I managed to test so far only on a wire with flux, it doesn’t turn out very well, it sprays a lot and the seam is bad. True, I am no welder. I met advice to use a wire with a diameter of 1 mm, and it seems to suggest itself, since when welding with a diameter of 0.8 mm, it is felt that there is little metal on the seam. But I haven’t found where to buy a 1 mm flux-cored wire yet, we don’t have it in the city, and with a cursory search on the Internet I also didn’t find where to order it.