I bought Aulakiria's LiPo based spot welder, he has tested 0.20mm nickel with no issues. I'm still waiting for the foot pedal to show up from eBay though. That said, neither of these devices are intended to spot weld thick copper (0.25mm). One of the main things people mention in a thread I pasted below, is that at the energy levels required to spot weld that thick of copper, you can potentially damage the battery cell.Occam's Laser wrote:I'm looking into getting four malectric, open source car battery powered spot welders.
More info on them here: https://malectrics.eu/product-category/ ... ot-welder/
They have an "auto pulse" mode where they automatically fire a set time after an electrical connection is sensed. I need more current than just one of these things can handle, enough to weld .01" copper.
I'm intending to connect each of the four leads of the four spot welders to a common tungsten tip and run them in parallel for 4x the current.
Is this a terrible idea? My gut tells me yes but I can't think of a physical reason for why it won't work.
If you can explain the physical reason for why this is a terrible idea let me know.
Sams post was from 4 years ago.kdog wrote:Hey Sam
Here are my answers to your qs, not by any stretch the only answers. Too many variables without more details but anyway..
For my AC single pulse spotwelder...
1) depends but btw 2v and 20v. Most AC welders would be about 2-4v I use 6v. Cd welders are variable.
2) depends but about 800-1000a min. I'm at about 1500, stronger units do 2ka or more.
3) depends on the above two, and what you're welding. My AC wave form requires longer pulses at 20-80ms. DC current spotwelder are shorter like 5-30ms or something- don't really know cause I'm not using one.
4) between 2-8mm I'd say. But you can do wider, it's just not usually necessary.
Short and sharp and hot is the go
All ball park figures ottomh-not necessarily optimum.