Calculation mode null of average of output when closed-loop control in seam

摘要

PROBLEM TO BE SOLVED: To improve reliability of management of a welding quality by taking a sampling period over the whole period of one of the seam welding sequence so as to reduce the sampling timing deviation due to a time lag. ;SOLUTION: A seam welding sequence S2 to a welding head is actually obtained in a fixed time delay decided with the circuit constituted from a set seam welding sequence S1. The calculation of the average value of the voltage actually applied between welding heads at this time is executed so that a sampling voltage is obtained by sampling the active period shown with a sampling timing signal ST1 (1). In this case, a number of sampling is subtracted by the part corresponding to the inactive period and the average value is calculated.;COPYRIGHT: (C)1997,JPO