Thank you so much for your comments. here are personal answers and a link to my blog where I show pictures of my today's welding.
brainbug007 : thanks you for the tip. You are right, lowering the power was not worse, especially as I also lowered the gas flow (see my link to my blog for the details). I think it was one of the bad parameters.
K4KEV : thanks for coming back to me for this details. I definitely was wrong with these high settings and metal melting through the joint (I' too ashamed to show you the pictures of the blobs, you figured out it was bad anyway !)
AshG thanks also. It is more or less what I did today, but if I'm slow, there is a lot of metal on the surface of the joint, the bead is too big, as you can see on the link to my blog with the tests and pictures.
To all of you and anybody else : I've been practising with different settings and according to your advices today. I don't want to invade the forum with my pictures, so I published them on my blog, the link is :
http://vouchtroadster.blogspot.com/2...g-welding.html
If you can take the time to look at it and feed me with more backups and comments, it would be great.
On this thread of my blog, there is also a link to my introduction page if you want to know me a little bit more, and know where I come from, my background and so on, as I'm quite new on the forum.
http://vouchtroadster.blogspot.com/2...-about-me.html
(bilingual : in French and English)
Thanks to all of you.
Regards.
Sylvain