Thanks, I actually paid $25 to have this welded on I have been using it for a while but I guess I didn't look that close because I don't remember it looking like that. I may scrub it up with some barkeepers friend like Yuri says.
my HLT and MLT will have weldless fittings on them.
I wish my current BK looked that good... I've been using it for a while with no problems.
I'm in the process of building a new system and currently looking for someone to do the welding so it doesn't happen again.
At this point the acidic wort has removed the soluble iron from the surface and other than cosmetic appearance it's ok. If you having troubles with cleaning, a bit of time and a couple dremel grind wheels, you can cut the sugaring back to base metal again, then apply a paste of BKF and leave it for a day or two to repassivate.