| 摘要 |
PURPOSE:To enable to perform welding having superior airtightness and high reliability by a method wherein welding is performed changing a welding current at the short side part and the long side part of a cap. CONSTITUTION:Slits 13-16 are provided at the positions corresponding to the divided angles (a) degrees, (b) degrees in an angle detecting slit disc 9, an angle detecting sensor 10 to detect the slits 13-16 thereof is provided in the neighborhood of the circumference of the disc 9, and moreover an original point detecting sensor 12 is provided in the neighborhood of the circumference of an original point detecting slit disc 11. After a cap 5 is set on a package 6, when it is set on a jig table 7, mutually facing roller electrodes 1, 2 come in contact with a welding start line S-S' to apply the prescribed weight. The table 7 rotates at the same time when a welding current A flows to start welding, and when the sensor 10 detects the slit 13, a detecting signal is sent to a welding current control circuit, the welding current is changed from A to B, and when the next slit 14 is detected moreover, the welding current is changed again to A. |
