Patent ID: 7173209
Filing Date: 2007-02-06
Classification: B23K

Abstract:
1. Method for welding an overlapping article of sheet metal on a welding apparatus with welding electrode rollers and if required with additional intermediate wire electrodes, characterized in that the welding current is not applied to the electrodes until the article to be welded is between the electrodes, the moment of switching on the welding current being derived from the forward or rear edge, in the welding direction, of the article to be welded, the moment of switching being derived with respect to the forward edge by detecting the deflection of at least one of the welding electrode rollers relative to the other roller upon insertion of the article between the welding electrode rollers, and the welding current being applied to the welding electrode rollers at the next passage through zero of said current following a predetermined, adjustable deflection of said rollers.