Trencher teeth

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My kid brother was trenching a water line a few days ago, he got into some rock.   Is it possible to hard face these  teeth to get some more use out of them.   It appears someone already did this previous to our purchasing of the trencher.   After greasing the machine when I got it back to the shop, it appears that on some of the teeth the hard faceing was taken off down to the bare tooth metal.   What rod would y'all recommend to build the tooth back up?   Thanks  again for looking.Miller BobcatHarris cutting outfitMiller spectrum 625 plasmaVariety of shopmade tools
Reply:if stick welding i would use wearshield me or wearshield 60. if mig welding could go with something like lincore 50
Reply:I will be stick welding. I have never hard faced.  Any tips for a rookie.Miller BobcatHarris cutting outfitMiller spectrum 625 plasmaVariety of shopmade tools
Reply:If they have been hardfaced already you will have to make sure what you use can go over hard faceing some can some cannot.Millermatic 252millermatic 175miller 300 Thunderboltlincoln ranger 250smith torcheslots of bfh'sIf it dont fit get a bigger hammer
Reply:yup. itll tell you heat range on packaging of rods. but you can just run stringers (drag technique). search on here youll see different patterns to run. post up a pic of teeth we can help you out a little betterR.T. Welding LLCOn Site ServiceColumbus, NJ
Reply:Why not just replace the teeth?  Thats what we usually do, I have heard of hard facing the shanks but never the teeth. (I am an excavator operator)Miller Dynasty 300 DXMiller CST280Miller Maxstar 150 STH
Reply:Originally Posted by SilveradoWhy not just replace the teeth?  Thats what we usually do, I have heard of hard facing the shanks but never the teeth. (I am an excavator operator)
Reply:Just did this kind of hardfacing work on a neighbor's trencher.With his, there were carbide tips on some of the teeth. While worn, they were still serviceable as is. Unless the carbide teeth are totally gone I'd leave them alone if you have them.The other teeth were "cup teeth" that were fairly well worn out but some could be saved. A few new ones were purchased and they had a bit of hardfacing  (see photos in link) so were used as a model.http://www.replacementdiggingparts.c...tml#anchor_215The saveable cup teeth were built up a bit with 7018 and then Stoody 31 was used to coat the surfaces as the OEM teeth were done. Tungsten rod could have been used but it is quite expensive. This job was a bit of experiment so next time things may be different.As for hints: Hardfacing is usually a flat weld only issue - it flows easily and freezes slowly with little flux. At least two coats should be applied to maximize the hard in the top coat. A single bead will mix with the base metal and be diluted. A second bead will still be diluted but to a much lesser extent.You are not looking for much penetration. Hardfacing should lay on top of the base metal.The repaired cup teeth have resisted wear very nicely in rocky ground. The neighbor had a least 1000' of water line to put in for an orchard. There was still considerable hardfacing left on the repaired teeth while on the new teeth the hardfacing pretty well scrubbed off.Last edited by GWD; 07-16-2013 at 07:38 PM.Reason: grammar
Reply:Thanks for the replies.   We don't use the machine daily.   We've had it a out a yr, it was a little rough when we bought it, but we didn't give much for it.  I am gonna try and get through the summer with this chain, late this year I am planning on a new chain, sprockets, and teeth.   This is just to get me by till then. Thanks again.Miller BobcatHarris cutting outfitMiller spectrum 625 plasmaVariety of shopmade tools
Reply:Hey JW3 did alot of hard facing on hammer,s  in a rockcrusher when I worked at a cement plant years back. Make sure you wear a respirator, that rod is full of nasty metals. We always built them up with 7018 and then went over them with hardfaced. Its true about welding in the flat postion. Good Luck