CN106313519A - Method for improving laser transmission welding strength - Google Patents

Method for improving laser transmission welding strength Download PDF

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Publication number
CN106313519A
CN106313519A CN201610681491.XA CN201610681491A CN106313519A CN 106313519 A CN106313519 A CN 106313519A CN 201610681491 A CN201610681491 A CN 201610681491A CN 106313519 A CN106313519 A CN 106313519A
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China
Prior art keywords
workpiece
thin film
laser transmission
transmission welding
lower workpiece
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Pending
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CN201610681491.XA
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Chinese (zh)
Inventor
王霄
仲雪娇
刘会霞
刘伟
刘保光
姜英杰
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Jiangsu University
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Jiangsu University
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Priority to CN201610681491.XA priority Critical patent/CN106313519A/en
Publication of CN106313519A publication Critical patent/CN106313519A/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
    • 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
    • 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
    • B29C65/022—Particular heating or welding methods not otherwise provided for
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces 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
    • B29C66/01—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
    • B29C66/022—Mechanical pre-treatments, e.g. reshaping
    • B29C66/0222—Mechanical pre-treatments, e.g. reshaping without removal of material, e.g. cleaning by air blowing or using brushes
    • 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
    • B29C66/40—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
    • B29C66/45—Joining of substantially the whole surface of the 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
    • B29C66/71—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
    • B29C66/71—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
    • B29C66/712—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 the composition of one of the parts to be joined being different from the composition of the other part
    • 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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. 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
    • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
    • B29K2033/04—Polymers of esters
    • B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/006—PBT, i.e. polybutylene terephthalate

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

Abstract

The invention discloses a method for improving laser transmission welding strength, and belongs to the technical field of laser transmission welding. The method comprises a base, a lower workpiece, a film, an upper workpiece and a laser emitter; the lower workpiece is put on the base; the film is put on the lower workpiece; the upper workpiece is put on the film; the laser emitter is arranged above the upper workpiece; and the lower workpiece, the film and the upper workpiece are all polymer materials. The method uses the film material with better compatibility for two materials for improving the laser transmission welding strength between different polymers with weaker compatibility.

Description

A kind of method improving laser transmission welding intensity
Technical field
The invention belongs to laser transmission welding technical field, refer more particularly to a kind of side improving laser transmission welding intensity Method.
Background technology
Plastic have lightweight, intensity is high, density is low, low cost, excellent spring, the advantage such as corrosion-resistant, therefore mould Material application is more and more extensive, especially thermoplastic.Most of thermoplastic articles are all mechanograph, are added by injection, extrusion molding Many impacts such as work technique and Mold Making, plastic the most in irregular shape or baroque is difficult to once be molded Molding, method the most most economical, effective is to be combined by multiple simple mouldings, therefore, occurs in that various The method of attachment of thermoplastic.Traditional mechanical joining methods due to easy damaged components and parts, connect insecure and exotic The shortcomings such as the introducing of matter and can not get being widely used.Laser transmission welding has many excellent compared to traditional welding method Point, such as, forms weld seam accurate, firm, that seal；Easily controllable, automated production can be realized；Welding heat affected zone is little；Weldering Connecing speed fast, quality is high, and weld seam is positioned at material interface；Welded stress and vibration stress are little；It is capable of foreign material Welding, is the most potential welding method between current thermoplastic and between thermoplastic and metal.
At present, the material of laser transmission welding is mainly the preferable material of the compatibility, and for the poor xenogenesis of the compatibility Material, seldom can be welded together by laser transmission welding.Wherein, solution has: such as document " Study on Welding Mechanism Based on Modification of Polypropylene for Improving the Laser Transmission Weldability to PA66 " in mention with maleic anhydride, polypropylene is carried out graft modification and improves Welding performance between polypropylene and nylon66 fiber, and find that weld strength is greatly improved, but this kind of method can change certain of material A little performances, and welding cost is high；Or such as document " Performance and mechanism of laser Transmission joining between glass fiber-reinforced PA66 and PC " in mention GFR- PA66 Yu PC compatibility difference is big, and not directly Welding Problems coats one layer of 20 μ by cold spray technique on GFR-PA66 M thickness Al thin layer carrys out the poor PC of the compatibility therewith as subsurface material and carries out laser transmission welding, found that weld strength energy Reaching about 4MPa, the shortcoming of this kind of method is that professional technique requires height, and cost is high, is not suitable for large-scale production.
Laser transmission welding technology is the trend of future development, but it also faces a great problem: poor different of the compatibility Plant the welding between material.So such issues that solve in the urgent need to a kind of not only economy but also a kind of practical method.
Summary of the invention
The problem existed for laser transmission welding dissimilar polymer in prior art, between upper workpiece and lower workpiece The situation that the compatibility is poor, by using the thin-film material between a kind of energy and upper workpiece and lower workpiece with the preferable compatibility, Improve the laser transmission welding intensity between the dissimilar polymer that the compatibility is poor.
The present invention is realized by techniques below means:
A kind of method improving laser transmission welding intensity, comprises the steps:
S1, lower workpiece, thin film and upper workpiece ethanol are carried out ultrasonic waves for cleaning, remove its surface impurity, be put in afterwards 6～24h it are dried in drying baker；Wherein, lower workpiece, thin film and upper workpiece are polymeric material；
S2, by through step S1 process after lower workpiece, thin film and upper workpiece be positioned over the most from top to bottom on pedestal, so Rear transparent glass is positioned on workpiece, by transparent glass applies pressure, and then applies upper workpiece, thin film and lower workpiece Pressure；
S3, open generating laser, laser beam by laser transmitter projects out after, through transparent glass, upper workpiece With the upper surface of thin film to lower workpiece, the energy of laser beam is converted into heat energy after being absorbed by the upper surface of lower workpiece so that under The upper surface of workpiece, thin film and the fusing of upper workpiece lower surface, under the effect of the pressure, spread between strand, wriggle, twine After the range of motion such as knot, molecular entanglement together, forms Van der Waals force, i.e. forms firm weld seam between material.
Further, upper workpiece is equipped with transparent glass.
Further, transparent glass is K9 glass.
Further, film thickness is 0.01mm～0.5mm.
Further, thin film respectively and upper workpiece and the lower workpiece compatibility be all higher than between workpiece and lower workpiece compatible Property；Film thickness is 0.01mm～0.5mm.
Thin film all has the preferable compatibility with upper workpiece and lower workpiece, and thin film is transparent PC.
Further, lower workpiece is the light absorbent PBT added with carbon black.
Further, upper workpiece is transparent material PMMA.
The invention has the beneficial effects as follows:
1. the present invention uses laser to be energy source, for, when between upper workpiece and lower workpiece, the compatibility is poor, passing through Use the thin-film material between a kind of energy and upper workpiece and lower workpiece with the preferable compatibility, improve the xenogenesis that the compatibility is poor Laser transmission welding intensity between polymer.
2., in the course of processing, the energy of laser beam is converted into heat energy after being absorbed by the upper surface of lower workpiece so that under The upper surface of workpiece, thin film and the fusing of upper workpiece lower surface, under the effect of the pressure, spread between strand, wriggle, twine After the range of motion such as knot, molecular entanglement together, forms Van der Waals force, i.e. forms firm weld seam between material.
3. going up workpiece selects transparent material PMMA, the choosing of lower workpiece added with the light absorbent PBT of carbon black, so to play the extinction of workpiece Effect improves, thus improves welding effect.
4. thin film all has the preferable compatibility with upper workpiece and lower workpiece；It is unfavorable for lower workpiece it addition, thin film is the thickest The lower surface of the upper workpiece of the heat absorbed transmission of upper surface, thin film is the thinnest, does not has compatible effect, so selecting thin film Thickness is 0.01mm～0.5mm.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of method improving laser transmission welding intensity of the present invention；
Fig. 2 be in the present invention welding after weldment schematic diagram.
Reference is as follows:
1-pedestal；Workpiece under 2-；3-thin film；The upper workpiece of 4-；5-transparent glass；6-pressure；7-laser beam；8-laser is sent out Emitter；9-molten bath.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to This.
By using the thin-film material between a kind of energy and upper workpiece and lower workpiece with the preferable compatibility to improve compatible Laser transmission welding intensity between the dissimilar polymer that property is poor.
A kind of method improving laser transmission welding intensity, comprises the steps:
S1, lower workpiece 2, thin film 3 and upper workpiece 4 ethanol are carried out ultrasonic waves for cleaning, remove its surface impurity, put afterwards 6～24h it are dried in drying baker；
S2, by through step S1 process after lower workpiece 2, thin film 3 and upper workpiece 4 be positioned over pedestal 1 the most from top to bottom On, then transparent glass 5 is positioned on workpiece 4, by transparent glass 5 applies pressure 6, and then to upper workpiece 4, thin film 3 Pressure is applied with lower workpiece 2；
S3, open generating laser 8, after laser beam 7 is emitted by generating laser 8, through transparent glass 5, on Workpiece 4 and thin film 3 arrive the upper surface of lower workpiece 2, and the energy of laser beam 7 is converted into heat after being absorbed by the upper surface of lower workpiece 2 Can so that the upper surface of lower workpiece 2, thin film 3 and the fusing of upper workpiece 4 lower surface, make to spread between strand, wriggle, twine After the range of motion such as knot, molecular entanglement together, under the effect of the pressure, forms Van der Waals force, i.e. shape between material Become firm weld seam.Wherein, transparent glass is K9 glass；Film thickness is 0.01mm～0.5mm；Thin film 3 is transparent PC, upper work Part 4 is the preferable polymeric material of light transmission, and lower workpiece 2 is the light absorbent PBT added with carbon black；Upper workpiece 4 is transparent material PMMA。
The present invention welds selected material: upper workpiece 4 is transparent material PMMA (size 20mm × 20mm × 1.5mm), adds There is the light absorbent PBT (size 20mm × 20mm × 1.5mm) of carbon black as lower workpiece 2, transparent material PC (size 20mm × 20mm × 0.125mm) as thin film 3.
Wherein, PMMA full name is polymethyl methacrylate (polymethyl methacrylate)；PBT full name is Polybutylene terephthalate (polybutylene terephthalate (PBT))；PC full name is Polycarbonate (poly-carbonic acid Ester).
The intermiscibility of PMMA with PBT is poor, and the intensity by laser transmission welding is relatively low, PC material and both compatibilitys Preferable.
Method of work:
S1, PMMA, PC, PBT ethanol is carried out ultrasonic waves for cleaning, remove its surface impurity, be put in afterwards in drying baker It is dried 12h；
S2, PBT, PC and PMMA are sequentially placed on pedestal, K9 glass are positioned on PMMA, by K9 glass is executed Plus-pressure, and then upper workpiece, thin film and lower workpiece are applied pressure；
S3, open generating laser, laser power be set to 18W, laser beam by laser transmitter projects out after, thoroughly Crossing K9 glass, the upper surface of PMMA and PC thin film arrival PBT, the energy of laser beam is converted into after being absorbed by the upper surface of PBT Heat energy, melts the upper surface of PBT, PC thin film and PMMA lower surface, under the effect of the pressure, forms Van der Waals between material Power, i.e. forms molten bath 9 thus forms firm weld seam.
Described embodiment be the present invention preferred embodiment, but the present invention is not limited to above-mentioned embodiment, not In the case of deviating from the flesh and blood of the present invention, any conspicuously improved, the replacement that those skilled in the art can make Or modification belongs to protection scope of the present invention.

Claims (7)

1. the method improving laser transmission welding intensity, it is characterised in that: comprise the steps:
S1, lower workpiece (2), thin film (3) and upper workpiece (4) are carried out ultrasonic waves for cleaning with ethanol, remove its surface impurity, afterwards It is dried 6～24h in being put in drying baker；Wherein, lower workpiece (2), thin film (3) and upper workpiece (4) are polymeric material；
S2, by through step S1 process after lower workpiece (2), thin film (3) and upper workpiece (4) be positioned over pedestal the most from top to bottom (1) on, then transparent glass (5) is positioned on workpiece (4), by transparent glass (5) is applied pressure (6), and then to upper Workpiece (4), thin film (3) and lower workpiece (2) apply pressure；
S3, open generating laser (8), after laser beam (7) is emitted by generating laser (8), through transparent glass (5), the upper surface of upper workpiece (4) and thin film (3) to lower workpiece (2), the energy of laser beam (7) is by the upper table of lower workpiece (2) Face is converted into heat energy after absorbing so that the upper surface of lower workpiece (2), thin film (3) and the fusing of upper workpiece (4) lower surface, at pressure Effect under, spread between strand, wriggle, after the range of motion such as entanglement, molecular entanglement together, material it Between formed Van der Waals force, i.e. form firm weld seam.
The method of raising laser transmission welding intensity the most according to claim 1, it is characterised in that: described upper workpiece (4) On be equipped with transparent glass (5).
The method of raising laser transmission welding intensity the most according to claim 2, it is characterised in that: described transparent glass (5) it is K9 glass.
The method of raising laser transmission welding intensity the most according to claim 1, it is characterised in that: described thin film (3) point Not and upper workpiece (4) and lower workpiece (2) compatibility are all higher than the compatibility between workpiece (4) and lower workpiece (2)；Described thin film (3) thickness is 0.01mm～0.5mm.
5. according to the method improving laser transmission welding intensity described in any one of Claims 1-4, it is characterised in that: described Thin film (3) is transparent PC.
The method of raising laser transmission welding intensity the most according to claim 1, it is characterised in that: described lower workpiece (2) For the light absorbent PBT added with carbon black.
7. according to the method improving laser transmission welding intensity described in any one of Claims 1-4, it is characterised in that: described Upper workpiece (4) is transparent material PMMA.
CN201610681491.XA 2016-08-17 2016-08-17 Method for improving laser transmission welding strength Pending CN106313519A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107414295A (en) * 2017-08-15 2017-12-01 大族激光科技产业集团股份有限公司 A kind of watchband and its processing method and device
CN108687442A (en) * 2017-03-30 2018-10-23 法拉第未来公司 system and method for welding

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US20040056006A1 (en) * 1998-10-01 2004-03-25 The Welding Institute Welding method
CN1923897A (en) * 2005-09-01 2007-03-07 东方化学工业株式会社 Laser ray transmitting colored resin composition and related technique
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Application publication date: 20170111