Put 25V into 90000uF, but unlike the goo tube videos, it didn't weld anything but the electrodes to the material. They just show thin battery tabs being welded, but not 1/32" tin.  The energy is probably being dissipated in the contact resistance.  It would need a very expensive switch to work.

Why do you need a spot welder to make sandals?  The best way to join titanium is welding.  Lacking any money, the most promising method is riveting. 

The only titanium a lion ever saw in real life was a static A-12 display in LA.  It was entirely bolted.  Not sure why it's covered in indentations.  They might have added strength.

Progress with teflon mockups continues to slow, as the mockups last ever longer.  Better knowledge of paw wear evolved it into a wedge shape & just a small tab glued over the wear area.  The glue lasts longer than folded teflon.