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rebuilding edge of mower blades with weld
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Posted by ironhoarder on April 26, 2006 at 07:48:32 from (64.236.208.25):
I was sharpening a neighbor's bush hog blades last night. These things were worn down to the point where the "edge" was essentially about 3/16" radius. Rather than grind all that metal away on the top in order to get back to an edge (which would have taken hours), I decided to build up the edge with my MIG welder. I laid a bead down along the edge, reduced current and laid another bead, reduced current really low, laid another bead. I ground it all back, and patched missing spots. It came out extremely well, but I wonder if this is common practice and if there is a down side? Did I destroy the hardness of the edge in the process of all that heating? Further, are mower blades ever hardened to make the edge last longer? If they were hardened and not annealed, I could see that being dangerous if you hit a rock and the blade shatters.
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