Spot-welding method and spot-welding device
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorsKensuke Sakai, Keigo Kimura
Life of this patent
Estimating the term…
Abstract
When spot-welding a workpiece including a thin plate, a first thick plate, and a second thick plate, the workpiece is clamped by a fixed electrode in contact with the second thick plate, a movable electrode in contact with the thin plate, and control-pressure applying unit set adjacent to the movable electrode and in contact with the thin plate. Pressure is applied to the second thick plate by the fixed electrode, and pressure and control pressure are respectively applied by the movable electrode and the control-pressure applying unit to the thin plate. The pressure from the fixed electrode is controlled to be smaller than the pressure from the movable electrode. The current density between the thin plate and the first thick plate increases.
Claims17
A spot-welding method for spot-welding a workpiece including a thin plate, a first thick plate, and a second thick plate that are sequentially stacked, the first thick plate and the second thick plate being thicker than the thin plate, the spot-welding method comprising the steps of:
- clamping and pressing the workpiece by using a first welding electrode that is brought into contact with the second thick plate, a second welding electrode that faces the first welding electrode and is brought into contact with the thin plate, and control-pressure applying unit that is set adjacent to the second welding electrode and is brought into contact with the thin plate;
- and
- spot-welding the workpiece by applying electricity between the second welding electrode and the first welding electrode in the state where the workpiece is clamped and pressed.
A spot-welding method for spot-welding a workpiece including a first thin plate, a first thick plate, a second thick plate, and a second thin plate that are sequentially stacked, the first thick plate and the second thick plate being thicker than the first thin plate and the second thin plate, the spot-welding method comprising:
- a first welding step for clamping and pressing the workpiece by using a first welding electrode that is brought into contact with the second thin plate, a first control presser that is set adjacent to the first welding electrode and brought into contact with the second thin plate, and a second welding electrode that faces the first welding electrode is brought into contact with the first thin plate, and spot-welding the workpiece by applying electricity between the second welding electrode and the first welding electrode in the state where the workpiece is clamped and pressed;
- and
- a second welding step for moving the first control presser away from the second thin plate while maintaining the workpiece in a clamped state between the first welding electrode and the second welding electrode, setting a second control presser adjacent to the second welding electrode and bringing the second control presser into contact with the first thin plate, and spot-welding the workpiece by applying electricity between the second welding electrode and the first welding electrode in a state where the workpiece is clamped and pressed by the first welding electrode, the second welding electrode, and the second control presser.
A spot-welding device that spot-welds a workpiece including a thin plate, a first thick plate, and a second thick plate that are sequentially stacked, the first thick plate and the second thick plate being thicker than the thin plate, the spot-welding device comprising:
- a first welding electrode that faces the second thick plate;
- a second welding electrode that is coaxially aligned with the first welding electrode and that faces the thin plate of the workpiece so as to clamp and press the workpiece together with the first welding electrode;
- and
- control-pressure applying unit that is set adjacent to the second welding electrode and applies a control-pressure to the thin plate,
- wherein the workpiece is clamped and pressed by the first welding electrode that is brought into contact with the second thick plate, the second welding electrode that faces the first welding electrode is brought into contact with the thin plate, and the control-pressure applying unit, and wherein the workpiece is spot-welded by applying electricity between the second welding electrode and the first welding electrode in the state where the workpiece is clamped and pressed.
A spot-welding device that spot-welds a workpiece including a first thin plate, a first thick plate, a second thick plate, and a second thin plate that are sequentially stacked, the first thick plate and the second thick plate being thicker than the first thin plate and the second thin plate, the spot-welding device comprising:
- a first welding electrode that faces the second thick plate;
- a second welding electrode that is coaxially aligned with the first welding electrode and that faces the first thin plate of the workpiece so as to clamp and press the workpiece together with the first welding electrode;
- and
- control-pressure applying unit including a first control presser that is set adjacent to the first welding electrode and applies a first control pressure to the second thin plate, and a second control presser that is set adjacent to the second welding electrode and applies a second control pressure to the first thin plate,
- wherein the workpiece is clamped and pressed by the first welding electrode and the first control presser that are brought into contact with the second thin plate, and by the second welding electrode that faces the first welding electrode is brought into contact with the first thin plate, and wherein the workpiece is spot-welded by applying electricity between the second welding electrode and the first welding electrode in the state where the workpiece is clamped and pressed, and
- wherein the workpiece is clamped and pressed by the first welding electrode that is brought into contact with the second thin plate, the second welding electrode, and the second control presser that face the first welding electrode are brought into contact with the first thin plate, and wherein the workpiece is spot-welded by applying electricity between the second welding electrode and the first welding electrode in the state where the workpiece is clamped and pressed.
Dependencies are inferred from the claim text.