1)Are you wanting to build up the cutting edge plate(you can buy it in 10' lengths), or 2) are you repairing the bucket itself?
The cutting edge is hardened, but the bucket is probably plain mild steel. I tore the teeth and part of the bucket on my father-in-law's frontend loader and I had to repair both the cutting edge and the bucket. I had to weld up the corner of the bucket where I tore off a corner tooth digging up stumps. But he had bought extra cutting edges at an auction, so I just replaced the cutting edge, rather than repair it. I gouged out the old bucket metal out from in the tooth and saved the tooth in case we need it later, but replaced it with a new tooth he already had in his shop. Used a 7018 to repair the bucket, it's still holding up well. I hung that new tooth on some big stumps since then.
He also welded a 1/2" square bar x 12" long on each pad in the tracks because it had turf pads on it. The added traction was needed pushing the stumps. Those are hardend too. I'm not sure of the rods he used on the tracks, I wasn't present when that was done.
There are some people that monitor this BBS that build or work on this type of equipment, maybe they will share some ideas.
John Wright