Benefits of Closed-loop Control in Resistance Welding

This technical application brief outlines the advantages of closed-loop resistance welding power supplies, which utilize current and voltage feedback sensors to enhance the welding process. It describes how these systems provide controlled heating rates, repeatable weld heat, and continuous heating, which are essential for achieving consistent welds, particularly in challenging applications. The document details various feedback modes, including Constant Current, Constant Voltage, and Constant Power, each suited for different welding scenarios. Additionally, it discusses the importance of weld monitoring capabilities, which allow for real-time process analysis and quality control. Advanced process tools such as the Pre-Weld function and Active Part Conditioner (APC) are highlighted for their roles in detecting part misalignment and managing surface oxide levels, respectively. Overall, the brief emphasizes that closed-loop technology is increasingly vital for meeting the rigorous demands of modern resistance welding.