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Tool Talk Discussion Forum

narrowing a cutting edge

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djw

04-28-2008 06:46:22




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I recently bought a tooth bar for my loader at an auction, and of course ,its 3 inches to wide. I tried cutting a section out with the power hack saw but appears to be hardened [barely scratched it] also wondering, will I be able to weld hardened steel if I do get it cut? thanks Dave




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Bus Driver

04-28-2008 15:12:25




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 Re: narrowing a cutting edge in reply to djw, 04-28-2008 06:46:22  
Plasma cutter.



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Clem Yates

04-28-2008 09:04:04




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 Re: narrowing a cutting edge in reply to djw, 04-28-2008 06:46:22  
Having fabricated, repaired, rebuilt, and maintained plenty of buckets, both loader and backhoe, I always treated cullting edge as I would any steel used for such.

Cut with a torch.

Tune with a grinder.

Weld it with 7018.



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135 Fan

04-28-2008 09:17:02




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 Re: narrowing a cutting edge in reply to Clem Yates, 04-28-2008 09:04:04  
I agree with that. Cutting edge is higher carbon steel so it lasts longer but is very hard to cut without a torch. A torch could care less how hard it is and will cut it the same as if it was mild steel. A cutting disc in a big (7 inch) grinder could cut it if you don't have a torch but it will take a while. Don't heat it up. It might also be heat treated. 7018 would be a better choice for welding than MIG if you have a choice. Dave

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trucker40

04-28-2008 08:59:34




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 Re: narrowing a cutting edge in reply to djw, 04-28-2008 06:46:22  
Ill take a try at it,but I am not an engineer,expert,or anything else.Somebody will come along and say you can heat it to a certain shade of red and weld it and then heat it back up to another shade of yellow and it will be fixed.I dont know.If its hard surface on the edge or something,I dont think you can weld that,but you can cut through the hard surface with an air arc and weld the steel underneath.Hardened steel can be welded,such as armour plate.Other kinds of hard steel,or alloys might be different,and could require that you heat it to a certain tempature.There are wax pencils like that you mark the metal and when it melts its been preheated enough.Heavy trailer axles are supposed to be welded using these.I have welded loader and backhoe buckets up useing a Mig welder with .035 wire and it worked.Best my poor brain can do,somebody that knows more might have a better answer.

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djw

04-28-2008 15:06:24




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 Re: narrowing a cutting edge in reply to trucker40, 04-28-2008 08:59:34  
thanks guys, i'll give that try



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