Microwave Oven Arc Welder(DC Output)

[@electronicsNmore]

See it in action here: kzbin.info/www/bejne/mXXYnWqPo896gtU Detailed build info here: kzbin.info/www/bejne/mpawnomBa5x7hZY **For GREAT deals(Usually cheaper than EBAY) on other electronics, drones, automotive tools, household items, phone accessories, locksmith tools, & much more, please visit the link below and SAVE IT AS A BOOKMARK on your computer or smartphone to Banggood for future purchases. (Your purchase supports my channel!) Home Page: bit.ly/2wDbRdi Flash Deals: bit.ly/2eBLkVI **Try these money saving coupon codes: affiliate6 or measure or BgAuMotor or HDWARE2 or WELDTOOL** or ask if other codes are available!

[@electronicsNmore]

Once you get that far, you can add a 100A diode trio/rectifier from a car alternator to the AC output. Next you take a very high value DC electrolytic capacitor(Like I used) and place it across the DC output. ++ to --. Make sure the capacitor is rated HIGHER than the voltage you are using. Double is ideal. Mine are rated 82V. Make sure to cool the diode trio rectifier. A varistor/mov can be added across the cap to help protect the diodes. Use an MOV that is rated just over the diode rating. .

[@electronicsNmore]

Yes it works. Why would I make it, if it did not work? I put this together a while back. I did not have a schematic. I made it from my head. LOL Take two microwave oven transformers of the same size/wattage and chop out the secondary(fine wire 2KV secondary winding). On each transformer you wind 20T of 10ga stranded wire in the same direction. Connect the two transformers primary windings in parallel to 120v, and the newly wound secondaries in series. Connect clamps. This is the AC version.

[@ICanHasSmash]

That is the coolest home made welder i have yet seen!

[@electronicsNmore]

We all know it refers to micro farads, the average person who watches this video knows very little if anything about electronics. When they read a capacitor if they look to make this unit, they will see the ENGLISH letters "uF" on the capacitor. That is why I state uF, otherwise they will not know what I am talking about. If you have a problem with my channel, I suggest you hit the road. People who have nothing nice to say, can get lost.

[@donaldellis9004]

just wanted to add a great idea I have discovered 400 watt metel halide transformers work great, I removed the shunts and wound it just like a mot and it works great.

[@electronicsNmore]

Not too thin, #10. That has been proven over and over with my regular use of the welder. The wires never got hot, or very warm. That gauge wire for my intended use can handle up to 40 amps with no problem. I also only use 1/16" - 3/32" welding rods, which keep the current down.

[@peterjohnson5586]

Your welder probably can only put out about 30A, 120*15=1800, 1800/54=33, so considering that you have losses in the transformer and the circuit, you are probably only running 30A@55V, that is why your 10 AWG is ok.

[@electronicsNmore]

Aquí no hay una mierda. Funciona a la perfección. Si no tienes cosas buenas que decir, luego ir a visitar otros canales de youtube.

[@electronicsNmore]

Actually the 10 gauge wire can handle 40A with no problem. You have to realize that I intentionally use 1/16" welding rods to make sure the current stays down. Using thicker rods would allow more current and overheat the wires. Everything works fine as designed. This unit is not designed for continuous duty. There is a duty cycle to avoid excessive heat from the transformers. Thanks for the reply.

[@billysgeo]

VERY nice built! Very tidy! Note: Dont say "you-ef" for "uF". Its micro-farads. The "u" is a substitute for the Greek letter "μ" (m).

[@electronicsNmore]

Thanks. I use it from time to time. Works very well.

[@electronicsNmore]

@luizrosarosa No clue what the rating is....Probably 30-40 Amp output. but I keep the rods at 1/16" thick to hold back the current so I do not overheat the transformers. 10 ga copper is rated for 30 Amps, but you can push 35-40A if you needed. If you use a thicker rod it will take more current to get it to melt. I used a 105A rectifier for a car alternator. The capacitor smooths out the rectified DC current/absorbs spikes and helps make the weld better. You can used a 15-20A rated Dimmer.

[@electronicsNmore]

NO. Full wave.The alternator uses 6 diodes to convert the 3 phase AC produced by the alternator to DC. I only needed 4 of the 6 diodes to convert the single phase AC to DC.

[@electronicsNmore]

I used the 3rd small transformer to power the cooling fan. I could have had the fan turn on once a certain temp was reached, but I got lazy. The fan runs as long as the unit is turned on.

[@SamaritanElad]

They sell 120vac fans....

[@elecrticityelectronics8591]

Nice job. You could have powered the DC fan from one of the microwave oven transformers by just adding a diode bridge and a capacitor. Very compact, very nice work.

[@electronicsNmore]

True, but I prefer that only be used for the welding. The output isn't stable enough, especially if the welding rod gets stuck to the metal. Thanks for watching!

[@electronicsNmore]

To filter & make very smooth the rectified current. You want a smooth DC output.

[@electronicsNmore]

120VAC ground wire is to case. DC output is isolated from the case. Electrode NEG.

[@electronicsNmore]

@Stormas3000 2.6 mm wire. Ok, 230v. Same procedure, but you will use 1/2 the turns of 6.2mm copper wire when you wind it.

[@electronicsNmore]

@Stormas3000 Stranded 10ga copper wire. Make sure the electrode is 1/16". Cheapest place to buy a roll of 10ga stranded is at Autozone.

[@brodie1709]

you should add an extra alternator with the internal voltage regulator removed to your generator or another simular setup so you could also have a portable stick welder, but you would probally have to add a throttle somewheres to increase or decrease the voltage.

[@ernestberry5226]

Excellent stuff! I love all your vids. Great presentation, no bull and very informative. you are very capable in different disciplines. thank you very much for taking the time to upload and make these vids. You have certainly had positive influence in my education of these things. please keep it up.

[@electronicsNmore]

+ernest berry Great to hear. I need many more viewers just like you. Be sure to rate thumbs up and share my channel with others. Thank You!

[@ernestberry5226]

+electronicsNmore pf coarse i will.Thanks again.

[@electronicsNmore]

Yes, They are rated 100 Amps from a GM alternator.

[@electronicsNmore]

No. The capacitors are used to smooth the converted AC input to DC. The larger the value, the better the smoothing will be.

[@SamaritanElad]

Better said " Caps used to smooth out the pulsing DC voltage." Like getting plain potato chips instead of ripple potato chips :-) Problem is that your working those caps Very Hard & stressing them. An inductor (with caps even) would be better for long term use.

[@Lorand24]

If you connect capacitors paralel you will have 40v and 2x the capacity you specify, if you connect in series than you will have 80v but the capacity drops 1/Cp= 1/C1+1/C2 as i know

[@windoes98se]

that setup looks better than the welders you can buy at harbor freight

[@Okicombo]

That is a nice build

[@normellow]

Loose the caps you don't need them , and get yourself a beefy inductor in series with the MOTS

[@mapleleaf4ever]

Well made piece of kit! Nice work!

[@electronicsNmore]

+mapleleaf4ever Thank You. Be sure to check out my other video showing it in operation.

[@JULIOCEBALLOSVENTANAVIRTUAL]

I very much like the apparatus for soldering, but I ask you a favor, and if you can give the schematic diagram of this. Thanks in advance.

[@teslatoyz]

Now all you need is a variac to adjust the input voltage to the MOT's, take the current down low enough to weld on autobody stuff.

[@NOBOX7]

drive down a few alleys in my town and you find expensive electronic components everyhwere

[@luizrosarosa]

Hello friend I live in Brazil and I really liked your welding machine, I also installed a microwave transformer and would like to know what your total rating, its bridge and full-wave diode? and what the purpose of the capacitors in this system? how you regulate the amperage, I'll try to put a dimmer in the primary for such embracing.

[@madaboutpix]

nice build!

[@Aaron48219]

Awesome job. Been trying to find info on a dc microwave welder. Sounded good in my head, just hadnt found info on anyone doing it. Question, whats the third, smaller transformer and rectifier for? An easy start circuit? Ps. Found out some panasonic microwaves have an inverter in them running around 4kv dc. I'd like to get my hands on one or two of these and try converting them for dc welder duty.

[@johnsonsworld7296]

Beautiful man!

[@electronicsNmore]

Glad you enjoyed the video! Be sure to check out my extensive video playlists for other great videos of interest to you, rate thumbs up, and share my channel. Thank You

[@TheNandopro]

ok awsome thank you for the quick reply I was expecting it to take forever I appresheate it.

[@vambreace]

WOW! look very well made. GOOD JOB DUDE!. must work very well. have you tested with 3/32" electrodes?.

[@electronicsNmore]

When I recorded the actual welding, the video was too bright to see anything. That is why I showed the actual plate that I welded. I would not waste my time with a fake video. All real, and it works perfectly. When I get a chance I will try a piece of welding glass over my video camera.

[@electronicsNmore]

That is correct.

[@electronicsNmore]

Go back to the video. Around 3:20 on, I describe the (2) 40V capacitors each rated at 37000uF. I then stated they are in series for 80V at 16500uF.

[@electronicsNmore]

I agree with the inductor, but disagree with the caps. The caps smooth out the AC ripple from the transformers. Many DC welders use them.

[@electronicsNmore]

@brodie1709 Good idea, but happy with what I have.

[@billadams2710]

Superb! Could I get a schematic? I'd like to make one.

[@harukoyama9515]

I was wondering what difference is there if I just take old electric cooktop. Connect 2 end with a wire to burn some red hot wire Is microwave mod any different then electric cook top ? Both is capable to deliver high amp?? Or not?

[@Stormas3000]

@myvideoisonutube thanks for the fast answer . I'm from Portugal 10ga are like 5mm^2 ?We use 230volts here on the houses

[@nayferio9615]

nice job bro..i like it..

[@Stormas3000]

Hi there, on the secondary windings did u use multi strand or solid wire?

[@TheNandopro]

We're would I get capacitors like the? any chance you can send post a link

[@electronicsNmore]

@thewii552 Everything except for the electrode holder/ground clamp.

[@electronicsNmore]

First off, I tried to film it, but the arc was way too bright for the camera. It came out faded/blurred. Secondly, I showed you what can be done on that 1/4" plate steel. I don't make fake videos. Thirdly, instead of a thumbs down, you know where you can shove it. Have a nice day.

[@harukoyama9515]

Like it. Would I be able to make one of this with my computer back up power supply? 12 volt DC?

[@electronicsNmore]

Not enough current output.

[@harukoyama9515]

My computer power supply is 620 Watt. Is it enough? How many watt can yours output? Did you put it together with varies component you found. Your compactor is huge

[@kaybee808808]

You scared me when you started to clear your throat. Nice video

[@electronicsNmore]

OK. I made a demo video to satisfy people. I welded (2) 1/8" plates together. The unit works great up to 1/4" MAX. The best performance is 1/8" to 3/16". watch?v=cDul7YnjGLs

[@intel386DX]

fantastic build :) from what equipment originally was the metal casing ?

[@electronicsNmore]

Nortel rectifier. Thanks for watching!

[@intel386DX]

@@electronicsNmore well done :)

[@anubismixmix2649]

Could you please post the circuit diagram. Por favor podrias publicar el diagrama del circuito.

[@geojor]

thank you for sharing...

[@dumass00072]

So you're only half wave rectifying you ac input?

[@thewii552]

you got almost all of that thing from the dump.

[@electronicsNmore]

Just uploaded a new highly detailed welder video. It includes the schematic!

[@aqprider]

great!

[@ianmangham4570]

Washing machine is 3 core 6mm cable

[@Centar1964]

Good job but the varistor really isn't doing and good connected to the output like that in this application.Your wire size gong to the ground clamp and stinger is way too small, get some booster cables for some cheap heavy wire...and I would drill some holes in the insulation plate of the rectifier to let air through to aid in cooling. Others have found that a choke (rewound MOT) works better than a capacitor (both is even better) for stabilizing the arc.

[@electronicsNmore]

+Craig Diamond Hi Craig. The wire size is just fine. I have had zero heating problems. I also have used this unit many times over the past couple years. It makes no sense to use a heavier wire leading to the clamp or electrode than the wire size used to wind the transformer(10ga). It works great as long as the electrodes used are 1/16". The varistor was used to help protect the diodes, nothing more. I use varistors in many of my 12V circuits which are connected to charging systems(alternators). Thanks For Watching

[@SamaritanElad]

He is using 52v so he can get away with smaller cables. But, 52v is rather too high as you can get a nasty shock from that. Hope person is not sweating on the job (zap)

[@electronicsNmore]

I uploaded a highly detailed video, which includes a schematic. The link is located in this video.

[@Jacobpew]

I've got all the parts i need to make a M.O.T. DC Welder except for the caps and the ones you have are rather expensive on the site that I found them on. So i am wondering why you didn't use a capacitor out of the microwave? You may not have used them because they are way too big, but i also have some capacitors out of an old A.C. unit that are rated for 440v and 360v (i think). I'm thinking i might use one of those if they are in good shape still.

[@electronicsNmore]

Those caps are "non polar", designed for use with alternating current.

[@Jacobpew]

@@electronicsNmore how is the alternator bridge rectifier working out? I pulled one out of an old alt. but over the past couple of days researching how i want to build it, I came across some info that said the voltage capacity on the rectifiers from alternators wasn't rated for the amount used during welding. I found a 300a 1600v bridge rectifier on ebay for $25 . The reason I want such a high amperage is because if I hooked up more than two M.O.T. (lets say 6) I'm not sure that a 12v rectifier will be enough. I'm pretty new to electrical design, but next semester is the beginning of my junior year as an E.E. so I have a basic understanding of simple circuits.

[@EduardoGonzalez-be6xe]

I get around 35 volts AC coming out of the transformers, when I run the output out of the transformers thru a 100 amp 3 phase rectifier I only get around 33 volts DC, I made a simple rectifier bridge and get around 53 volts DC. Do you think the 100 amp rectifier is defective or am I doing something wrong when I hook up the bigger rectifier.

[@electronicsNmore]

53 vdc sounds about right. You must be doing connecting the 100A 3 phase rectifier incorrectly. This is how you connect it when using 3 Phases: www.esru.strath.ac.uk/EandE/Web_sites/08-09/Hydrogen_Buffering/Images/rectifier.jpg You are going to take the AC output from the 2 transformers in series and the leads will be the 2 green arrows on the top left. Of course you are using a single phase, so the wires will not be tied together to the left of the green arrow. You can abandon the last set of diodes, or double up on lead leaving the transformer like I did. Thanks For Watching. Be sure to share my channel with others and rate thumbs up!

[@mbahmannz]

hello , do you have schematic diagram for this welder ? verry nice design tho

[@electronicsNmore]

Yes, in the video there was a link to my other video which gives the details and schematic.

[@MangMuang]

You need one more cooling fan for transformer......

[@Lorand24]

Ok, ok. Sorry, but i am not an english guy and i have learned the language almost by myself. Sometimes i make confusion between the numbers and the way they need to be pronounced like15 and 50.

[@ee99419]

What are those capacitors for?

[@sk1ppy506]

I apologize if this is a stupid question, but I decided to ask anyway. I understand that this circuit is around 52 volts, the capacitors I have, when put in parallel are 11000 uF (I think). Using an online calculator this gives me around 15 joules. is this enough energy to warrant using a bleeder resistor, or should I be safe. Also thumbs up and subscribed for the great video :)

[@electronicsNmore]

+Plazma “Mr Plasma-CRAZY” lasrer No need for a bleed resistor. I usually finish welding, then tap the electrode on the steel to quickly discharge the capacitors.

[@sk1ppy506]

Thanks :)

[@Lorand24]

If its corect than how can you have 86000µF and 80V? Its impossible. You will have the half value. Or maybe i get it wrong, in this case im sorry.

[@birdchaser2010]

simple but it works

[@electronicsNmore]

Yes, I use it all the time for jobs around the house. No problems yet, and I made this a while ago. I also added a SPDT switch with an oil filled 370V capacitor in series with the power transformers to reduce the power output for thin metal. Works good. Thanks For Watching!

[@eduardopinto8605]

showw magnifico

[@mainevilleprepper4885]

uF Stands for Microfarad.

[@electronicsNmore]

I know that. I say it that way(The way it is written on the capacitor), because it makes things easier to understand for an individual who does not know much about electronics. They post comments saying, "you mean that little u next to the uppercase F means microfarad?"

[@rodrigofriend5759]

whats difirent in a regular polarized capacitor then in a audio capacitor, cause a ifound really cheap audio caps, but im not sure if i can use them for welding

[@electronicsNmore]

+Rodrigo Friend A vehicle audio capacitor has a voltage rating that is too low.

[@rodrigofriend5759]

electronicsNmore but i found one thats for 100v, will it wotk?

[@electronicsNmore]

Rodrigo Friend Tell me the full rating.

[@rodrigofriend5759]

+electronicsNmore 100v 10000uf 105 degrees celcius and it says hifi audio on the cover

[@electronicsNmore]

Nothing wrong with using them. They are electrolytic caps.

[@TheNandopro]

can you use microwave compasitor's ? if so how many

[@electronicsNmore]

+nandos art Hello. No, you need to use high value electrolytic(DC) capacitors.

[@POSEIDWNAS13]

you have capacitors.. so it works like an inverter right ?

[@unlokia]

Weld Done! :P

[@electronicsNmore]

unlokia Thanks! Be sure to rate thumbs up, and check out my extensive video playlists.

[@unlokia]

electronicsNmore You missed my pun, no? ;)

[@electronicsNmore]

unlokia Well done as in cooked. :-)

[@jaimebetancourt9538]

Is genial AC }DC.

[@Ihavetruth22]

huge caps.

[@electronicsNmore]

I found them at an abandoned US military base in the Bahamas. I have videos showing that base on my channel. Thanks for watching and be sure to share.

[@Ihavetruth22]

hi. i dont think store welders use caps that big.

[@doorguner01]

I inherited a 3 phase 1970s cp-200 wire feed miller welder i converted it to single phase but i cheated i found a form online on how to do it! but it only lost about 15% of its output from doing so! not teabag!

[@davidsosa9562]

esto es pura paja mejor la de agua c sal

[@electronicsNmore]

Schematic & Construction Details are in this NEW video: watch?v=deMmVK67HO4

[@dwaynetheman7499]

I'm sorry but what good is the video if you do not show it working. It's just a bunch of talk..

[@harukoyama9515]

I was wondering what difference is there if I just take old electric cooktop. Connect 2 end with a wire to burn some red hot wire Is microwave mod any different then electric cook top ? Both is capable to deliver high amp?? Or not?