from stick to mig

hi all, i have at last got my mig welder ! It is an argentine make so im sure you will have never heard of it but it has a 30 -180 amp range with seven diferent power settings. A good wire feeder, a stiching (is that what its called?) option and a euro conector.
first off thanks for the advice!
i had a day of welding today and after using a stick for so long i found it a real pleasure to use. no more scrubbing all the crap off the welds! YES!
I found it quite easy to make good looking welds straight off but when starting the weldould ping off or stick to the metal before starting the weld puddle. any ideas why?
could ir be because of grease on the metal making ir difficult to start the arc?
muchas gracias! thanks all !
Sorry about the dodgy writing my keyboard isnt working!

Try clipping the ball at the end of the wire before starting the next weld. Wire could also be a bit long if the feeder does not stop fast enough.

MIG needs the metal to be cleaner than stick welding. You might be fighting getting through the mill scale.