RT's Mobile Welding We're on the move for you RT's welding, for 10 years has been your premier source for metal fabrication in Northern California. We are the company that can cater to your needs, whether industrial or commercial res.. All rights reserved. Your source for quality steel fabrication and installation RT's welding 4190 Mother Lode Dr Shingle Springs, CA 95682-9750 (530) 677-1626