Patent ID: 6414259
Filing Date: 2002-07-02
Classification: B23K

Abstract:
An inter-welding electrode moving amount detecting method comprising the steps of:moving a driving section of electrode driving means having the driving section connected to at least one of a pair of electrodes provided to opposed end portions of a welding gun to move the pair of electrodes to a direction approaching to each other: detecting an inter-welding electrode moving amount that the pair of electrodes are moved to a direction separating from/approaching to each other due to expansion/contraction of a nugget when a member to be welded is pressed, electrified and welded by the pair of electrodes; and obtaining the inter-welding electrode moving amounts by adding a moving amount of the driving section to an electrode moving direction due to the expansion/contraction of the nugget during welding and a deflection amount of the welding gun due to a pressing force applied from the electrodes to the member to be welded.