Dean’s Certified Welding has decades of experience performing welding operations in tunnels, shafts, and underground pipeline environments, including some of the largest tunnel projects in the western United States and Canada.

Our tunnel and shaft welding work includes steel-lined tunnels, deep access shafts, and underground pipeline systems with diameters exceeding 190 inches. We regularly weld thick-wall steel pipe ranging from ½ inch to over 2 inches, including complex configurations such as tees, crosses, elbows illustrating robust on-site fabrication.

Projects like the Arrowhead Tunnels, San Vicente Tunnel, Seymour Capilano Twin Tunnels, Lake Hodges Tunnel, and Rondout Tunnel demonstrate our ability to safely execute high-volume welding in confined spaces while meeting strict inspection and testing requirements. Our crews are trained to work efficiently underground without compromising weld integrity or schedule.