The Mot welder – it actually works, and pretty well. Average short-circuit current is 110 A. the output is not ballasted and would benefit from this, either some large capacitor or inductor. I used to weld 2 mm rods on it, but the current was too much – lots of splatter and uglyness. Plus the rods got glowing hot after about 1/3 of its length had burned. Now, 2,5 mm dia rods work excellent. They don’t start glowing, start up easier and leave nicer welds.