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Spot Welder from microwave - how to increase the power
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- เผยแพร่เมื่อ 17 ธ.ค. 2016
- How to increase capacity. Grant Thompson unique Spot Welder and trying to understand why a smaller and 220V transformers to work not so good. How to solve it.
US and Europe are different transformers.
A few more facilities improvements.
Details from an old microwave oven.
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I'm glad that you credited Grant Thompson in this video.
Because he didnt credit anyones oroiginal idea in his videos so far.
thanks
Bravo! é 10 volte meglio di quelle che vendono professionali.
nice effort. thanks for sharing.
Brilliant video on increasing power. You have earned yourself a subscriber 😀
Great job and great experience
thanks
amazing idea thanks
Thats awesome.
wow , nice!
Genial...!!!
Thanks...!!!
Good effort
Very good , thank !
thanks
nice box looks like store bought!
Wow so powerful
Very good
Nice job, nice video.
thanks
Good good ;)))))thanks
Hello there I need you Advice I have this Stud welding matching that only work with High Voltage AC 380V 60HZ my question is,how to change the current to 240 volt here in USA to make work
Very, very good
thanks
Buen trabajo. tienes un gran resultado
Amigo que cinta aplica?
Thank you.
thanks
Hi mate. Great video. Can I use this to spot weld on car body as well. Will it be strong enough?? Thanks
I had noticed someone had built something similar and the transformer had over heated. and melted. Microwaves also have a cooling fan in them to keep things cool maybe you may want to address this situation before you might have some challenges. Just a thought. But nice build. I hope it works great a long time for you
he overheats on idle very fast.not for long use and must have cooling. cheap production result,not made to be on long time
Hi.i ,m Cosme Brasil i really liked it
thanks
Good work. 🙏 Gb
Nice technology good to you
thanks
one of the great channel on youtube who explain each and every steps . sir your videos inspire me a lot so i also made just have to test but need your advice what is the input current you are providing (input voltage 220v). what is the input current?? please reply as i cannot move ahead without knowing as it may be very harmful.please help sir.
thanks, blessings
You only need to stop weld from 3 to 4 seconds. No need to hold it until it glows yellow. Once it turns yellow it is to hot.
Thanks sir
ok
감사합니다 ^^!
Bhj mmmm
@@maribelllauren4201 ข
Nice work young man :)
Bro even I'm fabricating this type of machine for project to college
So I need help ,how can I contact u
I have a question. Do you put the breaker switch on the return cable or the main line to the transformer? I saw in books that you put the breaker switch on the main line, not on the return cable or the ground.... And thanks. It's nice to see that you take the time to explain your steps in the process of creating the machine.... Thanks...😓😓😓
Both switches are one after the other on the line where there is a contact socket 220v or 110v. Power line is 1000A ,3V can not be put there.
@@marisbuildsahouse4304 Thank you for your video. One question springs to mind is that you used a 120A CB in line but did you plug into a 30A socket? if so how is that CB going to be effective as the CB in your fuse-box would trip before your spot welder?
@@monajaat 20A
I am in the process of building a second battery tab welder. I have #2(2guage) welding wire and 2Guage battery cable wire. What would you recommend? I purchased both just to have on hand, just have no clue what to use on the second welder.
ok
Good
thanks
Did you remove the magnetic bypass also? In the first version I could see they were in place. They are the metal sheets between primary and secondary winding. They limit the current by allowing the magnetic field to take a bypass route.
I noticed that too. I know them as shunts and they were in place at first then later removed. This is why the nail melted, as amps increased due to their removal, not due to the extra turn which would have increased volts.
remove
@@mattmcgahan yes and no. The current is limited by the transformer but also by the resistance of the weld. In theory 1 turn should yield the most current but because the voltage is really low then, the resistance limits it more then the transformer would with more windings. Around 3 turns is the most optimal balance between voltage and current in a MOT spot welder
@@felixb.1756 That's right, and anyway, in any case you should try to use as thick cable as possible, why leave opening not used.
hi , very useful video you got there. can do so much things in my kitchen and garden. would it be possible for me to joint 3 mm to 10 mm bar for my bbq grill ? my gratitude sir
no, you need 3 transformers in parallel for that,
1 can weld under optimal condictions max 4mm (and you want 13mm in total)
:)) thanks
Great video!!! What kind of tape did you use?
What did you use to flatten the copper cable to make the cable lugs? Hammer it flat, vice to squeeze it flat or some other special tool?
The best option is to go to the electricians or traders who have a cable shoe press, it takes 2 minutes to press. Can be screwed, but not so good.
There are also special shoes with screws and knit head.
Excelente quitar el forro caben mas vueltas y genera mas amperaje gracias bro.👌
there is plate on the top of the bottom wire if u remove that is it gonna be ok ?
Thanks for sharing. looks like a good job. Did you measure the output voltage?
The transformer is taken from a microwave oven. In the first winding, the 20A switch is enough, but the second one is over 1000A. Thank you for your comments.
@@marisbuildsahouse4304 how old are you?
هل يمكن استخدام المكثف بدل المحول لهذه العملية وما هي النصائح
مرحبا
Is 3 turns of thick secondary wire too high voltage for 18650 Li-on battery spot welding? Most videos for 18650 spot welding use only 2 turns.
yes
Thanks , can uhelp me , im canuse eny transformer in macrowave ? if small can i usee ?
1000w ok
Good job ... whats the name of the on / off button?
"Hager" electric fuse switch
hi i made spot welder from 24volt TR 200VA original input is 400volt output 24v i revind and i put 230volt input and i get 1.2 volts out but not working small nail start to glow but not weldet
can i make it stronger somehow
like me. Need more winding in the secondary winding.
Dude I really like the way you did that. It is the way I would need to do it without a welder and a ton of other equipment. Thank you. Just one question though, would I be able to use it as a stick welder instead?
touch welding method
You won't as for as you need a higher voltage, you will need to make a separate welder, if you use microwave transformer, you ll need 2 of them, with more turns on the secondary to increase the voltage. Basically spot wlding: High amps, low voltage, Arc welding: Higher Voltage, lower Amps
To add to my previous reply, the cable you ll need for a spot welder will need to be much bigger in diameter since the current is much higher (probably around 400 to 500 amps depending on your transformer), however, typically arc welder have a 48V voltage output, ranging from ~60 to 250/ 300Amps output. The reason you ll need 2 transfo: it is unlikely you ll be able to re-wire the secondary with enough turns to obtain the voltage required and at the same time with a cable big enough to sustain the intensity (amps) required. So by having two transfor with the secondary wired in series, you gain basically twice as many turns or in order words, you can add up the power of the 2 transfo together.
high power ok 50mm2, but for the primary winding the original cable does not heat up, even the 20A switch does not turn off
The primary shouldn't be affected as it will always deliver pretty much the same current. I think it does matter when you have a smaller cable on the secondary ( like myself, with 25mm2), as you need to make sure that the current is not going on for too long. Though I like the way you managed to increase the power just by removing the insulation. Great job!
you can get heat shrink tubing in long lengths at harbor freight cheap, i would use several layers, is your primary 220 or 110, will 110 peimary work?
i have 220 but also work with 110.
110 primary is the appropriate number of turns and everything is ok.
Brillante el vídeo por los pasos, la corriente es de 120 O 220 ws
Power was increased because in version 2 you removed magnetic shunts (small plates between Pri and Sec coils)
Agree. Increasing turns ratio doesn't increase out power but voltage and lower the current actually. Now if he tries to change it back to 2 turns, he will get more "Power" (it's actually more current).
Actually.
Increasing turns make coupling more efficient.
More Volts on same length wire=More Amps=Increased Power. (As long as primary doesnt limit current, Which it shouldnt in this case.)
More volts=More current flow accross load(nail)
I tried secondary in short power and it wat 1400W with two shunts, 1600W with ony one and 1800W with no shunts with 4 turns at 3,5V so you are right, do you think lowering turns will help with current?
@@AntonChromjak yes its simple math. less turns -less voltage=more amps.
@@krlenjuska What the fuck are you talking about? V=IxR therefore I=R/V that means that fewer volts will deliver less current through an equivalent load. The reason you get more current out of the transformer with the lower voltage is due to magnet saturation of the lamination, IE you are operating under overload conditions, what you really need is a larger transformer. Look it up on "Da Google" or something.
Не будет ли перегрева в ящике при интенсивной работе? Он ведь практически наглухо закрыт, а дерево хорошо удерживает тепло.
I want to build a spot welder like this but set it up to weld mortice lock keys together to make my own keys. Do you have any suggestions on how to modify the welding electrodes to weld keys up from scratch, I know that most modern mortice lock keys are spot welded together in 3 pieces (a washer, a stem and a blank part that is cut to the profile of the lock levers) but HOW are these keys welded together using a spot welder ??
quite difficult, because the exact current must be hit
@@marisbuildsahouse4304 Hi, I've been working on building a butt welder instead which is what these key manufacturers use to fuse together the parts of a mortice lock key. It does require a very high current from a similar microwave transformer and also a timer to get the butt welds even and exactly the same every time when the key parts are mounted and clamped tightly in the brass holding clamps/welding jig.
Although my butt welder is not quite ready yet, As soon as it is ready and working , I will upload a video of it working on my TH-cam channel for everyone to see !
Did you remove the "magnetic shunts" in the first demonstration?
А что дает Вами увеличение витков?
You can use the condenser instead of the converter for this process and what are the tips
I use what I find in a microwave oven. Condenser for shorter welding with less power
after the modification + - what is adequate voltage?
Giop
Tell me the specification of transformer
Какое сечение провода использовали?
is it necessary to add and press switch while welding, what is the problem if we turned on the transformer for long time
problem due to lack of precision
Greetings from Colombia, how many amps and voltage this arrangement can generate, thanks
220 V, 7-10A generate 3V 1076A
@@marisbuildsahouse4304 not possibile.primary and secondary power must be same. sec power can only be smaller than primary
I just shortened the lead wires on mine and worked better. You increased the voltage with another turn thus shortened the lead wire.
FWIW, instead of electrical tape, try Googling "CID A-A-59163". That is the MilSpec for a self-fusing silicone tape that insulates to 400v per *mil*, and there are many tapes that more than double that rating. (It has been used since the 50's by the US military to protect the wiring of their planes, hence the nickname 'F4 tape', because of its extensive use on the McDonnell Douglas F-4 Phantom II.")
Its not the rubber cheap electrical tape, it's installation tape. Sort of the same thing you are talking about the he is useing. That's very interesting though never new the origins of the name cheers.
Thanks for that info. I was concerned about using electrical tape. That melts at a fairly low temperature.
Where do you get that stuff dude
What was the thickness of material welded
0,5-1.5 mm
where did u get that black cable did u get that from the microwave? How long the cable must be if u do 2 turn also if u do 3 turn thx
Black cable is from a stick welding leed. Or a groud leed. Can get it from a welding supply store or maybe a car stereo shop the wire from subwoofer amplifier to batteries
i am doing the same project when we using this spot welder the transformer get heated up and insulation will be meltoff it may damages wire how to solve this problem
large cross-section of the cable and the cable must not be taken to be too long
after some time the need to make a break
1. max out the space on the transformer (thickest cable which fits
2 replace the insulation with glassfiber sleeve
3. add heatsink + fan
4 keep cable short
5. dont operate too long , its called "spot" welder not stick welder :D
Hi , What was first V & A and second V & A
primary winding - spiked 220 or 110 V secondary cable in some windings for welding
You should NEVER use a breaker for an on/off switch. You can use a regular light switch and I recommend you do.
Thank you. This is for safety. At rest at this stage very little A, not even 1A. The working position is not more than 20A.
Rockyj jones : And why not ? please tell why you shouldn't use a breaker switch ?? it wont hurt a thing ! it will be completely fine ! Dam I hate when people gotta act like they know what their talking about when they have absolutely no clue !
@@stevelamperta865 they must be an armchair electronic wizard
Which power MCB required
power - 1082 A
if you have space for the cable may not be taken out, I got extra space
Beautiful job.
I use 4 gauge on mine but I thing the power is lower on mine.
Cheers.
Класс
On what does the amperage depend?
16A in inside / on other 1000A
I would use heat shrink tube.
An old Hi amp starter relay would work also
work
Man kann auch noch die Einlagen (Blech Streifen) zwichen Primär- und Sekundär Wicklung entfernen, da hat man noch mehr Platz.
hey, I also build one, however my cable gets very hot and it isn't melting. I don't know why but it seems like to be in the cables. I've got 35 mm^2 cables but they get so hot. but when I put a metal plate between it won't meld. please help me? what could be the problem?
Du musst 50qmm Kabel nehmen!
Qual espessura do cabo ? mm
have tried silicone electrical tape
Was that 220 v. Dude
as it is AC, I'd guess it may work with aluminum too? PS no fan?
aluminium has more loss than copper, it is now recommended because it has higher resistance,
and at high currents every small resistance will affect the performance.
yes
ខ្ញុំចូលចិត្តជំនាញទាំអស់ នេះ ព្រោះសំខាន់សម្រាប់ជីវិតខ្ញុំ
what is the diameter of the secondary cable
35 mm/2
What was the Amp Rating on that Micro Switch ? That gave me the Creeps.
They're about 15 ampres in America. I used one and it welded the circuit into the on position. I'm currently looking for a new switch, no pun intended.
LOL, Yep. Easy fix ! www.ebay.com/itm/Output-24V-380V-25A-SSR-25-DA-Solid-State-Relay-for-Arduino-Raspberry-Pi/321873890198?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
Its the same switch from the microwave. Its just letting the 15 amp from the wall outlet into the primary coil.
How can increasing the turns of the secondary coil increase the ampere? That only reduces the ampere and increases the voltage of the secondary coil.
Note that, he reduces the cable distance, then the resitence is low. I dont belive that it is relare withnincrease the volts.
@@TheHeliosm He uses the same cable for the two trials on the secondary coil. Therefore, the resistant is unchanged. When he increases the turn of the secondary, he reduces the ampere. He needs higher ampere in the secondary coil to heat up the objects quicker. To increase the ampere he had to reduce the turn of the secondary coil. According to the physics if I make the turn of the secondary equal to the turn of the primary coil, both of the coils have the same voltage and ampere (if I did not count the loss of energy creating heat in the metals). If in the same coil I increase the turn, I increase the voltage but the ampere and vice versa. I am going to find a transformer to try and see what will happen. Thank you for your interesting.
Yes, but the conductor have less resistence it is shortes, out of coil. For other hand , you have less current but the voltage increase. Take in acount that inportan is the power. I did experience 10cm can reduce de power in the load from 600w to 300W
@@TheHeliosm I get what you mean. I agree with that.
its real
What is the purpose of the shunts
to limit power of the transformer.
Wow 400k viewers... I guess I'm not the only one with a crappy 220V microwave spot welder.
I think out of the 400k 1000 made one
And 900 of those 1000 made at least two
What kind of tape is ?
tessa thermo
How many amp
You don t cut the top part batter than metal
yes
What kind of thermo isolation please? Name of the producer please, can not find on market. Thank you.
"Tesa" cloth insulation board +125 C
Found it. Tesa. But how do you know is thermo isolation tape? Thanks. Also, at min 13, to avoid sparks, you must put pressure on electrodes. There is a resistance welding tutorial on yt, they say the pressure is important. Also, too much pressure is not good.
Maris Builds a House thank you very much
Please, do you know how many Watts is the transformer? And what gauge or mm2 has your cable?
The microwave oven was 1200W, the transformer was about 1000W, my cable 35 mm2, if you can get 50mm2 is even better
Thank you!!
ah i was about to ask this.... hahaahha answered.... thank you sir.
220 V, 7-10A generate 3V 1076A
Math doesn't work here ;)
10A * 220V = 2200W
3V * 1076A = 3228W
You are getting 1028W out of space ;)
Not good Idea to hide spotter in the box, still question is how to increase power
What size is the wire
I have 35mm2 but better 50mm2
Maris Builds a House شكرا
Thanks bro
Hey, very nice video!
There is one thing you got wrong though:
The reason why you had more power after you changed your setup was not because of the additional winding but because you remove the metal that was between the primary and secondary!! This metal doesn’t look like much but it has a very strong effect! It is used to reduce the output current of the transformer by giving the magnetic flux a side path. Here is an interesting read in that topic: info.ee.surrey.ac.uk/Workshop/advice/coils/leak/weld/index.html
Long story short: if you want full power out of your transformer, make sure there is no metal between primary and secondary coil!
very interesting
Actually, nothing was changed in the transformer core when he increased the winding by another turn, so the amount of flux remained the same.
What happened when the winding was increased from 2 turns to 3 turns, the voltage at the secondary was increased by 50%, which helps to overcome the current due to resistance.
Ohms law: Voltage = Current x Resistance or Current = Voltage / Resistance.
No kuller? Hoot boom
Good morning
hi dear
nice job
if i want to buy this Spot Welder you have made
how much will it cost me ?
thank you
In Store - $ 200 -300, if you make it yourself and have a transformer or old microwave oven then $ 30
I do not have the required tools
I have no background about electricity
if you can make another 220 volts and send it me
i will buy it
regards
Thank you for the evaluation.
At present time I am working on existing this year projects and yet do not have time for this work. Shipping would also be difficult. Where are to be sent? Maybe better to look for master closer to your place of residence.
Thank you very much
I will get it by any means
best regards
actually your transformer puts out approximately 800 to 1000 Amps so for that current the cost will be much more than $300.
50qmm Kabel und 3 Windungen, das sind die entscheidenden Heinweise!!!
You actually didn't increase the power, you increased the voltage. However the amperage dropped proportionally as well. The power output, or wattage, remained the exact same either way. When you increase the windings, you increased the voltage, but lowered the amperage. You don't get something for nothing. And the output wattage has to equal the input wattage. Again, you don't get something for nothing.
Yes, the voltage stays above 1 volt, while the metal melts at the moment, so we say that the power has become larger (in plain language)
You had to criticize to get your 2 cents...lol He got the results he wanted.
Would a dimmer switch on the ac side work to regulate the weld
I built a spot welder that has a glorified "dimmer switch" on the primary. I linked the source in my video on my channel. Its SCR based, and there is a lot of info as well as new pre-built controllers that the guy is now selling in the link I provided.
Actually you've got it backwards... he decreased the voltage but increased the amperage. Before the secondary was switched out for larger cable, the voltage was high and the amperage low. By changing out the secondary he essentially reversed what the transformer was meant to do and raised the amperage but lowered the voltage to probably around 2v
Should shrink tube instead of insulation tape
yes
price
nor for seling