The UR WELDER IDP Series HFDC Resistance Welding Controller features advanced inverter technology with five selectable operating frequencies (1–5kHz) and six intelligent welding control modes, including constant peak current, constant secondary current, constant voltage, constant power, constant pulse width, and hybrid control. Equipped with an intuitive touchscreen interface, the controller integrates oscilloscope and welding quality monitoring functions, displaying eight real-time waveforms of current, voltage, power, resistance, and other welding parameters. Its intelligent quality judgment system simultaneously monitors instantaneous and average values of current, voltage, and power, along with electrode pressure and displacement, supporting adjustable upper and lower limits, pressure triggering, and displacement-based welding interruption. A powerful built-in database stores over 5 million welding records, with convenient USB export for complete quality traceability. Multi-stage welding control with adjustable current rise and fall times helps minimize welding spatter and improve weld consistency. With over 20 fault diagnostic and protection functions, comprehensive alarm monitoring, flexible I/O interfaces, and RS-232, RS-485, and Ethernet communication capabilities, the IDP Series is designed for precision resistance spot welding, automotive manufacturing, robotic welding systems, and industrial automation applications.