The battery builders club 2

[SternWake]

I was able to weld 0.25mm worth of copper, using brazing paste, but no steel sandwich, using gear 850( of 999) 0.15ms preheating, double pulse with a 4ms interval between pulses using my AwithZ P20B 14.6 kW welder, which is about 240$

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Spot welding Copper / Copper Nickel / Copper Stainless Steel Sandwich

Ok, I am set up in the Air conditioning, as opposed to my insanely hot workshop in the garage, and experimenting with the AwithZ P20B, and 0.2mm copper, No nickel sandwich, no flux. @glyphiks and @Pecos showed interest in not having to use nickel or nickel plated steel sandwich, with Pecos coining the ‘raw dog copper’ verbiage and future band name, in another thread. I worked up the gears until it started sticking, slightly, and was up over gear 500 (999 max) before that occurred. Closer to …

I can weld 0.2mm copper without flux too, but I don’t feel 0.2mm copper is strong enough, it tears pretty easily.

Stacked 0.25mm copper however did feel strong enough on its own.

I believe even spot welders with less power can successfully weld pure copper, especially with the use of the Flux/ brazing paste and/or -0.1mm Stainless steel sandwich.

My previous 21$ cheapo welder was able to do 0.1mm copper, 0,1mm Nickel plated steel and I bet 0.15mm copper would have been in play if I had tried 0.1mm stainless steel instead of 0.1 nickel plated.