DIY Arduino Spot Welder V3
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- Опубліковано 1 вер 2017
- You can get parts or prebuilt kits of the spot welder at: malectrics.eu/
Project Files: (BOM, Arduino Code, PCB Files ...) github.com/KaeptnBalu/Arduino...
Build Guide: www.instructables.com/id/DIY-...
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Version 3 of the Arduino Nano based Spot Welder for battery welding
This Spot Welder can be used to weld 18650 batteries. It uses a 12V car battery as welding current supply. Typically one 40Ah 440A battery delivers enough current to get good welds with 0.15mm nickel strips and even 0.25mm nickel strips. For thicker nickel strips maybe you will need bigger battery or two in paralell.
The Welder generates a double pulse, where the first one is 12% of the time of the second one by default. Pulse time of the main pulse is adjustable by the rotary encoder and displayed on the screen in mS so you can exactly adjust the time. Its adjustable from 1 … 999 mS.
Project Files: (BOM, Arduino Code, PCB Files ...) github.com/KaeptnBalu/Arduino...
Build Guide: www.instructables.com/id/DIY-... - Наука та технологія
Just got mine today, along with the cables and the fuse. Hooked it up to a 12 volt 840 MCA deep cycle marine battery. Welds are perfect! Love the auto pulse feature.
Thanks for such a well designed and useful project - my one arrived today and I'm very happy with it
I can't believe how long it's been since I've wanted (needed) to get one of these!
I'm ordering one tomorrow!
Got it today! Thanks for the gummy bears!
Received it last night. Set it up tonight and works well. Daughter appreciated the gummies ;) thanks
I just ordered a complete kit from you today! I'm very excited.
very impressive, I will order one soon, thanks to Well Done Tips for pointing this out
I have the version 2.2 welder and it works great. I used it to build 2 x 80 cell lifepo4 battery packs. This makes quick work of putting packs together compared to soldering. The smaller 18650 cells can be soldered but the larger lifepo4 cells can be next to impossible to solder , thats why I bought this welder.
I highly recommend it to everyone who puts together battery packs, I been using it connected to a fullriver 28 ah agm battery, that has plenty of power to run this welder. While small in size it has power to spare. I got good welds at 1.4 setting, and the settings go all the way to 9.9, the higher the settings the hotter the cables get when welding. Always start at the lower setting and slowly go higher until you get good welds that don't come apart.
If you build your own welding cables, use 6 gauge copper welding cables, when I was using 8 gauge audio cables to weld, I had to use power settings between 4.0 and 7.0 and even then It wasnt sticking good, and the cables got too hot to hold after 10 minutes of welding. Copper welding cables made all the difference.
hi . can u recommend a part number for through hole diode for replacing SMAJ13A
Got mine today. Excellent service.
i have this version and it is a joy to use
tnx man i love my spot welder and use it every day for my little shop, tnx man wil order some cables from u soon doubt like the cabels i have now
Hi! Thanks for a nice product! I started up my V3 spotwelder today and I got perfect welds straight away :) Maybe my powersource is a bit to much, its an 760CCA battery, so the lowest setting of 3ms was enough for very strong welds in 0,15mm nickel.
@John Smith Okey! After some testing I uped the puls to 5ms. I get holes in the nickelstrips if I pull them of my batteries after welding, so that must be good enough. :)
I purchased one of these about 2 yrs ago, love it! Recently, I acquired an old auto jump pack and decided to convert it and use it as an enclosure for this welder. Rewatching this video, I notice that you recommend not making the weld leads any longer than 50cm, I'm still using the original leads so I think I'm OK but at the back side I have lengthened the leads to where it attaches to the battery, is that OK or can I damage my unit???
I’ve still got my V2. Not used it much, but it is great. Every job I have done it worked flawlessly.
I’d like the V3 just because it is so nice
My only complaint , that I rectified on my V2 was to take the board off the lead acid battery terminal and print a box for it.
I just don’t like the idea of the board hanging off the battery terminal.
If I do get a V3 I will have to draw up another box and get the rotary encoder on the end of some ribbon cable
saw in other vid if its at 12v itlll set off a nice firework and ik what you mean. But how would i fix this?thanks, mines at 12v
I'm using a 6ah lipo with 60c discharge. I can't get my .3mm nickel strips to weld onto the battery even with a 70ms pulse time. Do I need a lipo with higher discharge?
Has the mosfet board changed much since v1? I’m hoping I can upgrade it with just pcb and some other parts.
For thicker nickel belt, just use a big capacitor to enhance the current.
Can you explain where to connect the capacitor and of which specifications?
Hi, I couldn't find the gerber files of version 4.
Bought the Malectrics Spot Welder for my 52v - 1500watt ebike kit...Man oh man does this work "'great". I should have purchased the Lipo battery because taking the battery out of my vehicle is a pain in daArse..
hi my car battery is12v with 630amp isit ok for spotwelder?
very nice and helpful!
sir can we use computer ATX as a power source instead of the battery for such a fantastic spot welder
Have just received version for Car battery but thinking, is it possible to use it with 3s4p Samsung INR18650-25R If I have 6mm2 cable or bigger to the battery.
How can I order one without paying 10k shipping because I'm in the UK?
Hey, just wondering... are there plans to incorporate the new Arduino Nano RP2040? or would the code already work on it?
Thank you!
Coole Arbeit. Echt genial. Ich habe noch ein selber gebautes Kondensator-Schweissgerät. Denkst du mit dem Arduino V3 könnten sogar Kupferstreifen geschweisst werden? Oder geht das wegen den Kupferspitzen nicht?
Kupferstreifen werden wahrscheinlich zu viel Strom benötigen um vernünftig geschweißt zu werden
I just got my v3 kit I am using the same lipo in your video I can only get the negative welds to stick how can I get good welds on both probs
Actually when I spot weld onto the batteries it welds both points when I was testing nickle to nickle only one weld would stick but nickle strip to battery makes great welds
Hello, I like your Spotwelder. How many Amps and Amphours should the car battery have? Kann I use a motorcycle battery? greetings from Osnabrück :D
The best battery size is 600A (CCA). Motorcycle battery will not have enough power.
Top notch.
Hello, what is the capacity of the fuse plugged into the positive pole?
Jean-Francois Diette it is a 300A ANL fuse
Can we spot weld copper 0.2 strip with it. I have a power pack that need to delivers 400 amps for 3 sec. So nickel won't hold that since I will use A123 26650 cell 8S4P.
Yanick Dessureault yes it will. It will do .25 or even thicker
Just received mine recently!
Quick question for you: What would you recommend for spot welding .3 mm nickel strips? I have a 610a 75ah car battery that I did some testing with up to 85 ms w/ 15% second pulse to no avail. Is there something I may be missing? Should I try sourcing a larger battery ( either higher cca or ah rating ) or simply use a higher main pulse or secondary? Thanks for any help!
0.25mm nickel strips work for me on about 30...35mS pulse time with 400 CCA battery. Dont have 0.3mm nickel but i think at 85mS it should weld. Do you get very tiny weld Spots ? If so, maybe your welding tips are to sharp. You can flatten them with some sandpaper or carefully with a hammer.
I grabbed another battery with CCA of 750 and boom! No more TVS diode. I'm looking through your build guide right now and will try using the through hole version you posted. This: www.mouser.com/Search/ProductDetail.aspx?R=5KP13A-E3%2f54virtualkey61370000virtualkey625-5KP13A-E3 is it, correct?
Looks great, just had a look at the schematic, have nearly all the bits already apart from the MOSFET board. The TVS diodes on the MOSFET board have Vbr = 14.4V, which is not that far from the voltage of a fully charged car battery. As they are uni-polar and the inductive spike will always be in forward direction I would have thought that higher Vbr would be preferable and a combination from other suppliers with max If of same order as the design would be OK?
Andy Barnard The TVS diodes are chosen with 14.4V VBR for the reason that these can take the most current. If you take a look in the diodes datasheet you see that the higher the voltage of the TVS diodes is the less current they can take. I also did oscilloscope measurements that showed that with these diodes the voltage spike still reaches arround 30V max. With higher voltage diodes the voltage spike would get pretty close to the mosfets maximum voltage.
But if you do have a good idea for a better way or other diodes to protect the mosfets please let me know. I am always working on further improving the spot welder.
Thanks for the reply, I would not give advice before trying it myself..... 30V - that is some kick - I presume in the forward direction as the inductive field around the high current circuit wire collapses. Shorter cables theoretically better....
I'm pretty sure that the 'max peak pulse surge current' is at the maximum (reverse) clamping voltage - as the voltage rises the current reduces because there is a maximum power limit. In a bi-directional diode, this is also the forward voltage, but you have (correctly) chosen a uni-directional diode and the forward voltage should normally be lower - though 30V is actually higher than the clamping voltage in this case.......
The Vishay data-sheet does not specify forward current (strangely), though other suppliers (e.g. ST Transil 1.5KE range) specify a 'non repetitive peak forward current' for uni-directional devices which is not dependent on reverse voltage even though the reverse clamping current reduces as the voltage increases. For ST Transil, whether I choose a 13V 750A device or a 750V 13A device, max If (forward current) specified is 200A for 10mS.
I need one of these!!! Can I get it without the plastic housings and fuse , wire and foot pedal ? I need like a bare bones base price. I have spent too much $$$ on batteries! Now I need to assemble in packs. I was going to solder. But I'm concerned about overheating!. I was going attempt something similar. After I saw ave blow a hole in a cell! Well my mind changed!! Great video!
You can get just the prebuilt kit on my website: malectrics.eu/
Or even just the pcb set and completely build up the welder on your own.
Malectrics thanks I'll check it out
I do not have a 12V car battery but a 24 truck battery.
Will this work or am I going to have a bad time?
Jeff Bourke The Spot Welder can take a maximum volage of about 14V. With 24V you will have a very bad time.
Hello, did you tried to use capacitors as power source charged by current limited step up?
On the faq page of his shop there is a link to a super cap project.
thats more complicated then I thought... but thanks for that.
I recently received my spot welder from malectrics however when I connect it to a 12V power source the red light on the arduino nano comes on but nothing comes up on the OLED! Any ideas?
Please write a mail to malectrics.info@gmail.com with your order number and maybe some pics of your setup. Then we can figure out what is the problem or sent you a replacement part.
The issue sounds like the Arduino Nano has a problem.
What you could try first is to reprogram the Arduino Nano malectrics.eu/2017/12/13/arduino-spot-welder-software-update-tutorial/ or try with a new one if you do have one available.
OK thanks just trying that now.
Happy to took my order this week :) can i run this thing with an 6S Lipo? Danke für deine Arbeit
It can take 14V maximum. Which means 3s Lipo or 12V car battery only. 6s is way to high voltage.
@@Malectrics thanks :) no problem.. i will take my 6S 8000 mAh and make 2 3S from it. Got some NCR -B how may should i put in 3S to Operate der Gerät from it?
Hi, im wondering why you still have the arduino on there and not just the mcu and USB port?
The Arduini Nano is actually cheaper than the single Atmega328p mcu with a USB chip.
Malectrics huh. Well that is a good reason, even if id prefer that it was integrated it's hard to argue against. Plus you get an arduino.
I just checked the parts list and seems a lot has changed. Would the old mosfets (IRF1405) still work instead of the IRFB7430?
You can still use the IRF1405 Mosfets. Just dont use a to strong car battery with these mosfets.
Thanks. Went to check parts and there is apparently a 48 week lead time on the
BAV99LT1G , can you please suggest a substitute?
Why was the Schottky diode removed?
Does adding the tvs diode to the v1 have any advantages?
The 4 TVS diodes that are now integrated on the mosfet board do a better protection job than the Schottky diode. You could add TVS diodes to the V1 for further protection of the mosfets, but this wont have any effect on the welding quality.
Malectrics thanks for the quick reply. Also I can only find 5kp15a tvs diodes, would they still be ok to use?
I have built mine. Can I use a power supply for the battery
No, you cannot because the spot welder will be drawing 500A at times.
Yeaaaahhh... Arduino Spot Welding POWEEEEERRRR haha =]
Tolle Arbeit!!!
Gibt es hierzu auch einen Schaltplan?
Ja gibt es. Schau mal hier, da findest du alle Infos: malectrics.eu/support/
Das ist ja mal genial. schade das er nicht mit 4s lipos verwendet werden kann.
Hi, i‘ve got some PCBs left
(1oz Regular PCB/2oz FET PCB) and since i don‘t want to throw them away, i want to give them to the Community. If some of you want to build the spot welder on your own, you can have them for almost free(just shipping)
Hi how are you
I used it with the battery nano tech 5.0
Work very good But the think is I get 10 time work and after I have to charge the battery it is normal
Thank you
That is not normal. You should get about 500 - 800 welds out of one charge. Depending on the pulse time setting. Do you have the same Lipo i used in the video ?
Malectrics hi
Yes I have the same one
When I hit 10v is stop working and I have to charge and start working again
Maybe your lipo is not ok. When i recharge after 500 welds. It puts about 3000mAh back into the Lipo. How much does your charger recharge after just 10 welds ?
Malectrics hi
The battery is new
I think is less but not sure I have to look and if is not the battery
What is could be
Thank you
Removed comment as it was posted in wrong video... (schematic had been modified)... apologies
That is true for the latest V3.3. In the eralier V3's there were no resistors on the mosfet board. The 8 Pin Header has all 8 pins only connected / shorted to each other on the mosfet board V3.3 not on the arduino board V3.3. This way the V3.3 arduino board is also compatible to older V3 to V3.2 mosfet boards. If you build a V3.3 welder yourself, you can just bridge R17-R24 with some solder. For more details see: malectrics.eu/pcb-set-v3-3-assembly-instructions/
Nice work, i just got one question, why are you using 8 transistors ?
Let's try with 3 transistors.
I mean let's say that we got 400A, 100 ms time for the double pulse. One pulse per second. and 1.3 m ohm resistor for one FET resistor. so 1.3/3 m ohm for 3 FET in parallel.
We will have 1.3/3*10^-3 * 400^2 * 100 * 10^-3 *1 = 7W to dissipate in total
That might be dissipated thanks to the aluminum part.
One more question, What is the TVS1 diode function ? If it's suppose to be freewheeling diode, i don't see the current path
@@thomaslsr6847 Do be careful to add the power expended when the FET is in the linear domain into your calculations.
Why can't it be sent to Northern Ireland if they are part of the EU's single market for goods?
What is the price in us dollars?
Batteries are too costly and have limited life cycle. Is it possible to use a 12V DC Power supply. If yes kindly write the specifications. Also give complete detailes on how to use Microwave Oven Transformer. In one of your comments you wrote about SSR. If possible make details comment with part no. and schematic.
What is a maximum voltage to operate? Can I use 4s lipo?
Jaroslaw Serafin maximum voltage is about 14V because of the used protection diodes. 4s lipo is not possible, only 3s lipo.
Malectrics Thanks. Regards
Nice work can't wait to test it.
ah sweet i got about 15 4s lipos and 3 3s lipos lucky i got a few 3d laying around might order one soon =)
does it use magnets, as I can't be near magnets
The high current through the cables creates a pretty strong electromagnetic impuls while welding. There are no physical magnets in the device but i would recommend you do not use the welder.
why is my package not coming and it's been almost 10 days ?? europa, croatia in zagreb
i just repleid to your email. We will figure out a good solution to this problem.
Hi I own the V1, and think of getting the V3 and us a LIPO as a car batt takes too much space on my bench, can you link me the right batty model to get, seems hard to find the 5000mah 130C 3S you have.... also can you sell the fuse holder you made?
Is the lipo strong enough for the spot welder... the spotwelder will try to draw more than 130C (650A) on a small spot weld?
Did you try the lipo constantly while making pack with 500 welds and up?
I have this Lipo: Turnigy Nano-Tech 3s 5000mAh 65-130C . hobbyking.com/en_us/turnigy-battery-nano-tech-5000mah-3s-65-130c-lipo-pack-xt-90.html?___store=en_us
It has now done about 2000 Welds on 15mS setting. Lasts about 800-900 welds per charge. So it has only 3 charges on it. But till now no signs of a problem with the lipo.
Thank you and will you see the fuse holder for those who dont have access to a 3d printer? or recommend a pre built one?
Which the charger for the lipo battery
@@Malectrics It's been a while - how did the lipo battery behave in the long run? Did it puff or did it hold? Now that time has passed, would you now say that a car battery would be a better choice or not?
@@Noleenmegaair The Lipo is still in good shape, but i have only done about 3000 test welds on it. With a 600A car battery i get a bit better welding results compared to the lipo, because you can use shorter pulse times with the car battery.
with this can i control an microwave trasformer?!!!
The mosfets can only switch dc current. Microwave transformer needs ac current. But you could use just the Arduino Board and connect a relay to the 8-Pin Header output of the mosfet driver. So basically replace the mosfet board with a SSR relay that then switches the primary side of the microwave transformer.
Will a 6s lipo work?
D Bennish it needs an input voltage of 10-14V . 6s Lipo will kill it.
I tried to buy it two times, you never sent anything !!! disapointing.
Any US outlets selling this?
David Henderson I got mine in like 5 days after ordering and I live in New York.
Please file coding arduino please sir
All these video's I see people using 30ms or less to weld .2mm nickel strip. With a Brand new Car battery or the Recommended 3s 150C Lithium pack even at 50ms I do not get good penetration with even .15 nickel.
I am having the same problem. Received my welder about 4 weeks ago
Please coding arduino sir please...
It's not a welder, it's an acid battery killer. Using transformer to decrease voltage and increase current? No, just short-circuit a battery. Short-circuit current is not enough, should I use a transformer? No, just use two batteries!