Patent ID: 6747235
Filing Date: 2004-06-08
Classification: B23K

Abstract:
A welding apparatus with welding electrode rollers, an AC welding current source that is selectively connectable to the electrodes by a controllable switch arrangement, and a control device for the switch arrangement, characterized in that:a means connected to the control device is provided which is triggered by the deflection of at least one of the welding rollers caused by the article passing between the electrode rollers; and wherein the control device is configured to receive from the means a signal indicating the edge of the article to be welded has entered between the electrode rollers and in dependence thereon to deliver to the switch arrangement a signal releasing the welding current to the electrode rollers; and wherein the control device is configured to receive from the means a signal indicating the edge of the article to be welded has exited between the electrode rollers and in dependence thereon to deliver to the switch arrangement a signal to discontinue the welding current to the electrode rollers.