METHOD OF CONTROLLING WELDING CONDITIONS OF A RESISTANCE WELDER

摘要

The invention concerns a method of controlling welding conditions of a resistance welder, in which the nugget generating state can be estimated with general-purpose properties, and in which accurate and high-quality resultant welding can be obtained. Through a process including the steps of detecting a welding current and a chip-to-chip voltage, using a heat conduction simulator for performing simulation of a welding portion on the basis of heat conduction calculation from the detected welding current and the detected chip-to-chip voltage, estimating a status quantity expressing the state in which a nugget is formed in the welding portion during welding, and comparing the status quantity with a reference status quantity at the time of estimation, wherein correcting the welding conditions and modifying a configuration of the heat conduction simulator in such a way that a numerical value thereof is corrected on the basis of a monitored value expressing a state of welding after welding are performed on the basis of the result of comparison so as to make said status quantity coincide with said reference status quantity, it is possible to control the welding conditions accurately, and it is possible to obtain accurate and high- quality resultant welding.