DIY capacitor spot welder
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- Опубліковано 5 жов 2024
- Hi there!
In this episode I will make a simple spot welding machine with electrolytic capacitors. Let's see if it's any good.
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6800uF 25V capacitors: s.click.aliexp...
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Good stuff Sorin. No shame in posting a semi-failure, when there are useful things to lean from
I love how you explain your thought process, then take us through your troubleshooting. Well done.
Maybe using a well suited switch, that can deal with the arc, breaking the circuit at one of the electrodes?
I really love your work and your channel. So fresh, so honest. Please, keep it up.
Hi. a switch will work only if it's rated at more than 100A and even then it will waste a lot of energy.
@@Sorin_DIY what about a mosfet ?
@@Sorin_DIY That means that I am just "nerder" than I thought. I'm gonna keep attached to your channel and learn more before posting again! 😉😜
@@Sorin_DIYyou could use maybe 3 relays in parallel or a thyristor which is the relay responsible for starting a car engine which can handle a massive amount of current and sparks
Even failures are good to know, small piece of knowlege i didn't now i needed
Great video in my opinion. I've looked at a lot of different designs on UA-cam, and hardly ever does any designer/lbuilder tells us about the limitations of their creations. Very helpful..
I tried a tutorial from another UA-camr and I accidentally made a bomb. The one you made with the kit is much safer.
What did you do?
What did you do?
@@xwatchid He is gone. He tried it again.
Excellent video. Couldn't have been more precise.
This was very helpful to me. I have had several unsuccessful attempts, now i understand why
😂😂🤣🤣
It's still useful, now we know what's not to try...
Excelent and a real video. I'm trying to do the mine with no sucess . I am using a 70 mF similar to a beer can (but with only 65 mF), a source 14 volts / 3 A and for the terminals I'm using a tungsten electrode used on TIG welding.
Hello Nerds. It is much more helpful to show things that don't work, as to fake something. Nice to see.
this guy is a certified G
Have an hard insulation sleeve (Ceramic ) on one eletecode, with a groove in it, the presser electrode, slide the other ekectrode down the groove, to make two welds. Just an idea. Fixes gap between welds, and ensures metal are in close contact before current comes,
Really like your DIY electrode. I've been putting pieces together to do this and just waiting on my LSUC caps from Korea. I have 6AWG (16mm2) silicone cable for the cables and have been thinking about how to make the electrodes
You could make a foot switch out of 2 good sized blocks of copper and connect is in series with one of the probes. Cool
Hi. a switch will work only if it's rated at more than 100A and even then it will waste a lot of energy.
Wonderful test & explanation
Hi sorin
I think it could be better if you use a foot switch so you can make sure that the contact is good then discharge the capacitors
and thank you
Hi. a switch will work only if it's rated at more than 100A and even then it will waste a lot of energy.
There are 2 Sorins videos i love to watch... One is you & other is from UK, "Electronics Repair School" channel
I love it! I had a couple of good laughs. And I know you are onto something, looking forward ...
I still found it helpful. This category of videos could use more trial and error type of uploads.
Thanks 4 share
Thank you for sharing your video.
from Australia
Thank you for the video friend i got an idea for a project after watching it.
i love how honest you are ( thank you for wasting your time watching this video ) XDD glad to see people honest
Always a pleasure watching your videos !!
This is a good video so we can avoid making electronics mistakes. Sorin, is there a way you can make a DIY bench power supply that also works as a spot welder using a used PC power supply?
Thanks! At the moment I have other videos planned but maybe I will try it in the future.
Thanks for wasting our time sorin, I love it. 😍
Thanks, I have a kit with a lithium battery but it's not giving me enough power. How would I find the maximum voltage or current that can be regulated ?
hi. it depends on what type of battery you have, what configuration, what type of cells, how many cells?
Nice capacitors 😂
Sorin, wasting time with you? No, please don't use this kind of sentence and don't think about like that, many people waste his time without any mouvements. Thanks for your courageous effort and works which make our lives plentiful.
I was thinking of using dc caps 400v 600 uf. They are found in the outside unit of old air conditioners
They are not powerful enough, you need supercapacitors.
Rather go for low voltage high capacitance. Q=CV So Q is the charge and if you make C high you can use low voltage. V high is dangerous, especially if you are holding the two electrodes.
Thanks brother love u from india, Punjab district Amritsar
Thank you for your channel, I learned a lot with your videos 😊
LOL awesome video
Actually it worked, just need a spring loaded mechanism on tip of electrodes. I am very tempted to make this thing
The capacitors u used are foil wound ie they also have inductance which slows the rate of current change.... if each capacitor had an additional 10 uF Tag Tantalum capacitor sitting across it that would shartpen up the pulse quiet noticeably. Worth a try ?
Very informative
Bro i sent you an email do check it and respond if possible
😂😂😂 no problem bro
Least you admit it 😂
Not useless! We had "Fire Works"... 🤣
LLAP 🖖
Thank you , It was interesting
You can use a foot switch so when you have placed the electrodes in place. You can control the current easily
In regular spot welders the foot switch operates the mosfets, which will deliver 100A or more. a foot switch cannot directly handle 100A or more. So in my project the foot switch (or any switch) cannot handle the peak power of the capacitors.
learning from mistakes is good , it would take you to another level :D GG
Like button to the cat!!!🤣🤣🤣
Failures are learning exp!
Sorry I'm late btw nice vid👍👍👍
Huge fan since 2018
Awesome video as always
5:47 i enjoyed it😂😂😂
Great video.
You're awesome man😊
Hello sir, I want to clear a doubt that can we use a timer delay module to get the right amount of spark needed for welding.
İm thinking how to do spot welder and New video.thanks 😅😊
add a relay in one of the electrodes and control it with a switch
I could not find which MOSFET circuit you used for the final part of the video. It seems it controls / limits the current, so it might be designed to be continuously driven by a 12V battery or some similar high current power source, capable of 200A~300A. Obviously a capacitor bank just provides a current peak, decaying exponentially and probably tripping an eventual current limit of the circuit. But the energy of the capacitive discharge is not enough to spot-weld the parts, and the instantaneous power (peak current) is counteracted by the current limiting circuitry.
Another point to remind: the energy stored in the capacitor, E = 1/2 x C x V^2. It means that welding ENERGY at k12V (final part) is less than half of mid -video voltages (15-18V).
Bottom line: you might have succeeded if using a engine-cranking 12V relay, and eventually increasing the bank of capacitors, and/or increasing the charging voltage (as 18~20V) where the relay contacts will probably survive up to 300A peak, but that MOSFET circuit is NOT recommended for a capacitive discharge.
Hi. I used the module from my spot welder video: V8 Spot welding kit: s.click.aliexpress.com/e/_AYYhHD
I have similiar experience with 8x Nichicon KMH 22000uF/63V from Ali (after measurement they have 12-15mF instead of 22mF, but they have thicker leads). at 21V the discharge is so vivid it melts both testing nickel strips but won't join them together, as you explained. I ordered similiar controller with 5 Mosfets so I will see how this will work (today got bargain for 8,5USD for bare controller). I hope this will be enough to work smoothly.
I connected capacitors with 4mm2 copper -you have 2,5mm2, won't this choke the current too much?
There is also this white "joiner" - isn't this the limiting current in your solution???
Won't be simple diode better protection of your charger rather than resistor?
Great movies! Keep inspiring people :)
Hi. Thanks for watching. The current is drawn from the middle of the 2.5mm2 rail. so 4 capacitors are connected to a pair of 2.5mm2 wires and the other 4 capacitors to "another" pair of wires, the wires join at the middle in the white connector. each pair of 2.5mm2 wires carry half of the total current.
in the white connector the 2.5mm2 solid wire is bended in 2, so it forms a 5mm2 solid wire. and it touches directly the lead wire for about 1cm, so it transfers the current directly to the lead wire, the connector holds them together and also helps a bit with the current transfer.
A diode is not enough, it will be shorted and probably burn.
@@Sorin_DIY Good point with resistor rather than diode! Thanks!
What if you add a plastic "tip" on one pole.. like a fork, so you have something to press down and just place the other pole next to it? Or place a small piece of kapton tape that you can pull under one lead to have it as close as possible before connecting the loop?
It will probably weld a little better. but welding the batteries will take longer.
Can I ask when and why you switched from your 18650 charger to the opus?
Cheers
Hi. I use both chargers for charging and discharging lithium cells. but to test the capacity I can use only the Opus charger.
Dacă chiar îți dorești poți pune un ne555 ca delay si un relay de 200A problema e că : trebuie sa lași pini liberi pentru condensatori ca sa poți seta amperajul corect 😂 și tot nu o sa lipească la perfect 😁🤭
Any chance for the follow-up video?
I bought 2 & 4F supercapacitors, but they are weak for my plans. I need to buy more powerful and... more expensive supercapacitors.
If the issue is with timing, then can a switch (e.g. a switch and a high current relay) to fire the spot welder when the electrodes are firmly place help?
yes, but that's exactly what a mosfet does.
It is always good, to learn what Not to do, before
doing it yourself. That would be a waste of time. 😁✌🖖
Can I use 16V capacitors instead?
Yes, but you cannot exceed 16V on the power supply.
Oes all the capacitor have to be the same size?
No, but they need a minimum voltage rating and the capacity as big as possible.
Where is the supercapacitor video?
I bought 2 & 4F supercapacitors, but they are weak for my plans. I need to buy more powerful and... more expensive supercapacitors.
use a relay and a peddle
Hi sir Can i know In which field you study ? Pls answer me
Hi. I took a few basic electronics classes in school. and later I studied electrical engineering at a local University.
@@Sorin_DIY thank you so much to answer me
If you have a weak spotwelder use 96% pure nickel strips
_"Thank you for wasting your time..."_ It's UA-cam; that's what it's _for!_
At least the cat is cute.
Upload more frequently.
It's nota waste. I learned something
if your only joining lil battery s its gank
Frate nu mai spune chestia...
maybe it should have a switch like a starting relay of motors to pre position the probe before releasing the capacitor charge.
Yes, that is a solenoid switch.
thank you for your failure, at least i dont wasting money and my times soldering my capasitor
Quite disappointing!