The evaluation device and evaluation program and its evaluation method of resistance welding, as well as control device and its control program and its control method resistance welding method, resistance welding member, resistance welding machines, resistance welding machines

摘要

PROBLEM TO BE SOLVED: To provide a resistance welding method, by which quality stabilization or efficiency in resistance welding such as spot welding is improved.;SOLUTION: The resistance welding method includes: a calculation step of calculating a resistance ratio X (R2/R1) from a first electric resistance value R1 of a to-be-welded material, which is measured just before completion of Joule heating and from a second electric resistance value R2 of a to-be-welded material in a remaining state of heat; a determining step of comparing the resistance ratio X with a predetermined threshold Xn and making determination; and a re-heating step of conducting Joule heating again when the resistance ratio X is smaller than the threshold Xn. Thereby, a nugget is certainly formed which is formed by melting and solidification of at least a part of a weld portion of a to-be-welded material, so that a welded member that is subjected to stable resistance welding is provided.;COPYRIGHT: (C)2011,JPO&INPIT