1. A method of monitoring a resistance welding system comprising the steps of: a) providing an electrode having a movable pin supporting an object to be welded; b) measuring a parameter of the pin; c) determining a welding operation parameter from the pin parameter including determining at least one of a weld collapse acceleration, a weld set down distance, and an upset distance; d) comparing a present welding operation parameter to a learned welding operation parameter; and e) setting a weld fault with the present welding operation parameter being undesired relative to the learned welding operation parameter.