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A 100F Supercapacitor charged to 2.6V (that's 338 Joules) discharged into some Nickel strip (0.15mm thick) pressed onto a steel base plate. Will it spot weld?
A 100F Supercapacitor charged to 2.6V (that's 338 Joules) discharged into some Nickel strip (0.15mm thick) pressed onto a steel base plate. Will it spot weld?
any fool can see this is a stupid idea!,stupid to even think a microswitch can handle the amps!
Hi Ya . Im a sheetmetal worker and done a lot of spot welding . The copper tips allow the current to flow its the resistance between the faces of the steel that causes heat and a localised weld .The copper tips do wear down but never melt and will NOT adhere to the material . The above info is for a traditional spotwelder pressing equally from both sides . I will guess that the battery spotwelder welds where the metal spots are in good surface contact ie 2 spotwelds at the same time . Hope this give a little help. regards Don.
Oh dear. This video reminds me of when I was in my teens (several decades ago) and a friend of mine, who was kind of an electronics prodigy, had got hold of a small diode laser (I don't remember if it even had any collimation optics). He said that the laser should produce something like 6000 degrees C of heat. But none of the "experiments" with it melted or burned anything. I was kind of perplexed. 🙂
All your system is problematic, the wire width is more suitable to 10A than to 200A …. also the microswitch is not suitable, probably also the super capcitor resistance , (some of them have 20 mili ohms resistance, while other have 0.3 mili ohms – need to read datasheet), by capacitor pin structure this is 10 mili ohms or more
Julian: Please learn only "a littlebit" of Electrics an then try again. This what i see is (Sorry) Bulls***. Cap: To small Cable: To Small an the Microiswitch: What do you think why all other use Mosfets and Timer ?
Stick 6 in series and you'll be winning
Just use a 300+F cell. Below 300F, most manufacturers can't maintain a low ESR. For instance, a 300F cap from skeleton has an ESR below 1 mohm.
Comedy of errors end to end. Use 2 leads so you can control where the energy is dissipated, and try thin stainless steel strips. Holding the switch more than 1/100th of a second is pointless. If it hasn't welded in that first 1/100th of a second, it's not gonna happen. As for the resistivity – the ratio of the resistivity is the ratio at which the metals at the interface will heat at. The copper has nearly 500x lower resistivity than stainless steel, so the stainless steel will be a puddle long before the copper begins to melt.
Al has oxide layer that makes it possible to weld only in inert gasses. What you use to charge capacitor?
You are wasting all the energy trying to heat up the wire and steel plate. You need 2 electrodes. EDIT: What Eric Skaar said.
Whether an April Fools (in August) or a Julian Ilett brain fart, it doesn't matter – the discussion that this attracted is fantastic and makes this whole "venture" really worthwhile. I learned far more about this topic from this failure than from any of the successful attempts I have watched.
Thank you Julian. Another great contribution from you.