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welding cast iron

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patsublett

10-24-2006 16:50:19

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I have a cast iron pully that I need to weld a bushing in. The cast iron is high density. Is there anything special that I need to know about welding it, I dont want to ruin it.

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msb

10-26-2006 18:20:35

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

Do not use a grinder on cast.Either chip it out or use a coarse file on it.Grinding cast causes the zinc to smear or it drives the zinc out of the parent metal, according to what I read years ago in a welding book.If that is not right, I plead old timers disease.lol,bob

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mjbrown

10-25-2006 10:34:06

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

Most bushings are bronze therefore not weldable. If that is what your doing I vote for the machine and press option. Probably the best option also if you are putting in a new steel center due to wear. Another possible option is to clean up the hole in the pulley real well with degreaser if needed and fill the hole with epoxy thickened with bronze powder. Drill the hole in the center after it has cured.

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135 Fan

10-24-2006 23:47:23

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

Cast Iron welding is considered specialty welding most of the time. Simple things can be welded satisfactory. Why not get a machine shop to true the pulley and machine the bushing for a tight fit and press it in without heat? You could even put some lock tite or similar sleeve retainer between the pulley and bushing. Just a suggestion. Dave

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MikeCatthemuseum

10-24-2006 22:19:55

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

I'm with the shrink fit crowd if that is feasible.

Unless you are a very sharp welder you will do no good to that pulley by welding on it. Not trying to be insulting, but if you have to ask, you probably don't need to be welding on it if it is something special.

The other possibility would be either brazing or silver brazing the bushing in there. Either way, you need to preheat this thing to where it is nearly dark red, barely visible in a darkened room and then start your brazing. Lots of flux so that the pulley wets out real good and sucks the brazing material into the joint... just like sweating copper pipe.

I also built up a very badly worn bearing in the rear wall of my 1918 L&S lathe by building up a braze weld inside the ruined cast iron bearing and boring it back out with a boring head on a mill, lathe would work just as well for a pulley. Just ideas.

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Bill WI

10-24-2006 19:07:11

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

Consider boring the pulley .001 per inch smaller than the bushing and heating it to 500 degrees or so and putting the bushing in the freezer for awhile. Shrink it on. Much more accurate depending what you need it for and speed used.

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strawbale

10-24-2006 18:00:45

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

is the bushing you are welding in it also cast iron, or is it steel

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varmint

10-24-2006 16:52:27

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Re: welding cast iron in reply to patsublett, 10-24-2006 16:50:19

preheat it, weld it & throw it in a box of sand - let it cool out

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