Mig build up on rusty ring

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At my sailing squadron we have race buoys, on the bottom of each is a 6" metal ring. A chain goes thru the ring and then on down to an anchor that holds it to the bottom. The chain constantly rubbing on the ring has worn a groove in the ring. I have been asked to run some beads on the ring to build up the worn down areas. Ring is steel about 1/2" in diameter and very rusty as it constantly sits in salt water. I have knocked off most of the rust and will use my die grinder to try and get the groove cleaned up in order to weld it up, but probably won't be able to get all the rust. Think this will be a pretty straight forward job with my Miller 211 mig and ER70S-6, and 75/25 gas? Any special wire I need to use or other prep needed? Thanks!Last edited by echosierra3; 02-06-2012 at 03:33 AM.
Reply:Just burn it in, if you end up with a lot of porosity, grind it out and do it again. Eventually the metal will burn clean and you will get a good bead
Reply:You might consider running a bead of stainless on the inside of the ring where the chain rubs.  The erosion of the metal is what speeds up the corrosion.  If you have a stainless skin then it will not rust and erode away.  It would not take more than two welding rods to do the job.  I wouldn't drive any distance and order up a couple of rods but if you have any on hand.....
Reply:Why not replace the ring?  If it started out at 1/2" dia, there can't be too much left to work with.My name's not Jim....
Reply:Originally Posted by ironmangqJust burn it in, if you end up with a lot of porosity, grind it out and do it again. Eventually the metal will burn clean and you will get a good bead