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"I'm going to weld my control arms soon by myself. Also im going to get an extra set and ask my autobody teacher to weld my extra set"
Alright.
Make sure your autobody teacher looks carefully at both sets. Get some local expert opinions on your welding work before you bolt anything onto the car. I would also over-engineer the shit out of them for strength. You simply cannot afford to have your control arm(s) break while driving.