It's the holes wearing out so welding the bolt would be the opposite of a good idea, the place is old & believe me the door weighs a ton, like I could barely almost not even lift it by myself when one of the springs broke.
Also 6 months might have been an exaggeration but I need a proper fix, if the bolts come out the door panels goes skew & that'll either break the worm gear or the motor.
I've had to replace something or the other on this pos almost every year.
I'm sure the both-sided bolts would keep, just there's 4 to a hinge, 5 hinges per panel and 5 panels so 4 joins, I'm afraid I'm going to wear out my drill bits

(I'll prob only drill the side ones through but ya know what I mean & the door would look like a mediaval shield from the outside..)