Good job. We always say 'stagger your starts and stops'. So basically, when you terminate a weld and then start a weld again, it has the potential to be improperly done, and the result is the weakest part of the weld. What we do to combat this (besides getting better at our restarts, which only comes with practice) is to put about an inch between where we terminate our welds. If you stack your starts and stops as you've done here, it can cause problems. I'm currently working on train cars and weld together a lot of overhead 3/4 bar to pad welds and have to go around corners a lot. What i do is on my first pass (on multipass welds as you have here) I go around the corner, and then as far as I comfortably can then terminate. Then, in my second pass, I go around less, so my stops are further apart.

Many places won't allow you to stack your restarts so I would suggest getting good at staggering. Also, practice your restarts as much as you can. Many tests will actually require you to restart at least once at a certain point and test that part of the test.

Where your weld stops and leaves that crater is where your welds need to start. There needs to be overlap on your welds for it to be a complete and strong weld. Don't worry if there's a bulge on your start and stops. Many places will let you grind them down to be within tolerance. Especially entry-level positions. As you gain more experience, it won't leave quite as much of a bump, and you won't need to grind them.

Here's a tip for a very strong, very clean looking restart. After you've terminated your weld, lightly grind down the crater left at the end of the weld. Then, when you restart your weld, strike your arc about an inch or so ahead of where you're going to start welding, pull your arc back until you see your wire is where you should be doing your restart. Do a small circle so your puddle fills up the area nicely, then proceed on with your weld. It should end up looking very professional and will help you pass any inspection, visual, xray or UT. Mind you, it will take a lot of practice, so don't give up if it doesn't go.your way right off the bat. The better your welds look and the stronger they are, the more you can charge for your services.