weird welding?!?!

[rapidtornado]

Guys
Looking for a bit of advice, I gave my beloved welder an early christmas pressie as I haven't used her for a while and treated her to new shroud, nozzle, wire and tank of CO2/Argon

Ran a few beads with power set at 4 (range 1-6) and speed at 3 (range 1-10) and got OK results, played with power and speed and got a decent penetration bead (see attached weld 1)

I then used the same set up and ran a bead on a join and got horrible holey welds (see attached, weld 2)?!?!? any ideas/suggestions as to what's gone wrong here?

Apologies for the poor quality pics off the BB

Rapid

http://i1142.photobucket.com/albums/...0Car/weld1.jpg
http://i1142.photobucket.com/albums/...0Car/weld2.jpg