Patent ID: 8445809
Filing Date: 2013-05-21
Classification: B23K

Abstract:
1. A welding method wherein a plurality of stacks of workpieces are clamped together in sequence at a welding site between a pair of electrode caps across which welding current is supplied to spot weld together the workpieces in each of the stacks in a series of welding operations in a production run, comprising: pressing the electrode caps against the workpieces in each of the stacks when each of the stacks is at the welding site with an applied force that includes an interjoint force that is increased progressively throughout the production run; wherein the interjoint force at any point in time during the production run is determined as a function of a number of spot welds made and a total amount of energy delivered at a given power rate by the electrode caps up to that point in time in the production run.