Well, be careful.
On a loader I had a 1/4" thick angle iron tack welded across the top edge across the bucket with hooks on each end for lifting. I tore it off. I don't weld and decided to bolt it on using five 5/8" bolts across its width. But to protect the thinner bucket steel, I used two 1/4" flatbars sandwiching the bucket, under the angle iron. All and all, that was the better part of 1" thick. I drilled a couple ok, put the bolts through, snugged the nuts to hold it in place. On the other three bolts, a couple of times my Milwaukee 1/2" drill bound up, stopping the bit in place, torquing me around when I didn't expect it. That was last fall and from time to time, my wrist still smarts if I have to crank down on something hard. I honestly think I cracked a bone, and not being in a cast, it took longer to heal, or never healed right. At least its not as sore as it was a couple of months ago. Roll over on it in my sleep, wake up and "YOUCH!!!".
Good luck with it, be careful.