Depends on what kind of welder he is using and just how sound his welds are. Anybody with a helmet and a welder and a bit of practice can burn a frame together its just a matter of how long it lasts. I'm a certified welder and chassis fab isnt something you can just pick up overnight it takes alot of skill to properly weld a cage. I've seen shitty 115v welded cages come apart at the seams from regular stress. If youre gonna track the car leave the welding to a pro, if you ever roll it you'll thank god you did.