DIY Spot Welding Machine

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How to build a Spot Welder with a microwave oven transformer. Never connect the transformer to the grid before removing the secondary coil, because it produces 2000 Volts at 500 mA, this is LETHAL. A secondary with more turns than primary rises the voltage. On the other hand, a secondary with less turns lowers the voltage and put more amperes to draw. With a thick cable we make a 2 turns coil that delivers 2 or 3 volts and many many amperes. This is why the cable has to be very thick.

[@kenw.1112]

This is a excellent video on making a spot welder . Thank You! I have repaired microwave ovens for over 30 years . A cautionary note for anyone who is going to take apart a microwave oven for parts . There are high voltages with LETHAL CURRENT present inside microwave ovens. No Exceptions be sure microwave oven is unplugged and for extra safety short the magnatron high v. capacitor out. It has a bleeder resistor but do it anyway. A guy down the street opened his broken microwave to attempt fixing it. He reached inside and was electrocuted died on the spot.

[@pikudopikao8425]

You know, in short time the capacitors just discharge by themselves but yes, it is very dangerous.

[@husse843]

U repair mickrowave for 30 years now ?????

[@stoneisland1000]

@@husse843 I'm laughing

[@tinkmarshino]

that is good advice but what does the magnetron high voltage capacitor look like and where is it? Also how do you discharge it?

[@FragBenitez]

I just read this after dismantling a broken microwave oven, fishing for the transformer. Guess I'm lucky, but yeah I got a little cautious when I saw a big capacitor inside, thought to myself "I should have discharged that". I work with CRT monitors so I know this can be lethal.

[@Benoit-Pierre]

I had read several welder tutos; I always found them a bit complicated for me; here, you show a very easy method, and I will build it very soon.

[@mirosawbuczynski4152]

To doskonały film na temat tworzenia spawacza. Dziękuję Ci! Od ponad 30 lat naprawiam kuchenki mikrofalowe. Uwaga ostrzegawcza dla każdego, kto ma zamiar rozebrać kuchenkę mikrofalową na części. Wewnątrz kuchenek mikrofalowych obecne są wysokie napięcia z LETHAL CURRENT. Nie ma wyjątków, upewnij się, że kuchenka mikrofalowa jest odłączona, a dla dodatkowego bezpieczeństwa krótki jest kondensator o dużej pojemności. Ma rezystor upustowy, ale tak czy inaczej. Facet na dole otworzył złamaną kuchenkę mikrofalową, żeby spróbować ją naprawić. Sięgnął do środka i został porażony prądem, zmarł na miejscu.

[@Roccoo]

this was a great video! lots of useful info here and i really enjoyed it! now i want to make one.

[@tinkerbit]

Removing the transformer shunts increases the available power but introduces a risk of core saturation and overloading the primary.

[@sergeismd]

Все гениальное просто , спасибо

[@Miata822]

Wonderful ingenuity! Thanks for sharing!

[@MysticalDork]

be very careful if you use the first method because you can easily damage the enamel insulation on the primary and cause a short circuit to the core. Paint the part of the primary that was in contact with the core with some nail polish or similar, and use a sheet of card or plastic to ensure that there are no shorts.

[@tinkerbit]

OK. Thank you!

[@p0k7lm]

grear advice on paint insulation , i once used plastic clear coat , but under abnormally high temps its not so good.🔧🔩👍

[@panikkosmakkoutos7173]

8

[@milankral5891]

Lak to nezachrání. Tenhle návod nikdy nedělejte! Životu nebezpečné! Najděte si jiné video, toto je zatím to nejhorší, co jsem kdy viděl. Autora by měli uvěznit.

[@fluchterschoen]

Tune in next week to find out how to build your own coffin & incerator...

[@arthureleclair29]

+fluchter1996 ,,,,,how bout' it,,,joker........LMAO......thanks.....

[@Appregator]

😂😂😂😂

[@jakenbaked87]

If you do two in series, you can make a stick welder. If you attach a RMS current regulator and high current diodes, you get even better results.

[@Nabo00o]

woa i didn't know microwave trafos had magnetic shunts! I guess there's a reason they are such a popular item, the shunts makes them practically short-circuit proof just like a welding trafo, perfect for happy experimenting!

[@eugbug1]

Microwave oven transformers are great for projects because unlike some other transformers, the core is in an 'E I" format. So the 'I' limb can be removed easily. I made my new high current switch mode power supply (20A DC) using a re-wound microwave oven transformer. After cutting the core I clamped the 'I' part back on using two steel plates rather than re-welding. They're great for use as powerful electromagnets also. The primary can be run on low voltage DC with the secondary removed. A suppression diode should be used on any switching circuitry to protect semiconductors or contacts of relays.

[@milankral5891]

Také jsem zkoušel zdroje postavit, zejména nabíječky a nikdy se to neosvědčilo jako když jsem si precizně navinul svoje spočítané trafo z originál plechů. Tohle má ohromné ztráty - i naprázdno je odběr okolo 3-4 A. Dá se to sice zregulovat elektronikou, ale ty ztráty jsou tam pořád. Jediné uspokojivé použití by bylo jako booster - pro krátkodobé použití k nastartování vozidla. Ale musíte použít pořádné 100-120 A diody + chladiče.

[@user-ug7ju1pd4z]

Good morning in Thailand, thanks for showing me know

[@tinkmarshino]

This was interesting.. but where were you twenty years ago when I could have used one of these... Thanks for the share... Merry Christmas!

[@tinkerbit]

20 years ago I was preparing for my future and beggining working. And after that I could afford to do things I like like this in my spare time. Merry Christmas for you and your family too!

[@antoniosantangelo8759]

Ciao di tutti i video che ho visto il tuo video è il migliore in assoluto per il fai da te perché sei di una semplicità strabiliante complimenti poi uno lo personalizzo come vuole Ma sei davvero brava a spiegare

[@sangalgojojijoe3463]

what do you eat every day??.very amazing..thanks a lot for sharing this knowledge...

[@josesimon4557]

El hilo está recubierto de una laca aislante con lo que no tiene por qué haber ningún problema. Supongo que ese papel blanco es para proteger más y para que encaje bien y no se mueva. Siempre hay que actuar con sentido común. Esto está pensado y dimensionado para un microondas y no para un soldador, con lo que deberemos estar bien atentos que no se caliente. No es para un uso continuado o industrial sino más bien entre casero y experimental.

[@p0k7lm]

great job 👍 , tnx 4 vid ! when i build mine i will try using carbon rods for electrodes .⚡gringing the core is the way to go instead of cutting apart the valuable useful copper secondary, as for the buzz core sound ( not anoying ) it indicates its powered up .⚡🔩🔧👍

[@radumotisan]

very nice! this could prove useful, and using wood seems a good approach

[@axelbelleris]

I like very much your idea! A prototype of soldering! I from Argentina. :)

[@dashuslab3316]

Thanks for the video guide, I've made one for 18650 battery welding

[@calcolson2813]

I made one from a microwave but I just can't weld battery packs worth a darn. One problem will weld one wouldn't. Dat one sided weld is not very good most time I almost burn a hole. And wen it seems like I'm making progress. I make a weld not a good one but a small start .I try to make another one. And nothing. I brush of the probes and I can make a one sided horrible weld. Den nothing. Brush of probes a one sided horrible weld. Wat can I do to improve.

[@MattsAwesomeStuff]

Aha, I spot my grind & clamshell MOT method. I'm pretty sure you learned how to do this from my videos, or ones like it :). Good job!

[@FeCr3]

Excellent! Harmless 2 or 3 volts of voltage output. But massive amps...

[@tinkerbit]

Thank you!

[@benuitraalte]

This is the best preform video ever I saw on KZbin ! Just found exactly what I wanted to see! GREAT JOB!!! good discription no bullshit no intro no nonsens AWESOME !!

[@tinkerbit]

Secondary, the wire is much thinner. You can cut it with an utility knife. Do several cuts and draw the cut wires with pliers. Cut again and draw, and so on.

[@tinkerbit]

A copper alloy used for electro erosion electrodes. Is has cobalt and other metals also. Very conductive and harder and higher melting point than copper

[@larrybaker1205]

looks cool I will have to give this a try

[@tinkerbit]

The main reason is that I am Spanish and my English pronunciation is far from perfect. Other reason is operative: in order to make a good sound a voice over is needed. Even in my own language is not easy to speek. When we see TV newsreaders we usually think that it is easy, but when you try the results are too much different. If you want you can see and hear me in Spanish in this youtube channel: cienciabit I am trying to improve my diction, intonation, diction, etc, .... but it is not easy.

[@alextrombogosy293]

I understood , im Brazilian and i have the same problem

[@amankumar-kr6rr]

this is fantastic this program.

[@GRAHAMAUS]

Have you done any tests to see how thick the metal can be and still make a good weld? I have an old microwave transformer - might give it a go myself. A nice touch would be a microswitch that turns on the primary when the jaws are closed (safely insulated of course).

[@neehaglee7249]

Totally Amazing! Damn Good! Thanks for sharing this most wonderful video. :-) Lots of effort!! Kudos to your patience :)

[@tinkerbit]

Thank you!

[@tinkerbit]

The shorter the best. If you see pro spot welding machines photos, they have the electrodes very near to the trafo. My example has too much cable. If I had to use it a lot, perhaps I would shorten it.

[@SVAROG-FREE-ENERGY-COM]

Very very good job my friend 👍

[@pedroventuracalos2513]

muy buenos videos amigo, una pregunta que numero de cable es el que usa porfavor,,, saludos

[@Jimbo78ify]

This has been done before taken from a user on Instructables... This is a simple hack but leaves no safety regulations or fire-control hazards. Adding some sort of temperature detector would be a good safeguard as well as a capacative field indicator in case someone's finger came too close to the contact. Very simple to do and only need a High Power Mosfet to switch of the Primary... One last thing would is to shield it, ( Magnetic Field, any metal on you is a path to ground).

[@zvarkovethebest5019]

Thanks so much for the genious idea

[@tinkerbit]

No, I haven`t. Since the distance between the tips is very short and the iron plates to weld are thin the resistance is low so I think you dont need more voltage. You needs Amps.

[@MrPhillerup]

Great spot welder!

[@marceloclaudiocampos1277]

muy bueno gracias por su enseñanza amigo

[@linjari]

I guess you could do secondary winding from copper brake line with shrink tubing and put coolant flow through it.

[@rabelad]

Very clever! Thank you!

[@UberAlphaSirus]

No, the primary, the mains side, has to be rated at your outlet voltage. the secondary, the output side you can do what ever you want with it, it will not effect the primary as it is set to give a set amount of power thru the core. However the secondary is your own design, so you could over do things on that side.

[@Nexfero]

very informative keep up the good work

[@tinkerbit]

Thanks!

[@giampieromurgia6962]

Bravissimo ... che idea geniale! 5 Stelle !!!!

[@tinkerbit]

+giampiero murgia Grazie!

[@tinkerbit]

Because the big amperage is only at the secondary circuit, this is in the thick cable. The primary is at 230 V and perhaps 10 A, so the circuit breaker doesnt flip. The secondary is "isolated" from the primary, this is called galvanic isolation. The circuit breaker "feels" what happens with the primary, but knows nothing about what happens to the secondary.

[@hyparh]

The shunts are there for some current limitation so I don't think they need to be kept, especially in this case, when we need as high current as possible.

[@electronicshelpcare]

Thank you for the great video.

[@thexenon8717]

y66yy6y6y6yyyy66y666

[@sebatianangelomatos6930]

Siga kzbin.info/www/bejne/oGOki2qqfZtnf7c

[@maxwang2537]

Thank you. I’m going to make one of these.

[@tinkerbit]

Look up "American wire gauge" on Wikipedia. There is a table. For #4 gauge wire it fuses at 94 6A for 10 seconds. I connect it less than 5 seconds. And yes, it ends hot.

[@oodimvale]

good....good...Thanks.....São Paulo - capital - Brasil

[@kwstikas82]

hey, nice job there. have you tested the maximum thickness of metal plates this welder can weld?

[@carlosluzandre475]

MUITO BOM OS EXEMPLOS E OS CUIDADOS, BASTANTE ESCLARECEDOR DAS UTILIDADES DO TRAFO DE MICRONDAS

[@mauriciomedeiros349]

Bacana gostei e entendi bem a funcionalidade , muito bom !

[@martadepina9349]

Interessante

[@martadepina9349]

Tem que ter muita paciência , nossa , que trabalhão.

[@SarjanaTutorial]

mantap mas tutornya,, moga bermanfaat, semangat

[@iknowsstuff]

dude this video has near 500 000 views and 61 dislikes its a success so don't be shy speak up ps i subbd

[@tinkerbit]

Thanks, I am from Spain. I am improving my English, but never find the moment to begin speaking.

[@iinvokemyfirstamendmentrig7937]

mopatin Just speak. People will either like or dislike what you say. Don't worry with what others think, do what you think is good.

[@chokkalingamt2366]

millston

[@RyuunosukePanda]

The best you can do is look up "How does a power transformer work" Hope this helps.

[@ErezAcker]

Thank you. Do you think a copper pipe will make (after corect shaping) a decent electrode? Or is brass better still? Thanks again.

[@tinkerbit]

All transformers are AC, not DC. If you want to get DC current you need to rectify the AC with four diods, in this case high current diods.

[@tinkerbit]

Perhaos around 100 if you multiply the horizontal number of turns by the vertical...

[@seepoowoop]

Awesome I did a 12v one for input and it gave me 45,000 volts!!!!!!!

[@gqmachine4366]

nice !! thank for good video and know how it made .

[@tinkerbit]

No. Only the plates that are inside. Mine is only for experimentation not for serious uses.

[@CheckEmGG]

NIIIICE!! what gauge wire did you use for the secondary?

[@JahanZeb1976]

You didn't care of the primary insulation while putting winding on core. This is dealing with 220V supply, caution is a must to insulate it properly otherwise it could kill!

[@JahanZeb1976]

+Mark Schulz IV Yes this is normally the case. A good winding job consists nice insulation. Insulation is same or of importance as of conductance is!

[@oldguy5107]

+LearningZone The wire is insulated. Just looks bare. Transformers are made with clear insulation to save space, and for efficient operation,

[@JahanZeb1976]

+old guy Yes I know winding wires are enameled insulated but we are never every putting them without paper lining in metal core. Otherwise there is a chance of core to wires contact which leads to short circuit. I will upload a video soon on my channel covering this subject. Regards,

[@oldguy5107]

+LearningZone I agree. I never mentioned or refered to the paper to in the core. Sorry for the mis-understanding.

[@DeltaDestiny]

+LearningZone i agree, its good practice.

[@beauhart5592]

When you remove the primary coil be careful not to damage it if even one winding is broken it will not work it if u do damage it don't bother with repairing it instead just take it apart the primary coil uses magnet wire which I turned into a metal detector coil

[@tinkerbit]

Well, I am not an expert, and more a tinkerer. With the plates out the trafo gives more current, and more heat. So if you quit them take more care. I have read on some place that it is possible that the trafo gets hot with the secondary open so only connect it when you "spark it". And dont touch the trafo when it is connected to the mains.

[@frankfontaine4615]

nothing more magical then wires in a circle producing electricity in a other circle of wire

[@user-oh4bj5ee5x]

عالی ، خیلی خوب و آموزنده.ممنون

[@dazaro3]

Good video.Thanks

[@gisellasaavedra519]

MUY BONITO EL SOLDADOR SALUDOS DE PERU

[@qaisarawan93]

nice video I tried to follow along with it and bought a used MOT, the seller connected ac voltage to the primary winding (thin wire side). And it created humming sound. At home I removed that side and when I connected ac to the secondary side it created smoke and smell and became very hot to touch. Seems like the Secondary was already short? What you say? Also Now can i rewind it using suitable size enameled wire? Will winding it with slightly thinner wire be ok for spot welding?

[@paparoysworkshop]

Time to sacrifice my microwave. ;-)

[@tinkerbit]

Be patient. Once you are focused on that, you will see an old one near garbage or dumpsters. Or perhaps some friends or relatives that have bought a new one and give you the old one.

[@paparoysworkshop]

mopatin lol That was just a joke. There are many old microwaves kicking around and I already got my hands on one and built my own spot welder. It was fun. You have a great day.

[@prabinbasnet6531]

ɷɷɷ I Haveeee Watchedd Thissss Moviee Leakedd Versionnnn Hereee : - t.co/NdLgwVlw7a

[@patonova89]

What open circuit voltage recommend, in the secundary?

[@ErezAcker]

hi great vid. what did you use for the electrodes? thanks.

[@jimu57]

Thanks. I found it. Have you tried smaller wire such as #6 or #8 and using more windings? Or do you think that is not going to produce enough amperage? thanks.

[@ailtonsouza3110]

Very nice mister

[@printlok]

you sir are awesom !

[@jiexiang123]

Since it's 2 to 3 volts, you can touch both electrodes even though the amps are high as the volts are too low to electrocute you. Don't touch hv cables though.

[@cscentoamore1]

Very good, what is the measure of this cable you used in secondary?

[@kuromatsu01]

great job but i would probably too scared to try it XD

[@adnantahir2070]

Llplllol

[@godparticle3833]

I have one you can touch the output it so low voltage its finr

[@danyk666]

You just made the transformer very DANGEROUS because you forgot to put one of the primary insulation papers back. Now you easily get mains voltage in the core and possibly in the output, because the low melting point of the secondary's rubber insulation.

[@franktechniek]

***** Exactly what I thought. I also don't understand why removing the primary and immediately reinstalling it again. Just leave it in place...

[@nebnoswel]

***** The primary windings are all enamel coated

[@danyk666]

The enamel is not enough for safety. Enamel insulates one turn from another, but the core must always be insulated from wire by something like transformer paper or other safety insulation.

[@franktechniek]

nebnoswel The enamel coating is very thin and fragile. When he slides the primary coil back into the core, one side has the paper removed. There is a good chance of scratching of some enamel and causing some short between the primary and core. Sure there is also a good chance of getting away with it, but I'd rather put some insulation in place and making sure it is safe.

[@Appregator]

Not if you use silicone rubber covered wire which is what it appears to be. Nevertheless I would still slide in a high temp strip of lagging or electrical cardboard just for extra safety.

[@S3EW3ED]

another way to share is that the power is being "transformed" but not GAINed. A transformer trans-forms power. Due to the current gain, the voltage will lower (but still weld decent eh)

[@aliazazy1857]

Thank you for your help.

[@tinkerbit]

Thank you too!

[@tinkerbit]

I would get less current and that means less temperature at the welding spot.

[@two_number_nines]

what would happed if i add turns to the first winding so it reaches half of the max possible windings volume, then remove the iron between primary and secondary and then fill the remaining space with 6-7 mm cable?

[@elciocabral8753]

Genius! great!

[@industrialtechnology4739]

Great Video

[@tinkerbit]

Thank you very much!!!

[@adammanick3507]

Putting the shunts back actually limits the current output. For a spot welder, it would probably be best to leave those out.

[@------country-boy-------]

*SHUT UP AND TAKE MY MONEY - GLORIOUS VIDEO MATE*

[@JR-kj6kn]

You should do a stress test on the welded can

[@hassanburrows8535]

Hola hermano. Muy bueno video. ¿Es un tamaño de dieciséis milimetros cuadrado de cobre suficiente para la bobina secundaria del transformador? Soy de inglaterra, así por favor disculpame si mi lengua española no es buena. Me gusta mucho la lengua, y estoy tratando de aprender. Muchas gracias, y un saludo cordial desde el chico electricista.

[@UberAlphaSirus]

yes, but you need the 2 outputs close together say 3-4mm, don't pass the current thru the battery only on the tab and the metal at the end of the batt. Batterys explode 'kin fast.

[@FunGKEE]

約50年前已有，小金屬踫銲連接用，缺點是連接點有燒蕉顏色，多用作下價產品制作，改良冇色板亦出了40多年了。

[@user-uc9oh6tf9w]

スケールが違う。凄い！

[@mdshakilkhan6825]

thanks for this

[@jiexiang123]

What I mentioned is for the spot welder he made. Im not sure about commercial ones but do becareful

[@Nature08405]

Thank"s, good job

[@demeteristvan6738]

l'Explorateur Proj ?l

[@daruoshmonjezi9175]

thank you for this information.....

[@tinkerbit]

Ok. Thank you too.