Electrode-misalignment detection device in resistance welder

An electrode-misalignment detection device in a resistance welder configured to join joint members together by holding the joint members between opposing electrodes and applying pressure and electricity to the joint members, the electrode-misalignment detection device comprising:

• an electrode misalignment detector configured to simultaneously approach outer peripheries of both of the opposing electrodes in a state where the resistance welder is located at a predetermined position so as to detect misalignment of each of the outer peripheries,
• wherein the electrode misalignment detector comprises
• a clamping member movable toward the outer peripheries of the both of the opposing electrodes to clamp the opposing electrodes from opposite radially outer sides of the opposing electrodes, in a state where the resistance welder is located at the predetermined position, and settable in a predetermined closed state in a case where each of the opposing electrodes is located at an appropriate position,
• a signal generator configured to output a movement state signal according to a movement state of the clamping member toward the outer peripheries of the opposing electrodes,
• a non-closed-state detector configured to detect that the clamping member moved toward the outer peripheries of the opposing electrodes is in a state other than the predetermined closed state based on the movement state signal from the signal generator, and
• a misalignment determiner configured to determine that either one of the electrodes is misaligned in a case where the non-closed-state detector detects that the clamping member is in the state other than the predetermined closed state.