Welding a 4" core bit

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I thought some might find this useful info. I had bought a 4" concrete core bit in a yard sale for $10. It had the drive end broken off inside the threaded end of the core bit. My hammer drill is a 1" millwaukee SDS drive. I could not find an SDS drive that would fit this core bit. So I cut the shaft off an old 3/4 SDS masonary drill. Took my Hobart 187 mig and turned up to #6 with about 30 on the feed for .30 wire. Carefuly tacked welded around so it would stay true on the core bit. Then welded short beads side to side to keep it from warping off. I did not think this trick would hold under the amount of force from the hammer drill. The shaft was a little off and made the tool wobble during the drilling. But to my surprise I was able to bore through 10" of solid cement with out the weld cracking. So if there are any back yard welders like me out there you can count repairing masonary tools with your mig.Embrace theTea Party movement. Congress! Restore, Honor, and abide by the Constitution of the United States of America.
Reply:Oh we need pictures of that...Miller thunderbolt 250Decastar 135ERecovering tool-o-holic ESAB OAI have been interested or involved in Electrical, Fire Alarm, Auto, Marine, Welding, Electronics ETC to name a just a few. So YES you can own too many tools.
Reply:a 4" core bit on an sds drill? no base? wet core or dry core? if i was asked by my forman to core through a 10" slab with a 4" core on a hammer drill, i might have laughed in his face... if that thing ever caught the OP would be in some serious pain.Pipefitter/Welder- Pipefitters Local 537 BostonAmerican by Birth, Union by Choice4th Generation member Local 537
Reply:I am still amazed that a core bit works at all let alone on a sds hand held. Used a 6" that we held in place with a backhoe to get down pressure. Just dont tell the rental guy.Millermatic 252millermatic 175miller 300 Thunderboltlincoln ranger 250smith torcheslots of bfh'sIf it dont fit get a bigger hammer
Reply:Originally Posted by technoidI thought some might find this useful info. I had bought a 4" concrete core bit in a yard sale for $10. It had the drive end broken off inside the threaded end of the core bit. My hammer drill is a 1" millwaukee SDS drive. I could not find an SDS drive that would fit this core bit. So I cut the shaft off an old 3/4 SDS masonary drill. Took my Hobart 187 mig and turned up to #6 with about 30 on the feed for .30 wire. Carefuly tacked welded around so it would stay true on the core bit. Then welded short beads side to side to keep it from warping off. I did not think this trick would hold under the amount of force from the hammer drill. The shaft was a little off and made the tool wobble during the drilling. But to my surprise I was able to bore through 10" of solid cement with out the weld cracking. So if there are any back yard welders like me out there you can count repairing masonary tools with your mig.
Reply:Demonstrates what ya can do with care and patience.