Fixing used Rotary cutter blades

[Arc weld]

It sounds like they are hardfaced or they're using a special steel. The welding shop is likely following a special heat treating procedure to repair the blades. If they aren't is scary!:shockedefinitely not something you want to try on your own. A broken blade can not only go through a tire, it can go through you.

 

[7879fordman]

They weld a new piece on the ends? Does it wobble or shake?

No it doesn't wobble or shake .

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[7879fordman]

It sounds like they are hardfaced or they're using a special steel. The welding shop is likely following a special heat treating procedure to repair the blades. If they aren't is scary!:shockedefinitely not something you want to try on your own. A broken blade can not only go through a tire, it can go through you.

Ya I don't know what they use or do .

But they have been doing it for as long as I can remember . I know my dad had been having them do it since the early 70's .

All do is take a set and tell them I need the blades built up and sharp and they do it .

Have never had a tip break and the hog cuts 3"-4" trees like butter .

And ya I wouldn't try it myself . But they know what there doing .

It's a third generation place . They have been in business a long time as a welding shop .

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[mikehaugen]

And ya I wouldn't try it myself . But they know what there doing .

It's a third generation place . They have been in business a long time as a welding shop .

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That is probably the key. No offense to the OP, but if you are coming on a tractor forum to ask what kind of rod to use, chances are you don't know enough to attempt a diy repair on something as potentially dangerous as rc blades.

 

[BeezFun]

The place where I buy my PTO shafts also repairs driveshafts by welding them and rebalancing. They do this on everything from dragsters to earthmovers. So welding a lawnmower blade seems reasonable for someone with experience.

 

[Shield Arc]

Different types of steel. A-36 to HY-80. There is more to welding than running beads.

 

[Ken45101]

Hmm we have had a local welding shop build up the tips of our bushhog blades since 1969 and never had a problem . They add about 4"s where we have a longer wear period . The look like a one sided axle . It's cheaper for us to just have two sets of blades and have them retipped than buy new all the time . And we get long life out of the retipped blades on staying sharp . Not sure on the steel that's used but it stays sharper than new blades .

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Wouldn't the "stays sharp longer" suggest a harder steel which is not as malleable and more likely to shatter? I'm under the impression that a more moderate steel is better all around in applications like this. I expect Bush Hog, Woods, Landpride, etc. have knowledgeable engineers who have optimized the steel selection in their blades.

 

[muddstopper]

Used to be a old machinst local that would weld blades together. He's been dead for 30 yrsd or more. I know he had a heat treat method he used but dont know what it was. He heated, welded, stuck in lime or sand to cool, and repeated. I dont know how hot he heated, what kind of rods he used, or anything like that. Never heard of any of his welded blades breaking. This is certainly not something I would attemp to do.