Origin Electric Company, Limited

Origin Company, Limited

Yasuo Kadoya

Akio Komatsu

Yuki Oshino

Kouji Arai

Hironobu Nishimura

Hiroji Sasaki

Koji Matsubara

To provide a method and apparatus for manufacturing a joined member that inhibit occurrence of cracks in a joined member even when the joined portion is quenched when members are welded together. The method includes placing the first member D and the second member E with a joint target portion Df and a joint target portion Ef being in contact with each other, welding the joint target portions by heating, subjecting the first member D after the welding to a process for inhibiting occurrence of cracks, and tempering a portion where the first and second members have been welded to each other by electromagnetic heating. The apparatus includes a first electrodeto contact with the first member D; a second electrodeto contact with the second member E; and an induction heating coilfor performing induction heating of a portion where a joint target portions Df and Ef have been contacted and joined to each other, and the induction heating coilis placed between the two electrodesandwhen the induction heating is performed.

Method for manufacturing joined member and apparatus for manufacturing the same

A method for manufacturing a joined member and a joined member manufacturing apparatus which can manufacture a joined member with a joint portion having an appropriate hardness. A method for manufacturing a joined member C by joining a first member D formed of a metal material having a possibility of undergoing quenching and a second member E formed of a metal material, the method includes a contact-placing step Sof placing the first and second members D and E with joint target portions of the first and second members D and E respectively being in contact with each other; a joining step Sof joining the first and second members D and E by passing a pulsed welding electric current Afor joining through the joint target portions J of the first and second members D and E; a first tempering step Sof tempering a joint portion F, where the first and second members D and E are joined, by passing a first tempering electric current Athrough the joint portion F; and a second tempering step Sof tempering the joint portion F by passing a second tempering electric current Asmaller than the first tempering electric current Athrough the joint portion F.

Method for manufacturing joined member and joined member manufacturing apparatus

To provide a metal bonded product wherein a large bonding area can be provided to achieve high bonding strength and coaxial accuracy can be easily achieved needing no positioning jig. A first taper portionis formed on a side wall surface of the openingof the ring-shaped metal member, and multiple step-shaped bonding surfaces are formed thereon. An end of the cylindrical portionhas a second taper portionwith the same chamfer angle as that of the first taper portionof the ring-shaped metal member. The ring-shaped metal memberand the cylindrical metal memberare bonded to each other by press-fitting the cylindrical portion of the cylindrical metal memberin the openingof the ring-shaped metal memberwhile applying a current to cause the side wall portion of the cylindrical portion of the cylindrical metal memberand the multiple step-shaped bonding surfaces of the first taper portionto undergo plastic flow.

Metal bonded product and method for producing metal bonded product

An economical capacitor-type welding device and capacitor-type welding method that have a small power loss, that can be made compact, and that reliably control a charging circuit without being affected by the inductance of a charging path. In an exemplary capacitor-type welding device and an exemplary capacitor-type welding method of the invention, a bypass switching element having a forward-blocking function is connected in parallel to output terminals of a charging circuit, and the bypass switching element is brought into a conduction state to allow a backflow current, which is caused to flow by a magnetic energy stored in the inductance of a primary winding or an inductor included in the charging path, to bypass the charging circuit. A discharge switching element is brought into a conduction state after the bypass switching element enters the non-conduction state and recovers the forward-blocking function.

Capacitor-type welding device and capacitor-type welding method

A method for manufacturing a bonded article having long bonding length and high strength. A first bonding target member and a second bonding target member having a hole portion for receiving the first member are provided. Pressing force is applied between the two members with the first member received in the hole portion, and a current is applied to a bonding target portion between the two members with the pressing force applied. The two members are of materials with different melting points. One of the two members, having lower melting point, has a heat capacity increasing portion in the vicinity of the target portion. The one of the members has a taper face at the target portion, and the heat capacity increasing portion has a face extending from the taper face. The force applying step is performed with the other member positioned not to contact the heat capacity increasing portion.

Bonded article and method for manufacturing bonded article

The capacitive welder includes a charging circuit, a welding transformer, a capacitor, a discharging switching element connected in parallel with a primary winding of the welding transformer and the capacitor that are connected in series, a bypass switching element connected in parallel with the primary winding, welding electrodes connected in parallel with a secondary winding of the welding transformer, and a control circuit for bringing the welding transformer into a reset allowing state by allowing a reset current to flow in the primary winding using the input power introduced through the charging circuit without supplying an ON signal to the bypass switching element, and then supplying the ON signal to the bypass switching element such that the capacitor is charged through the bypass switching element by the input power introduced through the charging circuit.

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Saitama, Japan

Yasuo Kadoya