As was said, 6011 are good for general tacking because they leave a concave or flat tack. They are also easy to restrike and you don't usually have to clean the slag off the tacks unless there's a a big blob of slag. For tacks that have to be twisted or hold a lot of stress 7018 should be used. Sometimes you can speed up just a little when going over larger tacks.
Your fitting looks excellent, everything looks nice and square. You might be burning too hot(145 is a little hot for 1/8" 7018) which is causing additional spatter. Your welds look pretty good with no undercut but there's a couple simple things you can do to make them look better. A DC machine would be huge advantage but you have what you have. You should you go backwards a little bit at the end of the welds to fill the crater in. A big concave crater, especially in a corner is good starting point for a crack to develop. On something you wanted real strong you could start at each end and leave the crater(s)in the middle of the weld. On a couple of your welds you missed the the very beginning. This could also be a starting point for cracks. The easiest way to solve this problem is to strike your arc ahead of the edge/beginning and once a steady arc is established, move the rod back to the front edge of the seam. It won't matter if there's an arc strike because you'll weld right over it 2 seconds later. For safety's sake don't be welding and especially don't do any grinding if there are any gas cans or equipment with a gas tank anywhere within 500 feet of you. This goes for any flammable materials. It looks like there's a snowblower, cardboard boxes and other easily ignited materials close to where you're working. One spark is all it takes.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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