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An Arduino Nano based Spot Welder for battery welding


This Spot Welder can be used to weld 18650 batteries. It needs a 7-12V power source (12V recommended) and uses a 12V car battery as welding current supply. Typically one 45Ah battery delivers enough current to get good welds with 0.15mm 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 1/8 of the time of the second one. Pulse time of second pulse is adjustable by the potentiometer and displayed on the screen in mS so you can exactly adjust the time. Its adjustable from 1 ... 20 mS.

Watch the Video to get detailed instructions on how to build it.

https://www.youtube.com/watch?v=3RLVuy5PUKo

Project Files:

https://github.com/KaeptnBalu/Arduino_Spot_Welder

Due to many requests for the PCBs

If you guys want to buy a set of pcbs to build your own spot welder please take a look in the comments below this instructable. Some people who ordered boards at PCB manufactures are willing to sell some of them. I don't have any more pcbs left for sale.

Step 1: Making the PCB

You can find the Eagle files for the PCBs on my Github.

Easyest way is to order the boards at an PCB manufacturer. For example at pcbway.com .There you get 10 boards for about 20 €. The necessary gerber files for ordering at pcbway.com can be found in my Github.

You can support me by registering through this link http://www.pcbway.com/setinvite.aspx?inviteid=128...


This way you get a 5$ coupon for your order and i get some credits at the shop which i can use for upcoming projects.

But if you like diy you can also build it on a prototype pcb board with hand wiring. This is how i did the first prototype of the spot welder. In the pictures you see a manufactured board looks much cleaner.

Hi Guys,<br><br>My order finally arrived from Seeed after reordering and choosing a courier rather than hong kong air.<br>I'm willing to post my spare boards to anyone in Australia for $5 each + $10 packaging and postage. Sending overseas isn't worth it, so please don't ask :)<br><br>PM me if you are interested.<br><br>Mick
Hi mate I'm interested in maybe 4 boards I'm in Melb. Also do u sell components or can recommend where I can Aquire the components
<p>Check your messages. You may need to show the full site view if you are using mobile.</p><p>Mick</p>
<p>Hi</p><p>someone knows if i can change the drivers mosfet MCP14E10 E/P for this one MCP14E11 E/P or it other MCP14E07 E/P, is it work as well?</p><p>thankyou</p>
<p>Does anyone in the US have any spare PCBs?</p>
<p>Hi <a href="http://www.instructables.com/member/KaeptnBalu/" rel="nofollow">KaeptnBalu</a>,</p><p>First I want to thank you about this very interesting project you shared. I will spare a significant amount of money for one of my personnal project (diy ebike battery).</p><p>So, I wanted to order 10 PCBs from <a href="http://www.pcbway.com," rel="nofollow"> http://www.pcbway.com, </a> uploading your gerber zip file as it was in your github.</p><p>But the audit failed with reason invoked as &quot;could not make vcut according to dotted line&quot;. I guess its the line in the board center which is used to break and split the pcb to get the 2 board.</p><p>I filled the pcbway quote form as you described (beside I asked for a blue board, all was identical).</p><p>My question is : is it a known issue ? Did I make a mistake ? And do you plan to update your eagle/gerber files in github to prevent this issue ?</p><p> Thanks for you answer.</p>
<p>Hi CodeExtreme,</p><p>I'm interested in a PCB - you have still one left to sell?</p><p>Dude</p>
<p>where are you dude ? :)</p>
Germany, near Stuttgart. If you send me 2 pcb's I can pay you in advance via Paypal e.g.<br>Dude
hi codextreme, if you not used the all pcbs, pls sell to me, thanks before
In Netherland, email : alengso@gmail.com
<p>where do you live <a href="http://www.instructables.com/member/alengso" rel="nofollow">alengso</a> ?</p>
<p>Ok got a mail from pcbway, its the same problem about 75mm min distance from border as evoked by <a href="http://www.instructables.com/member/lox897" rel="nofollow">lox897</a></p><p>I will handle that with them. But could you consider this issue and warn about it in your procedure, or update your gerber for others who would like to order PCB from pcbway ?</p><p>Thanks.</p>
<p>Ok, for the story, I solved the V Cut problem with PCBWAY <strong>but I had to pay $25</strong> instead of $12, (plus $12 for transport). They first refused the PCB as it because of the border distance. Saying me that they couldn't make it as it but accepted just not cutting the V Cut. However, this morning the gerber file was accepted but price changed with an annotation explaining that it needed &quot;use of special technology&quot;.</p><p>I guess I was charged $15 for the gerber modification service. Think I could have done by myself but finally accepted because I was lazy and didn't wanted to lose more time in another round of validation for a new file.</p><p>So, I'm coming back here for an update of my situation, and a demand to <a href="http://www.instructables.com/member/KaeptnBalu/" rel="nofollow">KaeptnBalu</a>. Please, could you update your gerber and remove the VCut ?</p><p>Or another option would be to give 2 version of the file : one with and the other without VCut. It would be convenient if we have a file which would be automatically accepted by PCBWAY ? And so keeping the original price tag ?</p><p>Thanks again for this project.</p><p>Regards.</p>
<p>I added the gerber files for the single Boards to my github. So people can order each board individually. This will also cost a little bit more but should work without problems.</p><p>Don't know why they try to make a v-cut or panelization with the board. There is only one outline arround the whole board in the dimension layer. No v-cut line or something like this. Maybe someone who has more experience with making pcbs can figure out what to change in the gerber to solve this problem with pcbway. </p>
<p>Here's what was said by pcbway :</p><blockquote>Thanks for the quotation on our website. For order XXXXXXXXXX, checked<br>the file, between the two boards you designed dotted lines, but we could not<br>make v cut along it, you only cut by yourself, here attached the picture,<br>please kindly check and confirm.</blockquote><p>I havent used eagle for a while, but I guess the dotted line in your schematics is actually positionned (and/or automatically added) in the vcut layer. If you want to just draw the line, it should only be in silkscreen layer (so it will be drawn, not cut).</p><p>But im not very experimented with Eagle so I could be totally wrong ! :)</p><p>If you wish, I could check this at home later. </p><p>Regards.</p>
<p>The dotted line actualy is on the silkscreen layer (</p><p>punktschwei&szlig;_pulser_panels_v2.topsilkscreen). Thats why i dont understand the problem pcbway has. You can view the gerber files online at http://www.gerber-viewer.com/default.aspx . No need for eagle there.</p>
<p>Here's what was said by pcbway :</p><blockquote>Thanks for the quotation on our website. For order XXXXXXXXXX, checked<br>the file, between the two boards you designed dotted lines, but we could not<br>make v cut along it, you only cut by yourself, here attached the picture,<br>please kindly check and confirm.</blockquote><p>I havent used eagle for a while, but I guess the dotted line in your schematics is actually positionned (and/or automatically added) in the vcut layer. If you want to just draw the line, it should only be in silkscreen layer (so it will be drawn, not cut).</p><p>But im not very experimented with Eagle so I could be totally wrong ! :)</p><p>If you wish, I could check this at home later. </p><p>Regards.</p>
<p>I just received PCBs and have 6 spares.</p><p><strong>Only delivered by hand in Paris,</strong> France. For 5&euro; a piece or a good pint :)</p><p>If interested, please PM me on twitter <a href="https://twitter.com/codextreme" rel="nofollow"> https://twitter.com/codextreme</a></p>
<p>Just got my pair of boards from Joomyll - awesome! <br><br>I like the trigger idea, but seems like it would be a problem holding both electrodes evenly and firmly down that way. Maybe I'll keep the electrodes separate, but put the trigger attached to one side. The trigger/switch is just a momentary, right? </p>
<p>Yes I have made and tried it last night and it works but I really don't like it as much as the foot trigger, I guess that everyone is different. I will post a photo of it on my web site tonight. check out my web site: </p><blockquote>http://ralphshobbyshop.com/?page_id=609</blockquote>
<p>I have attached a couple of photo's of the probe that I built, hope it gives you some ideas. Looking forward to your ideas also.</p>
<p>Great, i love that probe, and trigger on separate probe is good idea to! ;-) </p>
<p>Hi Guys</p><p>would anyone have a extra set board PCBs to sell and send me, please?</p><p>best regards German, from Spain</p>
<p>I made it and it work excellent, my pulse adjustment is 15 , here is youtube link: </p><p><iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/ta7ZnQr_anQ" width="500"></iframe></p>
<p>I like the trigger idea, looks much better then the foot paddle.</p>
<p>just wondering if anybody was able to turn this into some sort of a kit to make thing alot easier? id love to get one if possible</p>
<p>Jeg har noen kort, sender i Norge kr. 100.- for kort display og frakt :-)</p>
ill take it if still for sale
<p>Hi,</p><p>Would you have one or two spare PCBs that would would be willing to sell ?</p><p>Cheers,</p><p>Akira (from Paris)</p>
<p>Akira,</p><p>I have a couple extra boards.</p>
<p>Hello. So I finished building the Arduino Spot welder and I encounter the magic smoke problem after the press of the foot switch. The third time destroyed the Arduino Nano. The one thing I noticed after the first press of the foot switch the underside of the board with the arduino nano felt warm. I assume there was a short created.</p><p>I want to confirm the parts I used are correct. Since I live in the United States, I used Mouser and digikey.</p><p>Mosfets: <a href="http://www.mouser.com/Search/ProductDetail.aspx?R=AUIRF1405virtualkey57370000virtualkey942-AUIRF1405" rel="nofollow">http://www.mouser.com/Search/ProductDetail.aspx?R=...</a></p><p>Gate drivers: <a href="http://www.mouser.com/Search/ProductDetail.aspx?R=MCP14E10-E%2fPvirtualkey57940000virtualkey579-MCP14E10-E%2fP" rel="nofollow">http://www.mouser.com/Search/ProductDetail.aspx?R=...</a></p>
<p>I live in Canada and I also used the same parts from Mouser on the first board the second board I built I used IRFX44 Mosfets. I used Mouser, DigitKey, and Newark for most of my parts. Please note that I encountered a bad MOSFET board that caused me a lot of trouble, </p>
I probably encountered one bad mosfet. I checked each mosfet if they work by checking the continuity through the drain side and testing each pin. Either the gate or the source was open. I'm contemplating whether I should just get a dedicated battery spot welder or spend an amount that will be the equivalent of the battery spot welder after this predicament.
<p>do you have any spair or extra boards, as I had 1 that was no good, if not go to ve3vxy and send me an private message</p>
<p>I have two left over from OSH Park. I used their 1oz copper process. I'm still deciding if I should make another one... </p>
<p>I ordered boards from SeeedStudio and sent them the Gerber files. They inquired whether to make two separate boards or not. I said no, and they sent ten sets for $14. Great quality. Longer delivery time than expected, but still acceptable.</p>
<p>Second time around works great for more information visit: </p><p>http://ralphshobbyshop.com/?page_id=609</p>
<p>I wonder if anyone has any boards available. I pm'd joomyl but got no response, so I assune he is out.</p>
<p>I have a couple extra boards.</p>
hi RogerN16, do you have stil extra pcbs ?
<p>Can u sell me 1, i live in germany?</p><p>/j&ouml;rg</p>
Can u sell me 2 i live in Australia
<p>hello, is there someone with one copuple of boards to sell ?</p><p>regards</p>
<p>hello, is there someone with one copuple of boards to sell ?</p><p>regards</p>
<p>I sent you a PM.</p>
<p>I still have few boards free from an order arriving. Send me an private message if you want one.</p>
Hey im interested in a couple of boards do still have some? <br>I live in Canada
<p>Got my boards today, looking sweet!</p>
I need 2 board if u have can you sell it to me thank i live in Australia

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