Spark plug welder - video

[nova_robotics]

Hardly the AA battery with blue flame shooting out.

I don't know enough about spot welding or batteries to comment otherwise.

No current limiting and they're going to melt those wires. It would be very difficult to not burn through thin material. Little battery tab spot welders are pretty cheap on Amazon. I bought one. It works good. It has a dial on it for the amount of heat so you don't burn through the material.