Always tack the ends first. Then if you want to run a bead you can start "back" and run it to the tack. That keeps you from blowing out the ends when there's nowhere for the heat to go.
With aluminum it's very important to "finish" the weld with an extra dab of fill and back out of the throttle so as not to create a crater which WILL crack.
Glad to see you got it.
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