Hi folks. I'm brand new to mig welding so don't shout at me. I've done a lot of arc welding in the past but just bought a second hand Wolfweld Turbo mig 105 for £50 to patch up my mrs' car for its MOT. Anyway, I played around with it today and I must admit I'm pretty impressed with the quality of welds it produced. The problem is; it has 2 switches on the front panel; one is marked 'min' and 'max' and the other is marked '1' and '2' and I have no idea what they do. I messed around with them and the wire speed until I got decent welds but I have no idea what I was doing by changing these switch settings. Needless to say the welder came with no instruction manual. Can anyone tell me what these switches do and the correct way to obtain the correct settings? I've attached a picture. Cheers.