Are serious about soldering a race pack
Purchase a Miyachi Inverter welder, or an AC model Mitachi with at least a 3500amp rated transformer to weld the cells to nickel interconnects, or bump the power to 5000amp and do it with copper foil using tungsten electrodes.
When you're done with it, you can sell the setup to the next hillbilly ready to light their pants on fire
Saft? those frogs can't provide you with intelligent advice on how to assemble a safe and reliable pack. There's a lot to learn about stud cells, and they're not intended for mechanically supporting the cell.