Spot Welding machine power

Thread Starter

minh

Joined Nov 24, 2010
25
Dear all,
I want to make a spot welding machine with a microwave transformer 800 E 120 vac 60 Hz (my house use 120avc 60Hz main power)
To solder 2 pieces of metal (cut from food tin cans) about 0.30 mm thick. Please advise me how many volts and amps out is need
Hope you understand my question and guide me. Thank you very much.
 
Last edited:

MaxHeadRoom

Joined Jul 18, 2013
23,906
You usually need as lowest turn secondary you can, think of the single turn secondary weller solder gun.
Don't forget to maintain a relatively high electrode pressure!
 

MisterBill2

Joined Jan 23, 2018
9,793
OK, you could use that transformer with a rectifier to charge up a capacitor , and then use the current pulse from the capacitor to do a spot weld. That could work rather well. But the capacitor will need to be rated for at least 1500 volts, which will be a bit expensive.
 

MaxHeadRoom

Joined Jul 18, 2013
23,906
OK, you could use that transformer with a rectifier to charge up a capacitor , and then use the current pulse from the capacitor to do a spot weld. That could work rather well. But the capacitor will need to be rated for at least 1500 volts, which will be a bit expensive.
That describes the capacitor discharge welder, which doesn't require the MOT sized TXFMR.
 
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