As a buzzbox it works but the electrodes are reputably shite
Looking at migwelder forum they suggest youll weld thicker material ok but it will not weld thin unless your already a skilled welder
As for the curremt , the duty cycle on the welder wont be long enough to trip anything. My 151te been butt welding 4mm plate out of my parents garage which is standard 13 amp , blew the fuse once when i did a long run along one edge.
Just fitted a 32 amp output in my garagefor my welder . It needs a 20amp output for max output on 0.8 wire.
I wouldnt waste my 20quid tbh. Itll sit in your garage and look ugly for years.