Purchased 8 3/4 rear I need some help

I saw that to its just dust I wiped it and the color is even. I think he did an "OK" job welding it just the clean up was not done. Sometimes an ugly weld is a good weld. I emphasize the sometimes. We'll see though. I did pop the slag out of the bearing and seal hub. wasnt as bad as I thought. now I just have to clean the tubes out and start building once I know for sure its straight.