has a complicated shape, it is difficult to apply pressure by a roller. Further, when a material such as glass is welded to the standing wall, there is a problem that both cannot be sufficiently pressurized.
[0014]
[Patent Document 1]
Japanese Patent Publication No. 5-42336 [Patent Document 2]
JP-A-11-170371
Problems to be Solved by the Invention
The present invention has been made in view of the above situation, and an object of the present invention is to provide a laser welding method capable of obtaining a resin member having excellent leak resistance.
[0016]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors have found that the above problems can be solved by laser welding in a state where the contact surface of the resin material is heated and softened in advance.
[0017]
That is, the laser welding method of the resin member of the present invention includes a transparent resin material made of a transparent resin that is transparent to laser light as a heating source and a non-transparent resin made of a non-transparent resin that is not transparent to laser light. A method for laser welding a resin member in which a contact interface with a transparent resin material is heated and melted by irradiating a laser beam from the transparent resin material side and welded, wherein a contact interface between a transparent resin material and a non-transparent resin material is formed. At least one of the contact surfaces to be formed is heated and softened, and is irradiated with laser light in a state where the transparent resin material and the non-transparent resin material are pressed against each other.
[0018]
In the laser welding method of the resin member of the present invention, the laser welding is performed in a state where the contact surface is softened in advance. Irradiation can be performed. That is, no gap remains at the contact interface between the permeable resin material and the non-permeable resin material of the welded resin member. As a result, according to the laser welding method for a resin member of the present invention, it is possible to manufacture a resin member that suppresses the occurrence of poor welding and has excellent leak resistance at the welded portion by laser welding.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
The laser welding method for a resin member according to the present invention includes a transparent resin material made of a transparent resin that is transparent to laser light as a heating source and a non-transparent resin made of a non-transparent resin that is not transparent to laser light. This is a laser welding method for a resin member in which a contact interface with a material is heated and melted by laser light irradiation from the transparent resin material side and welded.
[0020]
Laser welding is performed by irradiating an interface between a transparent resin material and a non-transparent resin material using a laser beam as an energy source, heating and melting the contact interface between the two, and then solidifying and welding.
[0021]
Specifically, first, the laser light transmitted through the transparent resin material reaches the contact surface of the non-transparent resin material and is absorbed by the non-transparent resin material from the contact surface. The laser light absorbed from the contact surface is stored as energy. Then, the stored energy heats and melts the contact surface of the non-transparent resin material, and heats and melts the contact surface of the transparent resin material contacted by heat transfer. The melts of the two resin materials melted by heating are mixed to form an entangled interface. In this state, the molten liquid solidifies, and the two resins constituting the two resin materials are melted to form a welded portion that is entangled with each other. From this, the laser welding can form a strong joining state, and can obtain a resin member having high joining strength and high pressure resistance.
[0022]
In the laser welding method of the present invention, at least one of the contact surface portions forming the contact interface between the transparent resin material and the non-transparent resin material is heated and softened, and the transparent resin material and the non-transparent resin material are pressed against each other. Laser light is applied. At least one of the contact surfaces of the transparent resin material and the non-transparent resin material is softened and the two resin materials are pressed against each other, so that the gap at the contact interface between the two resin materials disappears. Then, by applying laser light to the contact interface where the gap has disappeared, the two resin materials are heated and melted and solidified, so that the two resin materials are welded.
[0023]
In the laser welding method of the present invention, the softening of the contact surfaces of the transparent resin material and the non-transparent resin material may be performed on at least one of the contact surfaces, and the contact surfaces of both resin materials are softened together. Is preferred.
[0024]
In the laser welding method of the present invention, the softening of the contact surface portion between the transparent resin material and the non-transparent resin material can fill the gap at the contact interface between both resin materials by plastic deformation when both resin materials are pressed. What is necessary is just to soften to the extent.
[0025]
In the laser welding method of the present invention, the method of softening the contact surface between the transparent resin material and the non-transparent resin material is not particularly limited.
[0026]
It is preferable that the softening of the contact surface is performed by irradiation of a preheating laser beam. By irradiating the preheating laser beam, at least the contact surface portion of the non-transparent resin material can be softened.
[0027]
The preheating laser is preferably applied in a state where the transparent resin material and the non-transparent resin material are pressed against each other. In other words, the pre-heating laser light is irradiated in a state where the transparent resin material and the non-transparent resin material are welded and pressed together, so that the laser welding can be performed after softening by the pre-heating laser light. The thermal energy accumulated in the non-transparent resin material can be used for laser welding. Furthermore, there is no movement of the resin material whose contact surface has been softened, so that deformation of the contact surface of the resin material is less likely to occur, and a decrease in dimensional accuracy is suppressed.
[0028]
Note that the preheating laser light is not limited as long as the laser light can soften the irradiated resin material. That is, either laser light generated from a laser generation source that generates laser light to be irradiated at the time of laser welding or laser light generated from a different laser generation source may be used. Here, when the preheating laser and the laser beam irradiated at the time of laser welding are laser beams emitted from the same laser source, the output and irradiation time of the laser beam are changed to change the preheating laser beam. Welding does not occur during irradiation.
[0029]
It is preferable that the softening of the contact surface is performed by contacting the heating member with the contact surface. By bringing the heating member into contact with the contact surface portion, heat from the heating member is conducted to the contact surface portion, and the contact surface portion is softened by the heat. In the heating by the heating member, since the distance from the contact surface is substantially proportional to the temperature of the resin material, it is possible to suppress the occurrence of uneven heating when the shape of the contact surface is complicated.
[0030]
The heating member is not particularly limited as long as it is a member that can conduct heat to the contact surface when it contacts the contact surface. For example, a heated member or the like can be given.
[0031]
The softening of the contact surface is preferably performed by blowing warm air on the contact surface. By blowing the hot air, the contact surface can be softened easily and inexpensively.
[0032]
It is preferable that the softening of the contact surface portion is achieved by heating the conductive resin material and / or the non-transmissive resin material by electromagnetic induction in the contact surface portion in which the conductor is dispersed.
[0033]
In the welding method of the present invention, the type of resin used for the non-transparent resin material is not particularly limited as long as it has thermoplasticity and can absorb laser light as a heating source without transmitting the laser light. For example, polyamide (PA) such as nylon 6 (PA6) or nylon 66 (PA66), polyethylene (PE), polypropylene (PP), styrene-acrylonitrile copolymer, polyethylene terephthalate (PET), polystyrene, ABS, acrylic (PMMA) ), Polycarbonate (PC), polybutylene terephthalate (PBT), PPS and the like, and a predetermined coloring material such as carbon black, a dye or a pigment mixed therein. In addition, what added reinforcing fibers, such as glass fiber and carbon fiber, may be used as needed.
[0034]
The type of resin used for the transparent resin material is not particularly limited as long as it has thermoplasticity and can transmit laser light as a heating source. For example, polyamide (PA) such as nylon 6 (PA6) or nylon 66 (PA66), polyethylene (PE), polypropylene (PP), styrene-acrylonitrile copolymer, polyethylene terephthalate (PET), polystyrene, ABS, acrylic (PMMA) ), Polycarbonate (PC), polybutylene terephthalate (PBT) and the like. If necessary, a reinforcing fiber such as glass fiber or carbon fiber or a coloring material may be used.
[0035]
Further, the combination of resins used for the permeable resin material, the non-permeable resin material, and the elastic material is preferably a combination of mutually compatible materials. Examples of such a combination include a combination of resins of the same kind, such as nylon 6 and nylon 66, a combination of nylon 6 and nylon 66, a combination of PET and PC, a combination of PC and PBT, and the like. be able to.
[0036]
In the welding method of the present invention, the type of the laser light applied to the contact interface may be appropriately selected and used in relation to the absorption spectrum and the plate thickness (transmission length) of the transparent resin material that transmits the laser light. it can. For example, Glass: neodymium 3+ laser, YAG: Nd 3+ laser, ruby laser, a helium - neon laser, krypton laser, argon laser, H 2 laser, N 2 laser, it is possible to increase the laser light of the semiconductor laser. More preferable lasers include a YAG: neodymium 3+ laser (wavelength of laser light: 1060 nm) and a semiconductor laser (wavelength of laser light: 500 to 1000 nm).
[0037]
The output of the laser beam is preferably 50 to 900 W. If the output of the laser beam is less than 50 W, the output is low and it is difficult to melt the contact surfaces of the resin materials. If the output exceeds 900 W, the output becomes excessive and the resin material evaporates or deteriorates. become.
[0038]
In the laser welding method of the resin member of the present invention, the laser welding is performed in a state where the contact surface is softened in advance. Irradiation can be performed. That is, no gap remains at the contact interface between the permeable resin material and the non-permeable resin material of the welded resin member. As a result, according to the laser welding method for a resin member of the present invention, it is possible to manufacture a resin member that suppresses the occurrence of poor welding and has excellent leak resistance at the welded portion by laser welding.
[0039]
【Example】
Hereinafter, the present invention will be described using examples.
[0040]
As an example of the present invention, laser welding of a permeable resin material and a non-permeable resin material was performed.
[0041]
(Example 1)
In this example, a test piece made of a permeable resin and a test piece made of an impermeable resin and integrally formed with an elastic material were formed, and both test pieces were welded by laser welding. This embodiment is shown in FIG.
[0042]
First, a test piece 1 made of a non-permeable resin was formed. The test piece 1 made of a non-permeable resin is obtained by mixing carbon black and a coloring material into a nylon 6 glass reinforcing material. The non-transmissive resin material 1 is made to absorb laser light by mixing carbon black and a coloring material.
[0043]
Subsequently, a test piece 2 made of a permeable resin was formed. The test piece 1 made of a permeable resin is made of a nylon 6 glass reinforced material.
[0044]
Then, both test pieces 1 and 2 were pressed. In a state where both test pieces 1 and 2 were pressed against each other, a preheating laser beam 3 emitted from a laser head was applied to the contact interface of both test pieces 1 and 2 so as to scan along the contact interface. The irradiated preheated laser beam 3 passed through the test piece 2 and reached the surface of the test piece 1 and was absorbed. Then, the preheating laser light absorbed in the test piece 1 is stored as energy. As a result, the contact surface of the test piece 1 was heated and softened.
[0045]
Since the two test pieces 1 and 2 are in pressure contact with each other, if a gap exists at the contact interface between the two test pieces 1 and 2, the softened contact surface portion of the test piece 1 undergoes plastic deformation, and this gap is formed. Filled with test piece 1.
[0046]
With the gap between the two test pieces 1 and 2 filled, a laser beam 4 emitted from a laser head was applied to the contact interface between the test pieces 1 and 2 so as to scan along the contact interface. . The irradiated laser light 4 passed through the test piece 2 and reached the surface of the test piece 1 and was absorbed. Then, the laser light absorbed by the test piece 1 is stored as energy. As a result, the contact surface portion of the test piece 1 is heated and melted, and the contact surface of the test piece 2 is heated and melted by heat transfer from the contact surface of the test piece 1. And since both test pieces 1 and 2 were pressed, the test pieces 1 and 2 were integrally joined.
[0047]
The laser beam used for laser welding in this example was a semiconductor laser having a wavelength of 940 nm, an output of 50 to 900 W, and a processing speed of 0.5 to 5 m / min. The preheating laser beam was applied at a lower output than the laser beam described above. The laser beam for laser welding and the preheating laser beam are both light beams emitted from a semiconductor laser. In this embodiment, both laser beams are emitted from different laser heads.
[0048]
Since the laser welding of the present embodiment is performed in a state where the gap between the two test pieces 1 and 2 is filled, the gap between the welded portions of the two test pieces 1 and 2 is eliminated. That is, the generation of the leak caused by the gap between the welded portions does not occur. Further, both test pieces 1 and 2 could be welded with sufficient welding strength.
[0049]
As described above, in the present example, poor welding and leakage do not occur in the welded portions of the test pieces 1 and 2.
[0050]
(Example 2)
First, test pieces 1 and 2 similar to those in Example 1 were formed.
[0051]
The contact surfaces of both molded test pieces 1 and 2 were brought into contact with the hot plate 5. Due to the contact between the hot plate 5 and the test pieces 1 and 2, the contact surfaces of the test pieces 1 and 2 were softened.
[0052]
Then, both test pieces 1 and 2 were immediately pressed against each other, and the contact surfaces of both test pieces 1 and 2 were brought into close contact with each other. Due to the close contact between the contact surfaces, the gap between the two test pieces 1 and 2 was filled. Specifically, even if the contact surface has irregularities, the resin forming the contact surface portion is plastically deformed by the close contact in a softened state, and the irregularities disappear.
[0053]
With the gap between the two test pieces 1 and 2 filled, a laser beam 4 emitted from a laser head was applied to the contact interface between the test pieces 1 and 2 so as to scan along the contact interface. . The irradiated laser light 4 passed through the test piece 2 and reached the surface of the test piece 1 and was absorbed. Then, the laser light absorbed by the test piece 1 is stored as energy. As a result, the contact surface portion of the test piece 1 is heated and melted, and the contact surface of the test piece 2 is heated and melted by heat transfer from the contact surface of the test piece 1. And since both test pieces 1 and 2 were pressed, the test pieces 1 and 2 were integrally joined.
[0054]
In this embodiment, the laser beam applied to the contact interface is the same as that in the first embodiment.
[0055]
Since the laser welding of the present embodiment is performed in a state where the gap between the two test pieces 1 and 2 is filled, the gap between the welded portions of the two test pieces 1 and 2 is eliminated. That is, the generation of the leak caused by the gap between the welded portions does not occur. Further, both test pieces 1 and 2 could be welded with sufficient welding strength.
[0056]
As described above, in the present example, poor welding and leakage do not occur in the welded portions of the test pieces 1 and 2.
[0057]
【The invention's effect】
In the laser welding method of the resin member of the present invention, the laser welding is performed in a state where the contact surface is softened in advance. Irradiation can be performed. That is, no gap remains at the contact interface between the permeable resin material and the non-permeable resin material of the welded resin member. As a result, according to the laser welding method for a resin member of the present invention, it is possible to manufacture a resin member that suppresses the occurrence of poor welding and has excellent leak resistance at the welded portion by laser welding.
[Brief description of the drawings]
FIG. 1 is a view showing laser welding of Example 1.
FIG. 2 is a view showing laser welding of Example 2.
FIG. 3 is a diagram illustrating a relationship between a gap amount of a contact surface of a resin member and welding strength.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Test piece made of non-permeable resin material 2 ... Test piece made of transparent resin material 3 ... Preheating laser beam 4 ... Laser beam 5 ... Hot plate

Claims (5)

加熱源としてのレーザー光に対して透過性のある透過樹脂よりなる透過樹脂材と、該レーザー光に対して透過性のない非透過樹脂よりなる非透過樹脂材との当接界面を、該透過樹脂材側からの該レーザー光の照射により加熱溶融させて溶着する樹脂部材のレーザー溶着方法であって、
該透過樹脂材および該非透過樹脂材の該当接界面を形成する当接面部の少なくとも一方が加熱されて軟化し、かつ該透過樹脂材および該非透過樹脂材が圧接した状態で該レーザー光が照射されることを特徴とする樹脂部材のレーザー溶着方法。The contact interface between a transparent resin material made of a transparent resin that is transparent to laser light as a heating source and a non-transparent resin material made of a non-transparent resin that is not transparent to the laser light, A laser welding method for a resin member that is heated and melted and welded by irradiation of the laser light from the resin material side,
At least one of the contact surfaces forming the corresponding contact interface between the transparent resin material and the non-transparent resin material is heated and softened, and the laser light is irradiated in a state where the transparent resin material and the non-transparent resin material are pressed against each other. A laser welding method for a resin member. 前記当接面部の軟化は、予備加熱レーザー光の照射によりなされた請求項１記載の樹脂部材のレーザー溶着方法。The laser welding method for a resin member according to claim 1, wherein the softening of the contact surface portion is performed by irradiation of a preheating laser beam. 前記予備加熱レーザー光は、前記透過樹脂材と前記非透過樹脂材との当接界面に該透過樹脂材側から照射される請求項２記載の樹脂部材のレーザー溶着方法。The laser welding method for a resin member according to claim 2, wherein the preheating laser beam is applied to a contact interface between the transmission resin material and the non-transmission resin material from the transmission resin material side. 前記当接面部の軟化は、該当接面部に加熱部材を当接してなされた請求項１記載の樹脂部材のレーザー溶着方法。The laser welding method for a resin member according to claim 1, wherein the softening of the contact surface portion is performed by bringing a heating member into contact with the contact surface portion. 前記当接面部の軟化は、該当接面部に温風を吹き付けてなされた請求項１記載の樹脂部材のレーザー溶着方法。The laser welding method for a resin member according to claim 1, wherein the softening of the contact surface portion is performed by blowing hot air to the contact surface portion.
JP2002359870A 2002-12-11 2002-12-11 Laser welding method of resin member Pending JP2004188802A (en)

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Cited By (9)

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JP2006512221A (en) * 2002-12-27 2006-04-13 ラーザークイップメント アーゲー Method and apparatus for welding thermoplastic moldings, in particular contour welding of three-dimensional moldings
JP2006205441A (en) * 2005-01-26 2006-08-10 Koito Mfg Co Ltd Manufacturing method of lamp device for vehicle
WO2006093059A1 (en) * 2005-03-02 2006-09-08 Toyota Jidosha Kabushiki Kaisha Gas container and method of producing the same
JP2007111931A (en) * 2005-10-19 2007-05-10 Toyota Motor Corp Laser welding method of thermoplastic resin members and laser welding apparatus
JP2007182003A (en) * 2006-01-10 2007-07-19 Stanley Electric Co Ltd Laser welding method for resin material
JP2008213156A (en) * 2007-02-28 2008-09-18 Osaka Univ Metal resin jointing method using plurality of laser beam sources and metal resin composite
JP2009291998A (en) * 2008-06-04 2009-12-17 Toyota Motor Corp Laser resin fusion method and laser resin fusion device
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006512221A (en) * 2002-12-27 2006-04-13 ラーザークイップメント アーゲー Method and apparatus for welding thermoplastic moldings, in particular contour welding of three-dimensional moldings
JP2006205441A (en) * 2005-01-26 2006-08-10 Koito Mfg Co Ltd Manufacturing method of lamp device for vehicle
JP4678829B2 (en) * 2005-01-26 2011-04-27 株式会社小糸製作所 Manufacturing method of vehicular lamp
EP1855046A4 (en) * 2005-03-02 2009-04-15 Toyota Motor Co Ltd Gas container and method of producing the same
WO2006093059A1 (en) * 2005-03-02 2006-09-08 Toyota Jidosha Kabushiki Kaisha Gas container and method of producing the same
US7943884B2 (en) 2005-03-02 2011-05-17 Toyota Jidosha Kabushiki Kaisha Gas container and method of producing the same
EP1855046A1 (en) * 2005-03-02 2007-11-14 Toyota Jidosha Kabushiki Kaisha Gas container and method of producing the same
KR100783676B1 (en) 2005-10-19 2007-12-07 도요다 지도샤 가부시끼가이샤 Method and apparatus for laser welding thermoplastic resin members
JP2007111931A (en) * 2005-10-19 2007-05-10 Toyota Motor Corp Laser welding method of thermoplastic resin members and laser welding apparatus
JP2007182003A (en) * 2006-01-10 2007-07-19 Stanley Electric Co Ltd Laser welding method for resin material
JP2008213156A (en) * 2007-02-28 2008-09-18 Osaka Univ Metal resin jointing method using plurality of laser beam sources and metal resin composite
JP2009291998A (en) * 2008-06-04 2009-12-17 Toyota Motor Corp Laser resin fusion method and laser resin fusion device
EP2962804A3 (en) * 2014-04-17 2016-03-02 Primoceler Oy Method of welding two substrate pieces together using a focused laser beam
US9636780B2 (en) 2014-04-17 2017-05-02 Primoceler Oy Method to weld two substrate pieces together using a focused laser beam
DE112020007121T5 (en) 2020-04-27 2023-03-23 Mitsubishi Electric Corporation Connection structure of resin members, resin cases for electrical equipments and laser welding processes

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