I have 2 problems, perhaps someone can help

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1) Whenever I weld a 45 (beveled) and grind the weld flat with the metal face, I wind up with these recesses.  I can grind them further and make them vanish but then if you put gloss paint on the area you can clearly see low and uneven areas. How can I grind the welds flat and even with the metal face without having dips? I've used flap wheels and hard wheels.  The areas in question are usually at the edge of the weld metal. Undercut? What am I doing wrong? Anything better than a flap wheel or hard disc?2)I'm still getting used to my new 220v welder. I set it per the door chart and welded vertical up on this corner. What are all the blobs? Too much wire feed? That wouldn't have happened with my 120v Lincoln but I was quite used to it. Attached Images
Reply:The blobs are from too much heat for an uphill weld on thin material. Stuff like that I use the zap-zap method, pull trigger and make a nice puddle and let off before it sags, move up a puddle length and repeat. Or if it's thin stuff learn to properly downhill getting good fusion.  The low spots just need slightly more fill without going overboard and needing a lot of extra grinding. And not all angle iron is perfectly flat across the flange.