Welding method and welding device
AssigneeHonda Motor Co., Ltd.
InventorsAkira Goto, Shinichi Miyasaka, Tatsuro Ikeda, Yushi Aoki, Mitsutaka Igaue
Life of this patent
Estimating the term…
Abstract
A resistance welding device is provided with a lower tip and an upper tip that serve as welding tips, and pressing rods that serve as pressing members. The upper tip and the pressing rods press a stacked body, which is to be welded, from the metallic plate side, which is the outermost member of the stacked body. The lower tip presses the stacked body from the lowermost metallic plate side. In this state, and electric current is conducted from the upper tip to the lower tip.
Claims19
A resistance welding method for carrying out resistance welding with respect to a stacked body formed by stacking a plurality of workpieces, comprising the steps of:
- sandwiching the stacked body between a first welding tip and a second welding tip, while bringing a pressing member into abutment against an outermost workpiece, which is positioned on an outermost portion of the stacked body and against which the first welding tip is in abutment, the stacked body being pressed from a side of the outermost workpiece by the pressing member;
- and
- conducting an electric current between the first welding tip and the second welding tip while maintaining a pressure by the pressing member.
A resistance welding method for carrying out resistance welding with respect to a stacked body formed by stacking a plurality of workpieces, comprising the steps of:
- sandwiching the stacked body between a first welding tip and a second welding tip, and bringing an auxiliary electrode having a polarity opposite to that of the first welding tip into abutment against an outermost workpiece, which is positioned on an outermost portion of the stacked body and against which the first welding tip in abutment;
- carrying out resistance welding on the stacked body by conducting an electric current between the first welding tip and the second welding tip, and causing a branching current to flow from the first welding tip to the auxiliary electrode, or to flow from the auxiliary electrode to the first welding tip;
- electrically insulating the first welding tip and the auxiliary electrode from each other and stopping flow of the branching current, while continuing conduction of the electric current between the first welding tip and the second welding tip;
- and
- stopping conduction of electric current between the first welding tip and the second welding tip,
- wherein a time from start of conduction of an electric current between the first welding tip and the second welding tip until stopping conduction of the electric current is controlled by a welding timer, and the welding timer sends an electrical conduction start signal to a branching current timer, and
- wherein the branching current timer carries out a control to initiate measurement of time from receipt of the electrical conduction start signal, and to stop the branching current when a predetermined set time is reached.
A resistance welding method for carrying out resistance welding with respect to a stacked body formed by stacking a plurality of workpieces, comprising the steps of:
- sandwiching the stacked body between a first welding tip and a second welding tip, and bringing an auxiliary electrode having a polarity opposite to that of the first welding tip abutment against an outermost workpiece, which is positioned on an outermost portion of the stacked body and against which the first welding tip is in abutment;
- carrying out resistance welding on the stacked body by conducting an electric current between the first welding tip and the second welding tip, and causing a branching current to flow from the first welding tip to the auxiliary electrode, or to flow from the auxiliary electrode to the first welding tip;
- and
- electrically insulating the first welding tip and the auxiliary electrode from each other and stopping flow of the branching current when a slope of a conduction time vs. temperature graph of the outermost workpiece changes from a large slope to a small slope.
A resistance welding device for carrying out resistance welding with respect to a stacked body formed by stacking a plurality of workpieces, comprising:
- a first welding tip and a second welding tip that sandwich the stacked body therebetween;
- a pressing member that abuts against an outermost workpiece, which is positioned on an outermost portion of the stacked body, at a region thereof that differs from a region where the first welding tip is in abutment, for thereby pressing the stacked body from a side of the outermost workpiece;
- and
- a pressing mechanism for generating a pressing force on the pressing member.
A resistance welding device for carrying out resistance welding with respect to a stacked body formed by stacking a plurality of workpieces, comprising:
- a first welding tip and a second welding tip that sandwich the stacked body therebetween;
- an auxiliary electrode that abuts against an outermost workpiece, which is positioned on an outermost portion of the stacked body together with the first welding tip, and having a polarity opposite to that of the first welding tip;
- a welding timer that controls a time of conduction of electric current when current is conducted between the first welding tip and the second welding tip, which sandwich the stacked body therebetween for carrying out resistance welding thereon;
- a branching current timer, which when the current is conducted, controls a time during which a branching current flows from the first welding tip to the auxiliary electrode, or flows from the auxiliary electrode to the first welding tip;
- and
- a control circuit that sends an electrical conduction start signal to the welding timer, and inputs to the branching current timer a time at which the branching current flows,
- wherein, by operation of the welding timer to which the electrical conduction start signal was sent, the electrical conduction start signal is sent to the branching current timer simultaneously with start of electrical conduction between the first welding tip and the second welding tip.
A resistance welding device for carrying out resistance welding with respect to a stacked body formed by stacking a plurality of workpieces, comprising:
- a first welding tip and a second welding tip that sandwich the stacked body therebetween;
- an auxiliary electrode that abuts against an outermost workpiece, which is positioned on an outermost portion of the stacked body together with the first welding tip, and having a polarity opposite to that of the first welding tip;
- and
- a control circuit, which when resistance welding is carried out by conducting an electric current between the first welding tip and the second welding tip that sandwich the stacked body therebetween, controls a time during which a branching current flows from the first welding tip to the auxiliary electrode, or flows from the auxiliary electrode to the first welding tip,
- wherein the control circuit electrically insulates the first welding tip and the auxiliary electrode from each other and stops flow of the branching current when a slope of a conduction time vs. temperature graph of the outermost workpiece changes from a large slope to a small slope.
Dependencies are inferred from the claim text.