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I Forge Iron

makeing jack hammer bits

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will this be used by hand or powered?  How thick will the parts be and what will they look like?  How good a welder is your uncle and what type of welding equipment does he have? In general I would sugfgest A-36 and be sure a proper preheat and post slow cool is done on the jackhammer bits.  They usually are 1050 steel and so not very fussy to work with.

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What will be doing the hitting then?  High powered needs a more professional set up than low powered.  Typical alloys for heat treated tooling are the medium carbon ones like 4140.  If you are following the discussion of using hydraulically driven a concrete breaker bit else where on this site it looks to be an S series steel.

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