We have a worn Hilti diamond core bit. We've cut away 4" and have a new
4" replacement tip. They're magnetic hence deem them as steel. Being that the bits operate at ~ 2500 rpm we'd like to have as little rotational eccentricity while drilling for obvious reasons. Also as we'll a sound weld :>. We have mig, tig, & stick capabilty. Any help in selecting the proper / most successful technique regarding welding / fixturing would be wonderful.- posted
18 years ago