Offroad-Express

after a few deep river drives, in turangi and national park , changing oil in the diff is a hard job as plugs are all banged up, pulled one out of my old old diff , garage has got hold of another , will weld rings on to protect these ones .
they will be 55mm ID and 65mm OD ten mil thick

Are the plugs that are getting damaged to "drain" plug or "fill" plug? (I'm sure it will be the former,but thought I'd ask.
Given the welding in a "diff shave" can often cause the diff to bow slightly, do you foresee any possible issue welding these protective rings on, or not going to be a factor?

it's a slow job welding with, the renforcments of the front diff,rings are the same,
small welds let each cool before the next