Transformer replacement or upgrading will depend upon the type of machine or robotic gun that is involved. The electrical system and physical systems must also be considered.
PRESS WELDER AND TRANSFORMER
SERVO ACTUATED TRANSGUN AND MFDC TRANSFORMER
The process to change out a transformer varies by machine and application and is beyond the scope of this blog. Consult with local Machine builders and Distributors in your area for the best input on how to replace or rebuild equipment.
References: AWS Standard J1.2 - Guide to Installation and Maintenance of Resistance Welding Machines