Patent ID: 9186747
Filing Date: 2015-11-17
Classification: B23K

Abstract:
1. A spot welding apparatus comprising: a first fixed welding electrode; a second movable welding electrode which is moved by a pressure actuator, and the second movable welding electrode is disposed to face the first fixed welding electrode and configured to clamp and press at least three workpieces together with the first fixed welding electrode; and a control pressing force applicator configured to apply a control pressing force to a workpiece of the at least three workpieces by bringing a pressing force applying unit disposed adjacent to the first fixed welding electrode into contact with a lower surface of a thinnest workpiece of the at least three workpieces; wherein spot welding is performed by applying current between the first fixed welding electrode and the second movable welding electrode while the workpiece is clamped and pressed by the first fixed welding electrode that is in contact with the workpiece, the pressing force applying unit of the control pressing force applicator that is in contact with the workpiece, and the second movable welding electrode that faces the first fixed welding electrode and is in contact with the workpiece; and wherein the control pressing force applicator includes: wherein the control pressing force applicator is configured to apply the control pressing force to the workpiece by moving the movable shaft of the control pressing force applying actuator and thereby bringing the pressing force applying unit provided on the distal end of the arm into contact with the workpiece.