Factory disc brake rotor question

Found a bag of 10 factory (appear to be) wheel studs. They slide right in the rotor that had hub removed. Would a couple tack welds on each stud be good?
If I can, I will use the hubs from my front drums?

20210202_162055.jpg

20210202_162141.jpg

20210202_162226.jpg

20210202_162238.jpg