Spot Welder from microwave - how to increase the power

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.

Previous video and Tricks:
https://www.youtube.com/watch?v=VE64cIdLOKw
https://www.youtube.com/watch?v=UKHyEg9vxrs
https://www.youtube.com/watch?v=z5vBt6Jj7XA
https://www.youtube.com/watch?v=jtX11xG_BgI
https://www.youtube.com/watch?v=D0jDCPaTTXQ&t=9s
https://www.youtube.com/watch?v=uHroFcKKNQ4
https://www.youtube.com/watch?v=HrkWY6gh0dA&t=7s
https://www.youtube.com/watch?v=34idocD7I3Q
https://www.youtube.com/watch?v=EWf0qNfdOcs&t=2s
https://www.youtube.com/watch?v=XQ0xJo5j7UU
https://www.youtube.com/watch?v=p9PjxeElPk8&t=6s
https://www.youtube.com/watch?v=3k_wcpLsO6s
https://www.youtube.com/watch?v=9mn7g59AEPQ&t=237s
YouTube Audio Library " Hear The Noice" John Deley and the 41 Players
"Hit My Soul" Silent Partner

Видео Spot Welder from microwave - how to increase the power канала Maris Builds a House