What kind projects can I make with this BIG transformer and its other parts? ONEAC Power Conditioner transformer

Hey... I'm new here and I will like to say that I like many of the cool things people are doing in this site and I will like try making some of your ideas someday...And thanks for posting them... =) . Ok
I have a power conditioner that has a big transformer and I wanted to know what I can make with it. This is the spec on the unit - BRAND is- ONEAC model# CS1110 its 50/60 HZ 1 phase. Power input 120 VAC 8.8amp Output 120 VAC 8.4 amp . Its a really heavy piece. What I will like to do is make a spot welder since I need one but I'm not sure if I can use this transformer to make it. maybe an Induction heater,Welder, I'm in for experimenting with something new...I don't want to take this apart yet until I know what can be made with it first because I know it may be worth alot more if I just sell it. I seen alot of cool things done made with transformers..Any suggestion and ideas will be appreciated . Here are the pics. thanks

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yeagerxp8 years ago
That looks like a isolation transformer, a good one too, If I were you I would not take it apart, could come handy in the future, as for welding you need from about 24 VAC to 28VAC and a lot of current say from 30 to 70 AMPS
PitStoP (author)  yeagerxp8 years ago
Come in handy? like for what? I would like to know what else can it be used for.. thanks
as an isolation transformer, it will isolate whatever circuit you are working with from the rest of the house. let's say you want to play with biofeedback, and use your computer to monitor, you plug your computer and circuitry to the transformer, this way if anything goes wrong with your circuit, you are isolated from the main power.
You won't get any more power out of the transformer than you can out of the wall outlet (power is conserved), and at that voltage you won't get much current (power = I*V). High current is required to make a decent welder, so what you'd really want is a stepdown transformer with a lower voltage and higher current.

Also, you have to be careful with it as it is high voltage, as careful as you should be working with wires coming straight out of the wall.

I'll guess what you have is an isolation transformer: http://en.wikipedia.org/wiki/Isolation_transformer
Sandisk1duo8 years ago
if you shorted the output, what would happen, would it trip a fuse?
PitStoP (author)  Sandisk1duo8 years ago
The unit works.. I never shorted the output on it.. and I looked in it but I don't see any fuse now that you mention it... what would that determine?
so that means that you have 1:1 ratio transformer if you shorted the output, you could weld with it the problem is that you need low voltage, high amperage to weld...
PitStoP (author)  Sandisk1duo8 years ago
what voltage do I need to weld ? and what els I can make with it?
you need like 0.5-20V to weld there isn't much you can make....
Don't you need high voltage to weld? How else would the spark jump the gap between the tip and the piece since air has a really high resistance? I believe to weld you need high voltage, low current, and I think high frequency helps, too. One another note, you could try and take out one of the windings and replace it with another winding with less turns. This would change the input:output ratio. If you decrease the turns in the input winding, the output voltage would go up (various high voltage instructables). If you decreased the output windings the output voltage would drop but the output current would increase (I don't know why you'd do this?) Also, replacing windings is probably much easier said than done...
For a welder, once the spark gets going it takes relatively low voltage to keep it going but requires high current. You are right about requiring a high voltage to create a spark between the materials, but most welders get around that by starting the welding distance at 0 by striking the material with the electrode to start the arc. More expensive welders will ramp up the voltage to arc from further away - however the breakdown voltage of air is really high (~3 kV/mm), so that isn't really practical for long distances.
Once the air is ionized as the electricity is arcing there is a very low resistance path through the air.