All wires, power cable except for the sleeve were replaced and it became much more convenient to work. I cooked everything with a flux-cored wire without gas 0.8 and 1.0 mm. There is little slag, penetration is good. The current did not exceed 75A. This is quite enough for 3-4mm. Thin metal 1mm and thinner only with dots at a current of 10-15A norms. Cooks with electrodes much better than simple cheap inverters up to 12-13 The arc ignites easily, burns softly and stably even at minimum currents. Despite all the shortcomings, I do not regret the purchase.