I plan to use a soft copper sheet 0.1x7-8mm samsung 25R welding cells , if only welds are strong enough. For this section of copper 0.7-0.8mm ^ 2 amps max is 15-17Amper, for comparison, pure nickel 0.15x7mm is 4,7Amper, nickel plated steel 0.15x7mm is 2,3Amper