Anyone wanna let me borrow their spot welder? 
Ill use my own battery so u dont have to send one and ill send u pics of the battery before it gets used so you can verify that it wont harm your spot welder! Im planning to weld .2 nickel on 21700 batteries
What is your location?
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Ohio! Zip 44221
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I take it the spot welder you used on your fishpaper ringless experiment, was maxxed out power wise?
If so, the battery might be a part of the issue.
The spot welder is basically shorting out the battery for 0 to 99 milliseconds, and the strength and health of the battery has a huge effect on the result, as does the wiring from battery through welder, to probe tips.
The pressure used on the welding pens is also a bit opposite of what one thinks. More pressure is not necessarily better.
I do not have huge experience, and invite those with far more to chime in.
I like to press one probe, then lift, press the other forming indents, then both at once using less pressure.
Too much pressure leads to poor welds in my experience.
Too little pressure leads to welds that look too hot, on the exterior, but don’t necessarily penetrate the can.
There is a goldilocks zone, and the pics you show of your removed welds, in your other thread, look like far too weak to my in-experinced eye.
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Sure was maxed out lmfao. Was a cheapo amazon one that worked well for my 18650 build but did not hold up to the 21700 build. I dont wanna spend almost 200$ for something im gunna use maybe once so figured id come and ask to see who will let me borrow theirs! Hell ill ship batteries and pay someone to weld them if need be lmfao.
On the pressure thing, yes too much pressure can lead to crappy welds and can also damage the welder tips but slight pressure (like very little pressure) is necessary for a strong weld. Just gotta know how to control your own strength lol. And yea the pics i showed were of the p-groups that didnt weld great and im glad i tore them apart or else id figure out the hard way that they were bad
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Fwiw, and again, I have onky a little experience, your welds looked almost too hot, and when you ripped them off due to lask of fishpaper rings, they looked too cold, too weak.
Little dots remaining, instead of torn shredded obstinate nickel.
I have two cheap spot welders, but massaged with thicker copper for lesser resistance from, through, and into, and of course back.
Same weld battery, one welder does in 50ms what required a 75ms pulse from the other.
I too wished to pretend what looked adequate, indeed was.
I found out the easier way, that it was not.
Your forgetting of the fishpaper rings was actually a blessing, as the your welds appeared, to me, to be far from adequate, once you ripped them off.
I hope those with far more experience chime in, and help prevent future readers from making and accepting, and putting into service, the mistakes we made, before we knew better.
Just know using your existing battery, on a better welder, might still be too weak.
The Kweld gold standard welder, using joules, instead of a defined timed pulse, could negate a lot of what i have typed.
Your existing welder might just want another battery, in parallel.
Again, I hope the more experienced chime in, and I will gladly delete anything written that is disapporoved of.
Making batteries is dangerous.
Bad information is dangerous.
Ego, is dangerous.
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