| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable more precise processing, enable the control of wear, loosening, damage and the like of a machine tool, and enable the efficient implementation of zero point setting, in the welding control based on zero point setting. Ž<P>SOLUTION: A welding method includes setting a plate-shaped workpiece W and a nut N on a positioning pin 8 projecting upward through a through-hole of a lower electrode 5, pressing the nut N from above to set the zero point of the positioning pin 8, and determining abnormality of the position of the nut N and abnormality of the equipment on the base of the zero point. A cycle comprising a sequence of setting the workpiece on the lower electrode 5, lowering an upper electrode 11, compressing the workpiece, (applying an electric current), and releasing the compression is automatically performed. The zero point can be automatically measured and set during the cycle when the position of the workpiece conforms to the standard position. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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