| 摘要 |
PURPOSE:To regulate the finish sizes of products surely by stopping welding by contact of both electrodes and transfer of pressurizing force and welding current to both electrodes when the 1st, 2nd materials to be welded are joined to a prescribed size on progression of welding. CONSTITUTION:The 1st annular material 16 to be welded and the 2nd circular cylindrical member 18 to be welded having a projecting part 20 are brought into contact with each together via the part 20 and are placed on the placing surface 14 of a lower electrode 12; at the same time, an upper electrode 10 is installed on the material 16. When pressure is exerted between the electrode 10 and the electrode 12, and welding current is passed, the current flows through the part 20 in a direction A and melts said part. On progression of the welding, the electrode 10 contacts with the stopper part 22 of the electrode 12 and the current flows in a direction B and virtually no current flows through the part 20; at the same time, no pressurizing force is exerted; therefore thew welding is stopped. If the height L of the part 22 is formed to a prescribed size, the materials 16, 18 are welded to the prescribed finish size. |
