Many components in a resistance welding machine should see 4-6 L per minute (1-1.5 gal/min) of water. This is a very high necessary flow of cool water. The specifications for this water can be found in:
AWS Specification AWS J1.2 Guide to Installation and Maintenance of Resistance Welding Machines
Proper sizing of the electric, air and water for a welder installation is very important. It should be done by professionals. The machine manufacturer may provide specifications for the installation. Contact local qualified installers.
This subject is beyond the scope of the blog.
Reference: American Welding Society - AWS J1.2 Guide to Installation and Maintenance of Resistance Welding Machines