A method for joining dissimilar materials includes forming a first recess and a second recess by irradiating a surface of a first member with laser light, the first recess and the second recess being cut into the surface obliquely at angles different from each other, and joining the second member to the surface of the first member with a part of the second member engaging with each of the first recess and the second recess by melting the part of the second member lower in melting point than the first member to cause the part of the second member to flow into each of the first recess and the second recess and solidifying the part of the second member.

An object is to provide a metal-resin bonded member that is easy to manufacture and has high bonding strength. The metal-resin bonded member includes a metal body having an iron oxide layer on the surface and a resin body bonded to the metal body via the iron oxide layer. The iron oxide layer has a thickness of 50 nm to 10 μm. The iron oxide layer comprises 60-40 at % Fe and 40-60 at % O at the outermost surface side. The iron oxide layer contains magnetite (Fe.sub.3O.sub.4). The iron oxide layer is formed by heating the surface of an iron-based substrate at 200-850° C. in an oxidation atmosphere. The resin body is composed of polyphenylene sulfide (PPS). The bonding of the metal body and the resin body via the iron oxide layer can be carried out by insert molding, thermal adhesion utilizing friction heating, etc.

An FRP reinforcing member configured to be used by being attached to an FRP molded body is provided with a plurality of laminated fiber layers being integrated with a resin. An FRP connecting structure includes FRP molded bodies being connected to each other or an FRP molded body and a member made of a material different from the FRP being connected to each other, by a bolt or a rivet. The FRP reinforcing member is attached to the FRP molded body so as to cover a periphery of a bolt hole or a rivet hole of the FRP molded body. An FRP molded body includes a recess or a hole formed on a surface. The FRP reinforcing member is mounted to the FRP molded body so as to cover an opening of the recess or the hole. An FRP reinforcing member producing method includes charging a plurality of fiber layers composed of glass fibers, carbon fibers, or aramid fibers and a resin into a mold, pressing the plurality of fiber layers and the resin at 300° C. or less for 60 minutes or less, and removing a load pressure, cooling, and then demolding after the pressing.

A coated wire includes a steel alloy coated with a coating comprising one or more amino alkoxy-modified silsesquioxane compounds selected from the group consisting of an amino alkoxy-modified silsesquioxane, an amino/mercaptan co-alkoxy-modified silsesquioxane, an amino/blocked mercaptan co-alkoxy-modified silsesquioxane, or a salt of one or more thereof. A rubber composition and a process for coating wire is also disclosed.

A SUS surface treatment method for manufacturing a polymer-SUS joint structure having excellent bond strength is provided. A SUS surface treatment method for bonding with a polymer composite including a first etching step wherein the SUS surface is etched by acidic solution, a surface treatment step wherein the SUS surface is treated by ultrasonic wave, a second etching step wherein the SUS surface is etched again by acidic solution, a first silane coupling treatment step wherein the SUS surface is treated by anodic oxidation, a third etching step wherein the SUS surface is etched by acidic solution, and a second silane coupling treatment step wherein the SUS surface is treated by anodic oxidation.

A ultrasonic welding method of joining dissimilar-material workpieces, such as sheet materials, and the joined components formed thereby. The method includes applying ultrasonic energy to a thermoplastic piece to fill a hole of a dissimilar piece to form a weld point that is made up with polymer from the thermoplastic piece. In general, the geometry of the thermoplastic piece is not altered during the process. The dissimilar piece generally has a higher melting temperate and can be metal, thermoset polymers, or other thermoplastic material. The welded pieces can be arranged in a lap, laminate, or double lap configuration. In some embodiments, the hole of the dissimilar sheet material includes undercut features that improve the mechanical interlock between the dissimilar pieces. In some embodiments, the weld point has a mushroom cap to improve mechanical interlock.

A method of directly joining a polymer to a metal along a joint interface through the formation of C—O—M chemical bonds, where M represents an element in the metal to be joined. The method includes heating the metal to a predetermined temperature above a glass transition temperature of the polymer and less than a flash ignition temperature of the polymer and less than a metal melting temperature of the metal; and applying force to the joint interface of the metal and the polymer to generate intimate atomic contact between the metal and the polymer to create C—O—M chemical bonds between the metal and the polymer.

A method of bonding a second object to a first object includes: providing the first object having a thermoplastic liquefiable material in a solid state; providing the second object having a surface portion that has a coupling structure with an undercut, so that the second object is capable of making a positive-fit connection with the first object; pressing the second object against the first object with a tool that is in physical contact with a coupling-in structure of the second object while mechanical vibrations are coupled into the tool; continuing to press and couple vibrations into the tool until a flow portion of the thermoplastic material of the first object is liquefied and flows into the coupling structures of the second object; and letting the thermoplastic material re-solidify to yield a positive-fit connection between the first and second objects by the re-solidified flow portion interpenetrating the coupling structures.

The method of metal-thermoplastic resin direct bonding is characterized by comprising a first step for irradiating a surface of the metal material with a pulse laser under an oxidizing atmosphere to form a surface modification region, a second step for causing the thermoplastic resin material to abut against the surface modification region to form a bonding interface, and a third step for heating up the bonding interface by laser irradiation to achieve bonding, the first step including forming metal oxide particle clusters obtained when metal oxide particles having a particle diameter of 5-500 nm to be continuously bonded at the surface modification region, so that the maximum height (Sz) of a surface of the metal oxide particle clusters is 50 nm-3 .Math.m.

A laser welded structure is formed by laser welding together a resin molded body formed from a thermoplastic polymer alloy containing a crystalline resin and an amorphous resin and a metal body made of a metal. A glass transition temperature of the amorphous resin is lower than a melting start temperature of the crystalline resin.