For spot welding application, there are two cooling circuit/requirements you need to calculate.
The first is the cooling for the weld controler. The other is the cooling for weld guns and transformers. your equipment supplier should assist you to decide the requirements of the cooling system...
I am working on a floor and the material specs are something like :
WSB-MIA215-F1 Coating 50G50G-EL
or
WSB-MIA348-A5 Coating 50G50G-EL
Could someone help me find out these material or point me to where I might be able to get it.