When you weld something like that mount that has a direction change in the weld, top and then down on the side, be mindful of that when you tack it up. Either put a small tack in the corner you can weld over, or put a large tack that starts on top and rolls down the side to the vertical.
When you get to the end of the vertical leg at the bottom, roll the weld around and under. Or, when you tack it, start a small tack on the inside and roll it to the outside and up slightly.
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