Abstract: Provided is a hot-dip plating method that achieves good plating wettability between a metal material and a hot-dip plating bath and that makes it possible to reduce the amount of consumed energy as compared to conventional techniques. In a plating step included in the hot-dip plating method, vibration is applied to a hot-dip plating bath such that the ratio of the average sound pressure level (excluding noise) over ranges each lying between sound pressure peaks at harmonic frequencies of a fundamental frequency to the average sound pressure level (excluding noise) over the measured frequency range in an acoustic spectrum is greater than 0.2.

Abstract: Provided is a hot-dip plating method that achieves good plating wettability between a metal material and a hot-dip plating bath and that makes it possible to reduce the amount of consumed energy as compared to conventional techniques. In a plating step included in the hot-dip plating method, vibration is applied to a hot-dip plating bath such that the ratio of the average sound pressure level (excluding noise) over ranges each lying between sound pressure peaks at harmonic frequencies of a fundamental frequency to the average sound pressure level (excluding noise) over the measured frequency range in an acoustic spectrum is greater than 0.2.

Abstract: A method of producing an Al plated steel wire comprises a first step of continuously immersing a material steel wire formed of a steel core into a molten Al plating bath and then withdrawing the material steel wire to a gas phase space. The material steel wire plated with a plating metal is brought into contact with a contact member at the plating bath rising portion to produce the Al plated steel wire, the Al plated steel wire having an average diameter DA (mm) and a minimum diameter DMIN (mm) in the longitudinal direction of the wire satisfying the following expression (1) (DA?DMIN)/DA?0.10,??(1). The Al plated steel wire is then wound.

Abstract: A hot-dip aluminum-coated steel wire including a steel wire having a diameter of 0.1 to 0.4 mm on which a plating layer is formed, wherein an elongation at break of the hot-dip aluminum-coated steel wire is 5 to 30%, and a ratio of an average diameter of the steel wire which is taken out from the hot-dip aluminum-coated steel by removing the plating layer per 100 mm in length of the steel wire to the minimum diameter of the steel wire satisfies the formula: [minimum diameter/average diameter]?[1?(elongation at break (%)/100)], and a method for producing a hot-dip aluminum-coated steel wire including wire-drawing a hot-dip aluminum-coated steel wire so that a ratio of an average diameter of the steel wire which is taken out from the hot-dip aluminum-coated steel by removing the plating layer per 100 mm in length of the steel wire to the minimum diameter of the steel wire satisfies the above-mentioned formula, and an elongation at break of the hot-dip aluminum-coated steel wire is 5 to 30%.

Abstract: A composite twisted wire (1) which is obtained by twisting a plurality of strands. This composite twisted wire (1) includes: an aluminum-covered strand (2) that is obtained by forming a coating film (2b), which is formed of aluminum or an aluminum alloy, on the surface of a steel wire (2a); and an aluminum wire (3) that is formed of aluminum or an aluminum alloy. This composite twisted wire is reduced in weight, while exhibiting excellent tensile strength and excellent long-term stability with respect to electrical resistance. Consequently, this composite twisted wire is suitable, for example, for use as a wire harness of automobiles.

Abstract: Provided is a method for producing a molten aluminum-plated steel wire in which a steel wire (2) is immersed in a molten aluminum plating bath (1), the resulting molten aluminum-plated steel wire (3) is subsequently pulled up from the molten aluminum plating bath (1) and a stabilizing member (11) is brought into contact with the bath surface (10) of the molten aluminum plating bath (1) and the molten aluminum-plated steel wire (3) at the boundary between the molten aluminum-plated steel wire (3) and the bath surface (10) of the molten aluminum plating bath (1), a nozzle (12) for blowing an inert gas is arranged in a position facing the stabilizing member (11) with the molten aluminum-plated steel wire (3) therebetween, and an inert gas is blown from the tip (12a) of the nozzle (12) toward the boundary at a pressure of 0.1-20 kPa.

Abstract: A production method for molten-aluminum-plated copper wire, the production method being characterized by use of a heating device (6) that is for heating a copper wire (2) before the copper wire (2) is immersed in a molten aluminum plating bath (1) and of a bath surface control device (7) that comprises a tube-shaped body (9), which has a through hole (9a) for passing the copper wire (2) through the inside thereof, and includes an immersion region (9b) that is for immersion in the molten aluminum plating bath (1) from an end part of one end of the tube-shaped body (9) along the long direction of the tube-shaped body (9). The production method is also characterized in that the copper wire (2) is passed, in order, through the heating device (6) and the bath surface control device (7) and immersed in the molten aluminum plating bath (1) while the immersion region (9b) of the bath surface control device (7) is immersed in the molten aluminum plating bath (1).

Abstract: Provided is a method for producing a molten aluminum-plated steel wire in which a steel wire (2) is immersed in a molten aluminum plating bath (1), the resulting molten aluminum-plated steel wire (3) is subsequently pulled up from the molten aluminum plating bath (1) and a stabilizing member (11) is brought into contact with the bath surface (10) of the molten aluminum plating bath (1) and the molten aluminum-plated steel wire (3) at the boundary of the molten aluminum-plated steel wire (3) and the bath surface (10) of the molten aluminum plating bath (1), a nozzle (12) for blowing an inert gas is arranged in a position facing the stabilizing member (11) with the molten aluminum-plated steel wire (3) therebetween, and an inert gas having a temperature of 600-1000° C. is blown from the tip (12a) of the nozzle (12) toward the boundary at a pressure of 0.1-20 kPa.

Abstract: A method of producing an Al plated steel wire comprises a first step of continuously immersing a material steel wire formed of a steel core into a molten Al plating bath and then withdrawing the material steel wire to a gas phase space. The material steel wire plated with a plating metal is brought into contact with a contact member at the plating bath rising portion to produce the Al plated steel wire, the Al plated steel wire having an average diameter DA (mm) and a minimum diameter DMIN (mm) in the longitudinal direction of the wire satisfying the following expression (1) (DA?DMIN)/DA?0.10, (1). The Al plated steel wire is then wound.

Abstract: A production method for molten-aluminum-plated steel wire, the production method being characterized in that a steel wire (2) immersion part (6) at which the steel wire (2) is to be immersed in a molten aluminum plating bath (1) is immersed in the molten aluminum plating bath (1) after the steel wire (2) has been passed into a steel wire introduction device (7) while an immersion region (9a) thereof has been immersed in the molten aluminum plating bath (1). The steel wire introduction device (7) comprises a tube-shaped body (9), which has a total length of 10 to 1000 mm and has a through hole (8) that is for passing the steel wire (2) through the inside thereof, and includes the immersion region (9a), which is for immersion in the molten aluminum plating bath (1) to a length of 2 mm to 400 mm from an end part of one end of the tube-shaped body (9) along the long direction of the tube-shaped body (9).

Abstract: A method for producing a hot-dip aluminum-coated steel wire, including dipping a steel wire in molten aluminum, and drawing up the steel wire from the molten aluminum, wherein at the time of drawing up the steel wire from the molten aluminum, a stabilization member is contacted with a surface of the molten aluminum and the steel wire at the boundary between the steel wire and the surface of the molten aluminum, a nozzle having a tip end of which inside diameter is 1 to 15 mm is disposed so that the tip end is positioned at a place away from the steel wire by a distance of 1 to 50 mm, and an inert gas having a temperature of 200 to 800° C. is blown out from the tip end to the boundary at a volume flow rate of 2 to 200 L/min.

Abstract: A method for producing a hot-dip aluminum-coated steel wire, including dipping a steel wire in molten aluminum, and drawing up the steel wire from the molten aluminum, wherein at the time of drawing up the steel wire from the molten aluminum, a stabilization member is contacted with a surface of the molten aluminum and the steel wire at the boundary between the steel wire and the surface of the molten aluminum, a nozzle having a tip end of which inside diameter is 1 to 15 mm is disposed so that the tip end is positioned at a place away from the steel wire by a distance of 1 to 50 mm, and an inert gas having a temperature of 200 to 800° C. is blown out from the tip end to the boundary at a volume flow rate of 2 to 200 L/min.

Abstract: A crimp terminal includes an F-type crimp portion and a C-type crimp portion. The F-type crimp portion has first and second barrel tabs, preferably with an identical length, for crimping a tip end of a complex stranded wire. The F-type crimp portion is adapted to have distal ends of the first and second barrel tabs put together and pushed into the tip end of the complex stranded wire to be crimped. The C-type crimp portion has a third barrel tab for crimping the complex stranded wire. The third barrel tab is wound in a C-form on an outer periphery of the complex stranded wire to be crimped. The arrangement provides a crimp terminal and an electric wire with crimp terminal, that prevents or reduces increases in retained resistance at a crimp portion, and can also prevent an electric wire from slipping out of a crimp terminal.

Abstract: A crimp terminal includes an F-type crimp portion and a C-type crimp portion. The F-type crimp portion has first and second barrel tabs, preferably with an identical length, for crimping a tip end of a complex stranded wire. The F-type crimp portion is adapted to have distal ends of the first and second barrel tabs put together and pushed into the tip end of the complex stranded wire to be crimped. The C-type crimp portion has a third barrel tab for crimping the complex stranded wire. The third barrel tab is wound in a C-form on an outer periphery of the complex stranded wire to be crimped. The arrangement provides a crimp terminal and an electric wire with crimp terminal, that prevents or reduces increases in retained resistance at a crimp portion, and can also prevent an electric wire from slipping out of a crimp terminal.

Abstract: A molten Al plated steel wire excellent in torsional resistance that does not cause breakage due to torsion in application to an ordinary production equipment for a strand wire, in which element wires are applied with torsion is provided. A molten Al plated steel wire containing a steel core wire having a diameter of from 0.05 to 0.50 mm as a core material, having thereon molten Al plating with a depositing amount thereof that is uniformized to satisfy the following expression (1) for an average diameter DA (mm) and a minimum diameter DMIN (mm) in the longitudinal direction of the wire: (DA?DMIN)/DA0.10.

Abstract: A connector includes a crimping portion (12) provided at an inner surface with projections (13) having inclined sides (19), the crimping portion (12) being provided with a combination of a base portion (14) and first and a second protruding portions (15) and (16) protruding from the base portion (14), the first protruding portion (15) having a distal end part (15a) located at an inside of a distal end part (16a) of the second protruding portion (16), the crimping portion (12) having a ring-shaped section perpendicular to a length direction of the aluminum electric wire (21), the projections (13) being projected into surface areas of the aluminum electric wire (21), with distorted regions formed along the inclined sides (19) in a surface part of the aluminum electric wire (21).

Abstract: A composite twisted wire (1) which is obtained by twisting a plurality of strands. This composite twisted wire (1) includes: an aluminum-covered strand (2) that is obtained by forming a coating film (2b), which is formed of aluminum or an aluminum alloy, on the surface of a steel wire (2a); and an aluminum wire (3) that is formed of aluminum or an aluminum alloy. This composite twisted wire is reduced in weight, while exhibiting excellent tensile strength and excellent long-term stability with respect to electrical resistance. Consequently, this composite twisted wire is suitable, for example, for use as a wire harness of automobiles.

Abstract: A connector includes a crimping portion 12 provided at an inner surface with projections 1 having inclined sides 19. The crimping portion is provided with a base portion 14 and first and a second protruding portions 15 and 16 protruding from the base portion 14. The first protruding portion 15 has a distal end part 15a located at an inside of a distal end part 16a of the second protruding portion 16. The crimping portion also has a ring-shaped section perpendicular to a length direction of the aluminum electric wire 21. The projections 13 project into surface areas of the aluminum electric wire 21, with distorted regions formed along the inclined sides in a surface part of the aluminum electric wire. The arrangement provides an aluminum electric wire connecting structure adapted to hold small electric resistances between an aluminum electric wire and a crimping portion of a connector.

Abstract: A crimp terminal includes an F-type crimp portion and a C-type crimp portion. The F-type crimp portion has first and second barrel tabs, preferably with an identical length, for crimping a tip end of a complex stranded wire. The F-type crimp portion is adapted to have distal ends of the first and second barrel tabs put together and pushed into the tip end of the complex stranded wire to be crimped. The C-type crimp portion has a third barrel tab for crimping the complex stranded wire. The third barrel tab is wound in a C-form on an outer periphery of the complex stranded wire to be crimped. The arrangement provides a crimp terminal and an electric wire with crimp terminal, that prevents or reduces increases in retained resistance at a crimp portion, and can also prevent an electric wire from slipping out of a crimp terminal.

Abstract: A steel/aluminum welded structure comprises a hot-dip Al-coated steel sheet 1 spot welded with an aluminum or aluminum alloy sheet 2. The steel sheet 1 is coated with a coating layer 4 containing, by mass, 3-12% of Si and 0.5-5% of Fe. An area ratio of an Al—Fe binary alloy layer, formed at the joint boundary, is controlled to 90% or less. An unalloyed region 9 exists between an Al—Fe—Si ternary alloy layer 6 at an interface of a steel substrate 5 with the coating layer 4 interface and the Al—Fe binary alloy layer at the joint boundary. A steel substrate 5 preferably contains 0.002-0.020% of N for formation of a N-enriched surface layer in contact with the coating layer 4. The N-enriched layer impedes propagation of the brittle Al—Fe binary alloy layer to the whole of the joint boundary and raises joint strength of the steel/aluminum welded structure.