Resistance Welding Transformers
Trusted Power. Proven Performance. Global Excellence.
G.E. Schmidt is proud to represent RoMan Manufacturing—one of the world’s leading manufacturers of water-cooled resistance welding transformers and power supplies. For decades, RoMan has set the industry standard for quality, reliability, and engineering excellence, earning the trust of automotive manufacturers, industrial fabricators, and welding professionals across North America and around the globe.
Comprehensive Transformer Solutions
RoMan designs and manufactures three categories of water-cooled transformers to meet any resistance welding requirement—from delicate spot welds to heavy projection welding applications:
MFDC/Inverter Power Supplies – Compact, lightweight, next-generation technology ideal for robotic welding and projection applications. Available from 35 to 250+ KVA with secondary currents exceeding 500,000 amps for large projection welds.
Fixture Type Transformers – The perfect choice for multi-spot welding fixtures. Built to RWMA specifications with industry-standard staggered secondary lugs, these flexible units range from 25 to 200 KVA and adapt easily to custom applications.
Machine Type Transformers – Robust, water-cooled units for press welding, seam welding, rocker arm machines, and cross-wire applications. Available from 20 to 500 KVA, conforming to RWMA standards with bus bar or laminated shunt connections.
Engineering Excellence You Can Count On
RoMan transformers integrate seamlessly with any brand of welding controls, weld guns, or robotic systems. Available in various primary voltages, frequencies, and secondary voltage configurations, each transformer can be customized to your specific application requirements. With options for remote-mounted switchgear, tap switches, over-temperature protection, and specialized accessories, RoMan delivers solutions engineered for long operating life with minimal maintenance.
Contact G.E. Schmidt for technical specifications, application engineering support, and competitive pricing on RoMan resistance welding transformers—the global standard for industrial power conversion excellence.
MFDC Transformers
RoMan’s medium-frequency direct current (MFDC) inverter power supplies represent the cutting edge of resistance welding technology. Operating at 1000 Hz, these ultralight units deliver superior weld quality with exceptional energy efficiency and precise current control. The compact footprint—significantly smaller than traditional AC transformers—makes them ideal for robotic integration and tight fixture mounting. MFDC technology provides faster welding times, reduced heat-affected zones, and improved weld consistency across dissimilar materials including aluminum, coated steels, and advanced high-strength alloys. Available in 650-volt configurations with multiple secondary voltage options, RoMan MFDC units deliver the performance advantages demanded by modern automotive and aerospace manufacturing.
RoMan: The Automotive Standard
RoMan’s automotive-grade transformers meet the rigorous quality and performance standards required by global automotive OEMs and tier suppliers. Designed for high-volume production environments, these transformers feature enhanced duty cycle ratings, superior thermal management, and extended service life under continuous operation. Built to support advanced body-in-white assembly processes, RoMan automotive transformers handle everything from aluminum closures to ultra-high-strength steel structures. Each unit undergoes comprehensive testing and comes with full documentation for ISO/TS compliance. With proven performance in millions of welds across assembly lines worldwide, RoMan transformers deliver the reliability and consistency that automotive quality systems demand, backed by responsive technical support throughout North America.
AC Transformers
RoMan’s AC resistance welding transformers provide versatile, cost-effective power solutions for both fixture and machine-type applications across a wide range of industrial welding needs. These robust water-cooled units conform to RWMA standards and offer multiple secondary voltage selections for optimal performance in your specific application. Fixture-type models feature convenient primary access for easy integration into multi-spot welding systems, while machine-type transformers connect seamlessly to your welding tooling. Standard features include over-temperature protection, efficient water cooling, and compatibility with all major welding control brands. Whether you’re running spot welding, projection welding, seam welding, or cross-wire applications, RoMan AC transformers deliver proven reliability and consistent performance across diverse manufacturing environments from small job shops to high-volume production facilities.
