JP5194629B2 - Joining method of thermoplastic resin material and metal material - Google Patents

Description

  The present invention relates to a laser welding joining method between a metal material and a thermoplastic resin material. In order to increase the bonding strength between metal material and thermoplastic resin material, the method of bonding metal material and thermoplastic resin material with excellent welding and bonding characteristics by examining the adhesion of both materials and optimizing the laser irradiation conditions About.

    As a conventional method used for joining a metal material and a resin material, there are a rivet fastening method and a joining method using an adhesive. The rivet fastening method is a physical fastening method in which a rivet having a diameter of several millimeters to several tens of millimeters is driven and fixed so as to penetrate a metal material and a resin material. On the other hand, the adhesive is a method of fixing a metal material and a resin material by physical adsorption force and chemical adsorption force via an adhesive.

  However, these methods require a third material such as a rivet or an adhesive. In the case of a rivet, the joining part is heavy and bulky, so it is inevitable to increase the size and weight of the joining part, and design freedom There is a disadvantage that the degree is lowered. In the case of adhesives, there are many work processes, the working environment is bad, and there is a problem of environmental pollution. In addition, it is necessary to fix the joint surface for a long time until the adhesive is effective. Therefore, the field of application of bonding methods using rivets and adhesives is extremely limited.

On the other hand, in recent years, a method of joining using a laser has been developed, and a combination of a resin that transmits a laser and a resin that absorbs a laser has been put into practical use as a method for joining resin materials. However, there are various problems with the method of joining metal materials and thermoplastic resin materials, especially thermoplastic elastomer materials that are soft and easily deformed, and thermoplastic resin materials that contain thermoplastic elastomers by laser irradiation. No law has been found.
Furthermore, in order to join a thermoplastic resin material and a metal material by laser irradiation, laser irradiation with a high output of 100 W or more is generally required, and it is difficult to find conditions suitable for welding, and the cost of laser equipment is high. There was a problem that it was expensive and difficult to maintain and manage.

Therefore, the present invention examines a joining method between a metal material, which has been difficult to weld by laser, and a thermoplastic elastomer material that is soft and easily deformed, and welds even a curved surface in a short time by irradiating laser light. It is an object of the present invention to provide a method for joining a metal material and a thermoplastic resin material that can be used.
Furthermore, it is an object of the present invention to provide a laser with a low output and a wide range of conditions for welding and joining a thermoplastic resin material and a metal material.

  As a result of diligent research to solve the above-mentioned problems, the present inventors have studied a method for preventing the thermoplastic resin material from being deformed by the initial heat generation during the laser irradiation to deteriorate the adhesion to the metal material. The inventors have found that the metal material and the thermoplastic resin material can be welded and joined, and that the above object can be achieved, and the present invention has been completed.

That is, the present invention is (1) in joining a thermoplastic resin material and a metal material, a thermoplastic film compatible with the thermoplastic resin material is interposed at the joining interface, and the metal material is heated by irradiating laser light. A method for joining a thermoplastic resin material and a metal material, characterized in that the film is melted and welded.
(2) The method for joining a thermoplastic resin material and a metal material according to (1), wherein the thermoplastic resin material is a polyester-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, and an olefin-based thermoplastic elastomer.
(3) The method for joining a thermoplastic resin material and a metal material according to (1), wherein the thermoplastic resin material is a polyester resin or a polyamide resin.

According to the present invention, a metal material and a thermoplastic elastomer material could not be joined by using a laser light source until now, but by interposing a film made of a thermoplastic resin compatible with the thermoplastic resin material of the present invention. It has become possible to weld and bond a metal material and a thermoplastic elastomer material.
Furthermore, the laser irradiation conditions for joining the thermoplastic resin material and the metal material were lower in output and the condition range could be expanded.
Also, by using a laser light source, local bonding, pinpoint bonding, free curve bonding, and the like can be quickly and inexpensively manufactured. Therefore, it is important to contribute to the industry.

The present invention will be described in detail below. Metal materials in the present invention include various steel materials that are iron alloys, copper alloys, titanium and its alloys, and light metal alloys centered on aluminum, magnesium, and the like. Yes, but not limited to these. Particularly preferred metal materials are stainless steel alloys and aluminum alloys.

The thermoplastic elastomer (hereinafter referred to as TPE) in the present invention is an elastic material that does not need to be vulcanized like rubber and is generally composed of a hard component (hard and rigid component) and a soft component (soft and flexible component). Material. There are many types of TPE, and examples of TPE used in the present invention include olefin-based TPE, styrene-based TPE, polyester-based TPE, and urethane-based TPE.

The olefinic TPE includes a dynamic vulcanization type, a blend type, and a polymerization type, but any olefinic TPE can be used. The constituent components of olefinic TPE include polypropylene resins and polyethylene resins as hard components, ethylene / propylene copolymers, ethylene / propylene / gen copolymers (EPDM), butyl rubber (IIR) and soft components as soft components. It is composed of an ethylene copolymer and the like.
Specific examples of styrene TPE include styrene / butadiene / styrene block copolymer (SBS), styrene / isoprene / styrene block copolymer (SIS), and styrene / ethylene / butylene / styrene block copolymer (SEBS). ), Styrene / ethylene / propylene / amylene / styrene block copolymer (vinyl SEPS), styrene / butadiene copolymer (HSBR) which is a hydrogenated product of styrene / butadiene copolymer, polyester-based TPE As the hard component, polyethylene terephthalate, polybutylene terephthalate, polynaphthalene terephthalate or the like can be used as the hard component, and TPE composed of polytetramethylene glycol, ε-caprolactone, or the like can be used as the soft component.
There are many types of polyurethane-based TPE, such as polyester type and polyether type. Any type of polyurethane-based TPE can be used. Polyamide-based TPE includes nylon 12, naolon 11, nylon 6, etc. as hard components As a soft component, it is composed of a polyether such as polytetramethylene glycol and a polyester such as ε-caprolactone.

Among these TPEs, particularly preferred are olefinic TPE, polyester TPE and polyamide TPE which are excellent in heat resistance and thermal stability.
The hardness of TPE in the present invention is 50 degrees for Shower A to 75 degrees for Shower D. Below 50 degrees of Shower A, the heat resistance and thermal stability of TPE are inferior, which is not preferable. On the other hand, TPE of Shower D of 75 degrees or more is not preferable because it becomes hard and lacks flexibility as an original TPE.

The polyester resin material in the present invention is a polymer having an ester bond (—COO—) in the main chain. Of course, a reinforcing material, a filler, and other components can be contained within a range not impairing the object of the present invention.
Specifically, polyester is a general term for polymers obtained by polycondensation of polybasic acid (generally dicarboxylic acid) and polyhydric alcohol. As more specific constituent components of the polyester, the following polyvalent carboxylic acids, or alkyl esters or acid anhydrides thereof can be used. Examples of the polyvalent carboxylic acid include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, and 2,2′-diphenyl. Aromatic dicarboxylic acids such as dicarboxylic acid, 4,4′-diphenyl ether dicarboxylic acid, 5-sulfonic acid sodium isophthalic acid, 5-hydroxyisophthalic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, Sebacic acid, 1,12-dodecanedioic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, dimer acid, etc. Aliphatic and alicyclic dicarboxylic acids, trimellitic acid, pyromellitic acid Acid, benzophenonetetracarboxylic acid, biphenyltetracarboxylic acid, ethylene glycol bis (anhydrotrimellitate), and aromatic polycarboxylic acids, such as glycerol tris (anhydrotrimellitate) and the like. Examples of the polyol component of the polyester include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-butanediol, 1,3. -Butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, dipropylene glycol 2,2,4-trimethyl-1,5-pentanediol, neopentylhydroxypivalate, bisphenol A ethylene oxide adduct and propylene oxide adduct, hydrogenated bisphenol A ethylene oxide adduct And propylene oxide adduct, 1,9- Nandiol, 2-methyloctanediol, 1,10-decanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,4-cyclohexanedimethanol, tricyclodecane dimethanol, dimer diol, polycarbonate glycol, Examples thereof include glycerin, trimethylolpropane, pentaerythritol, dimethylolbutanoic acid, dimethylolpropionic acid, polycarbonate diol, and polyether glycol. Polyether glycols include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol, and copolymers thereof. Furthermore, diols such as neopentyl glycol and bisphenol A, diphenols, and the like are co-polymerized with these alkylene glycols. The polymerized ones also apply. The number average molecular weight of the polyether glycol is preferably 400 to 10,000. A preferred lower limit is 600, more preferably 800. Furthermore, lactones such as ε-caprolactone, δ-valerolactone, β-methyl-δ-valerolactone, β-propiolactone, γ-butyrolactone, lactic acid, glycolic acid, 2-hydroxyisobutanoic acid, 3-hydroxybutane Examples thereof include hydroxycarboxylic acids such as acids, 4-hydroxybutanoic acid and 6-hydroxycaproic acid and cyclic dimers thereof. Among these, crystalline polyesters such as polyarylate, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and the like are copolymerized with cyclohexanedimethanol, neopentyl glycol, isophthalic acid, etc. A resin whose crystallinity is lowered or amorphous is preferred.

The polyamide-based resin of the present invention has an amide bond (—CONH—) in the molecule, and ε-caprolactam, 6-aminocaproic acid, ω-enantolactam, 7-aminoheptanoic acid, 11-aminoundecanoic acid, A polymer or copolymer obtained from 9-aminononanoic acid, α-pyrrolidone, α-piperidine, lauryl lactam, or a blend thereof. Hexamethylenediamine, nanomethylenediamine, undecamethylenediamine, dodecamethylenediamine, metaxylylenediamine, trimethylhexamethylenediamine and other diamines and terephthalic acid, isophthalic acid, adipic acid, sebacic acid and other dicarboxylic acids are polycondensed. The resulting polymer or copolymer or a blend thereof. Examples of the hard component include nylon 11, nylon 12, and nylon 6, and the soft component may be exemplified by a polyamide elastomer which is a block copolymer made of polyether, aliphatic polyester, or the like, but is not limited thereto. It is not something.
A particularly preferred polyamide polymer in the present invention is a polyamide resin having 4 or more amide groups per 100 atoms of chain molecules in the polyamide polymer molecule. That is, a polyamide resin material having a high concentration of amide groups is preferred. Specifically, polymers such as nylon 6, nylon 11, nylon 12, nylon 66, nylon 46, nylon 610, 6T nylon, 6I nylon, MXD-6 nylon, 6T / 6I nylon, 6T / 6 nylon, and polyamide elastomer Examples thereof include copolymers or blends containing these as components, but are not limited thereto.
The relative viscosity of the polyamide polymer is 1.8 to 3.6, preferably 2.1 to 3.4, as measured by the 98% sulfuric acid method. If the relative viscosity is less than 1.8, the strength and toughness are not sufficient, and if it is 3.6 or more, the fluidity is insufficient and a good molded product cannot be obtained.

    In this invention, you may mix | blend a reinforcing material and a filler with a thermoplastic resin material in the range which does not impair the objective of this invention. Specifically, fibrous inorganic reinforcing materials such as glass fiber, flat glass fiber, carbon fiber, ceramic fiber, needle-shaped wallast, whisker, powder such as silica, alumina, talc, kaolin, quartz, glass flake, mica, graphite, etc. However, the present invention is not limited to these. These reinforcing materials and fillers can be blended alone or in combination of two or more. These reinforcing materials and fillers may be those treated with epoxy silane or amino silane as a surface treatment agent.

  On the other hand, other polymers may be blended with the thermoplastic resin material as long as the object of the present invention is not impaired. For example, a polystyrene resin and a polyolefin resin can be mentioned. These polymers can be modified with an epoxy compound, an oxadoline compound, maleic anhydride, or the like in order to improve compatibility with a thermoplastic resin having an ester bond or an amide bond in the main chain. Specifically, modified polystyrene resin and modified polyolefin resin can be exemplified.

The film made of a thermoplastic resin in the present invention is preferably a film processed from a thermoplastic resin that is compatible with the thermoplastic resin material. In the case of TPE, it is composed of a hard component and a soft component, and among these components, a film processed from the same kind of thermoplastic resin as the hard component is particularly preferred. Specifically, the olefinic TPE is a resin of a polypropylene resin, a polyethylene resin, and a copolymer thereof, and the polyester-based TPE is a resin of a polyethylene terephthalate, polybutylene terephthalate, polynaphthalene terephthalate, or a copolymer thereof. Polyamide-based TPE is a resin of nylon 12, nylon 11, nylon 6, etc. and a copolymer thereof. In particular, polyamide resins include many similar resins, such as nylon 66, nylon MXD6, nylon 610, and the like, and all crystalline polyamide resins having an acid amide bond (—CONH—) in the molecule can be used.
As a method of selecting a compatible resin, the weight ratio of thermoplastic resin material pellets and thermoplastic film raw material pellets is mixed at 0.5 to 2.0 and then molded by injection molding or press molding. A combination of materials that does not cause peeling is included. The temperature of the injection molding machine or press machine at this time is set to be equal to or higher than the melting point of the thermoplastic resin and the raw material pellets of the thermoplastic film. Although it does not specifically limit about the shape of a molded article, It is easy to confirm in the thin molded article about 1-2 mm in thickness.

  The thickness of the film made of the thermoplastic resin in the present invention is not particularly limited, but is 10 μm to 500 μm. Particularly preferably, the thickness is 30 μm to 200 μm. When the film thickness is 10 μm or less, the amount of rapid heat generation due to heat conduction from the metal material becomes large when laser irradiation is performed, which is not preferable. On the other hand, if the film is 500 μm or more, the heat conduction to the thermoplastic resin material is deteriorated, which is not preferable.

  In the thermoplastic resin material of the present invention, other polymers and other TPEs can be blended as necessary within a range not impairing the object of the present invention. Crystal nucleating agents, lubricants, mold release agents, plasticizers, light or heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, flame retardants, pigments, dyes, and the like can also be added.

  The laser beam used for laser welding in the present invention is not particularly limited, but in general, a solid laser such as ruby, glass and YAG, a semiconductor laser such as GaAs and InGaAsP, helium-neon, argon, carbon dioxide gas, Examples thereof include gas lasers such as excimers. More preferable lasers are a semiconductor laser (LD laser diode, wavelength 808 to 940 nm) and a YAG laser (yttrium, aluminum, garnet crystal, wavelength 1064 nm), but are not limited thereto. If the laser wavelength is shorter than 400 nm, the resin may be significantly deteriorated, which is not preferable.

In the present invention, the output of the laser beam is as high as 50 to 2000 W, and rapid heating is performed so that the temperature of the surface of the metal material is instantaneously and locally 500 to 1500 ° C.
In the case of fusion bonding of a metal material and a thermoplastic resin material, the thermoplastic resin material in contact with the metal material is rapidly heated by heat conduction from the metal material, and only the surface in contact with the metal material melts. In the central part, the temperature becomes extremely high locally and instantaneously. Due to local and instantaneous heating of the thermoplastic resin material, the thermoplastic resin material melts and partially decomposes at the surface layer portion in contact with the joint, and a chemical bond is formed between the metal and the metal. This chemical bond enables joining of the thermoplastic resin material and the metal material.

  On the other hand, since TPE has lower crystallinity and elastic modulus than general thermoplastic resin materials, thermal conductivity from the surface in contact with the metal material further reduces the elastic modulus of the entire TPE material, resulting in thermal expansion. It will be deformed by its own weight and its adhesion to the metal material will be reduced. For this reason, it is presumed that it was difficult to weld and bond the metal material and TPE by laser light.

In the present invention, a thermoplastic resin film compatible with TPE is interposed between the metal material and TPE, thereby generating rapid heat generation from the metal material and local melting / decomposition through the film. The adhesion between the metal material and the film and the TPE material was remarkably improved, and the welding joining between the metal material and the TPE became possible.
Further, when this film is melted, it is laminated and integrated with TPE having good compatibility, and a strong welded joint interface between the metal material and the TPE material is formed.

In the present invention, since a film is interposed between the thermoplastic resin material and the metal material, the thermal energy of the metal material generated by the laser irradiation is melted in the film and the surface layer portion of the surface in contact with the film of the thermoplastic resin material. Although it will be used, it is mainly used for melting films.
Since the heat capacity of the film is lower than that of a general molded product, it can be melted with less energy. Therefore, the laser output necessary for joining the thermoplastic resin material and the metal material can be reduced, and the laser irradiation condition range can be widened.

In the present invention, the laser beam can be irradiated not only from the thermoplastic resin material side but also from the metal material side, but from the metal material side because it is not affected by the laser beam transmittance of the thermoplastic resin. Irradiation is preferred. That is, when the thermoplastic resin material has good laser transparency, laser light irradiation can be performed from the thermoplastic resin material side and the metal material side. However, if the laser permeability of the thermoplastic resin material is low, the thermoplastic resin material absorbs the laser beam energy before it heats up the metal material and generates heat, and the thermoplastic resin material deteriorates before welding. Sometimes it ignites. Further, the laser transmittance of the thermoplastic resin material generally depends on the thickness. Therefore, if the thermoplastic resin material has a thickness, the thermoplastic resin material generates heat before the heat generation of the metal material, causing deterioration or ignition. Therefore, it is preferable to irradiate from the metal material side.
If laser light is irradiated from the metal side, the laser transmittance and thickness of the thermoplastic resin material are not a problem at all. When laser light is irradiated from the metal material side, it is necessary to heat the metal material locally and instantaneously, so the thickness of the metal material is important. In the present invention, the thickness of the metal material when laser light is irradiated from the metal material side is 6 mm or less, preferably 3 mm or less.

According to the present invention, it has become possible to perform laser welding of a metal material and a TPE material, which have been difficult to weld and bond using a laser.
Furthermore, it has become possible to weld and bond a thermoplastic resin material and a metal material under a lower output and a wide range of laser conditions.
With the laser-welded joining method of a metal material and a thermoplastic resin material, local joining, pinpoint joining, free curve joining, and the like can be quickly and inexpensively manufactured. Therefore, it can be used in a wide range of fields such as automobiles and electronic / electrical parts.

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples.
The materials used in Examples and Comparative Examples of the present invention are as follows.
TPE used the following materials. Perprene P-90B (manufactured by Toyobo Co., Ltd., Shore D hardness = 52, hard component PBT) was used as the polyester-based thermoplastic elastomer. Since the material was colored black by carbon, the laser transmittance was 0.
Further, Pebax 5533 (manufactured by Toray Industries Inc., Shore D hardness = 55, hard component is nylon 12) was used as the polyamide-based thermoplastic elastomer. Since the material was colored black by carbon, the laser transmittance was 0.
As a film of a thermoplastic resin compatible with each TPE, a PET film (Toyobo Co., Ltd.) was used for Perprene P-90B, and a nylon 6 film (Toyobo Co., Ltd.) was used for Pebax 5533. The thickness of each film is 50 μm.
As the polyester resin material, EMC730 (Toyobo Co., Ltd., 30% glass fiber reinforced PBT resin) was used. The laser transmittance was 0.4 at a thickness of 2 mm.
As the polyamide resin material, T-714H (Toyobo Co., Ltd., amorphous polyamide resin) was used. The laser transmittance was 0.9 at a thickness of 2 mm.

The thermoplastic resin material was formed into a 30 × 70 × 2 mmt flat plate using an injection molding machine.
As the metal material, SUS-304 stainless steel and aluminum alloy (Al) were used. The dimensions of these metal materials are 30 × 70 × 1 mmt.
As the laser type, a YAG solid laser (yttrium, aluminum, garnet crystal) and a semiconductor laser were used.
Moreover, the tensile test was done about the sample which could confirm welding joining, and the welding strength was measured. The tensile test speed is 5 mm / min.

Laser weldability was determined according to the following criteria based on the appearance after the tensile test.
・: Base material breakage or plastic deformation of the resin △: Separation at the interface between metal and resin
X: Not bonded, measurement is impossible Further, a sample for which welding bonding was confirmed was subjected to a tensile test, and the welding strength was measured. The tensile test speed is 5 mm / min.

Example 1 is a result of welding and joining of a polyester thermoplastic elastomer, a PET film, and stainless steel by laser irradiation. The direction of laser irradiation is from the metal material side.
The welded joint was good, and when the tensile strength of the joint was tested, plastic deformation occurred in the polyester-based thermoplastic elastomer portion when it reached 830N. However, the welded joint did not break. On the other hand, in Comparative Example 1, the PET film is not interposed. In Comparative Example 1, welding could not be carried out even by laser irradiation. In Comparative Example 2, the laser output was further increased, but welding could not be performed.
In Comparative Example 3, a PA film that was not compatible with P-90B was interposed in place of the PET film, but welding could not be performed.
In Example 2, it is the result of the welding joining by the laser irradiation of a polyamide-type thermoplastic elastomer, NY6 film, and stainless steel. In Example 2 with a NY6 film interposed, welding by laser irradiation was possible. When the tensile strength test of the joint portion was performed, plastic deformation occurred in the polyamide-based thermoplastic resin material when it reached 900N. On the other hand, in Comparative Example 4, the NY6 film was not interposed, but it was not possible to weld and bond even with laser irradiation as in Comparative Example 1.
In Comparative Examples 1, 2, 3 and 4, welding joining by laser irradiation could not be performed. As this cause, it is presumed that the adhesion between the metal material and the TPE material is lowered during the laser irradiation.
In Comparative Example 5, the laser irradiation direction was from the resin material side. However, since P-90B was a coloring material made of carbon, the laser transmittance was 0, and the resin material generated intense heat and ignited.
Hereinafter, Examples 3 to 6 are read as Reference Examples 3 to 6, respectively.

Example 3 is a result of welding joining by laser irradiation of T-714H, which is a polyamide resin material, PA film, and stainless steel. The laser irradiation direction is from the resin material side.
The welded joint was good and the tensile strength of the joint was tested. When it reached 3400 N, T-714H broke the base metal. The laser output at this time is 60W.
Further, in Example 4, the laser output was increased to 150 W, but as in Example 3, good weld joint could be confirmed. The tensile strength of the joint was 3200 N, and T-714H broke the base material.
On the other hand, in Comparative Example 6, T-714H and stainless steel were overlapped with no PA film, and the same laser irradiation conditions as in Example 3 were performed. Although a slight trace of welding was observed, when the tensile strength test was performed, it was peeled off at the interface of the welding surface when it reached 600N.
In Comparative Example 7, the laser output was increased to 100 W from Comparative Example 6, but the tensile strength of the joint was 1200 N, and the interface was separated at the welded joint surface.
In Comparative Example 8, the same welding strength as in Example 3 was finally obtained by increasing the laser output to 150 W. It was confirmed that welding can be performed at a lower output by placing a film between the thermoplastic resin material and the metal material.
Example 5 is a result of welding joining by laser irradiation of T-714H, which is a polyamide resin material, PA film, and stainless steel, and the laser irradiation direction is from the metal material side.
The welded joint was good and the tensile strength of the joint was tested. When it reached 3300 N, T-714H broke the base metal.

Example 6 is a result of welding joining by laser irradiation of EMC730, which is a polyester resin material, a PET film, and an aluminum alloy. The direction of laser irradiation is from the metal material side.
The welded joint was good, and the tensile strength of the joint was tested and reached 3500N.
On the other hand, in Comparative Example 9, laser welding was attempted under the conditions excluding the PET film from Example 5, but the tensile strength of the joint was tested and reached only 800N.

According to the present invention, it has become possible to perform laser welding of a metal material and a TPE material, which have been difficult to weld and bond using a laser.
Furthermore, it has become possible to weld and bond a thermoplastic resin material and a metal material under a lower output and a wide range of laser conditions.
With the laser-welded joining method of a metal material and a thermoplastic resin material, local joining, pinpoint joining, free curve joining, and the like can be quickly and inexpensively manufactured. Therefore, it can be used in a wide range of fields such as automobiles, electronic / electrical parts, etc. and contributes to the industry.

Test piece for evaluating laser weldability (a) Plan view, (b) Side view

Explanation of symbols

-Thermoplastic resin material-Metal material-Film made of the same type of thermoplastic resin as the thermoplastic resin material-Direction of laser light irradiation-Welded part by laser light irradiation-Fixing jig for TPE material and metal material w Sample width (30mm)
d Sample thickness (2mm)

Claims (1)

In the joining of the thermoplastic resin material and the metal material, the thermoplastic resin material is a polyester thermoplastic elastomer, a polyamide thermoplastic elastomer or an olefin thermoplastic elastomer, and is compatible with the thermoplastic resin material at the joining interface. A method for joining a thermoplastic resin material and a metal material, characterized in that a thermoplastic film is melted and welded together by interposing a certain thermoplastic film and generating heat by irradiating laser light to heat the metal material.

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