Build a spot welder using the transformer from an old microwave & NY-D01 controller board

Build a spot welder using the transformer from an oldmicrowave.
Needs:
+ Transformer from an old microwave
+ Copper wire has 10mm in diameter or more
+ Wooden box, actually, it's a wooden flower pot
+ Timer Boards NY-D01, NY-D02/D03/...
+ 9v transformer
+ Switch, some screws,...
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The first thing we had to do is remove the secondary coils. I use a wood chisel to cut it out. Be careful not to damage the primary coil because we will need it.
Then we are going to rewind the secondary coil of the transformer. The fewer turns of wire increase the amps but lowers the voltage, and more turns increase volts while reducing the amps.
The thick wire is needed because It will be heat up and melt the insulation if its too thin.
Next step: Attach the components to the timer board as shown in my video then mount thetransformer, the timer board, power socket,...
I'm using this to weld nickel tabbing to battery cells so I've positioned the two welding electrodes side by side.
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