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Restoration & Repair Tips Board

Welding a cast sprocket

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Rob Mo.

07-27-2003 18:46:07

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If you can weld one thing, then weld anything that breaks. I'm talking cast sprocket on the machines of yesterday. I got a piece of a sprocket off of a combine feeder driver. Is that particular piece weldable & I don't have to worry about it the next time I use it?

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Farmer John

07-29-2003 10:26:28

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Re: Welding a cast sprocket in reply to Rob Mo., 07-27-2003 18:46:07

I use Super Missile Weld from my Hobart supplier. I have welded all types of cast iron and cast steel with this rod with excellent results. Always preheat.

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george md

07-28-2003 00:23:36

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Re: Welding a cast sprocket in reply to Rob Mo., 07-27-2003 18:46:07

Rob,

you will probably here a lot about how good nickel rod is for welding cast , but the best thing to do with ni-rod is to leave it in the box.
Cast iron comes in a stick some round and most square rods and is used with torch and proper flux. preheat the sprocket to several hundred degrees with large soft flame torch , then weld with medium neutral to slightly rich flame .Cool slowly I have and do use ni rod - but there are very few jobs that will weld as good with nickel as with torch, and even fewer that will weld better with nickel. I have most likely stirred a hornets nest here , but most of those that tell you how great ni rod is , have never tried acetylene / cast iron .

questions - email me

george

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Rob Mo.

07-28-2003 08:53:37

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Re: Re: Welding a cast sprocket in reply to george md, 07-28-2003 00:23:36

Thanks for your reply. There is one thing that has got me mind boggled. How good do these welds hold up under pressure? What is their cracking point?

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george md

07-28-2003 21:50:06

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Re: Re: Re: Welding a cast sprocket in reply to Rob Mo., 07-28-2003 08:53:37

Rob, The cast iron in the rod is as near a match to the material in the sprocket as you will find without going back to the foundry and getting some of the original pour . If you grind it so that you can get 100 % weld and do a good weld , it should be as strong as the base material . I do quite a bit of cast iron welding with torch andsome of it requires machining after welding,
and that is when you find out how well you did welding the piece .

george

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