Be wary in doing that good sir. you must pre heat a piece of aluminum that large to about 4-450degress for about 20-30 minutes before welding it, and then bring it down to cool slowly at a timed rate post weld. not doing do will make the lip very brittle and subject to failure under load.
Something we do day in day out repairing aluminum heads. shitty work but it’s the only way to do it properly unfortunately though.
Aside from that, the final wheels look REAL good compared to what they were at first sight in OP. Good work right there :thumbup