I have been using my recently bought SIP 130 MIG welder over the past
couple of weeks. At first I used it in'gasless' mode with cored wire
but in the last few days I've been in a sheltered area so switched to
working with gas and ordinary wire.

When I swapped over I forgot to switch polarity and I didn't notice
this for quite a while. I did eventually realise and changed to the
correct polaity. To be quite honest I couldn't really tell the
difference, what effect does the polarity have in MIG welding?

--
Chris Green )