I know that when I'm not using gas on my MIG, I should reverse the polarity.
The other day, I was putting together a very basic handle for the cart on which the welder sits, and I realised that I'd run out of gas.
I didn't even think about it (inexperience comes in here) and carried on - OK, there was smoke, and the welds were a bit more spattery than normal, but otherwise it all went OK. Only afterwards did I remember that I was supposed to have changed the polarity.
So, my question is - why does the polarity have to be reversed? And what difference would it have made if I had remembered?
The other day, I was putting together a very basic handle for the cart on which the welder sits, and I realised that I'd run out of gas.
I didn't even think about it (inexperience comes in here) and carried on - OK, there was smoke, and the welds were a bit more spattery than normal, but otherwise it all went OK. Only afterwards did I remember that I was supposed to have changed the polarity.
So, my question is - why does the polarity have to be reversed? And what difference would it have made if I had remembered?