johnq
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| posted on 12/1/11 at 11:48 AM |
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CAST IRON
Hi all ,just snapped a casting on my pillar drill, any ideas on a repair plan , can cast be welded brazed etc, thanks in advance,john
looks like rain again
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JAG
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| posted on 12/1/11 at 12:23 PM |
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It can be welded but is VERY specialised work.
There may be someone on here??? You never know 
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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blakep82
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| posted on 12/1/11 at 12:26 PM |
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as far as i know it has to be heated and arc welded? in fact www.mig-welding.co.uk has something about it i think
http://www.mig-welding.co.uk/welding-cast-iron.htm
[Edited on 12/1/11 by blakep82]
________________________
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David Jenkins
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| posted on 12/1/11 at 12:36 PM |
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Brazing or silver-soldering would be the easiest, as long as it would be strong enough. It does work well, as long as the surfaces are really clean.
Trouble is that you'll have to get the whole piece up to red hot to make the join!
Welding is difficult, IIRC. You will probably have to heat up the whole piece before welding, otherwise the localised shrinking around the weld will
just break the iron somewhere else nearby. I'm sure that someone else on here will know more than me though (not too hard...)
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martyn1137
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| posted on 12/1/11 at 01:29 PM |
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If parts are very clean and have relatively large contact area you may get a better result using epoxy resin glues. Eg Araldite types.
Any repair is going to risk future failure on cast iron I am afraid.
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MikeRJ
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| posted on 12/1/11 at 03:02 PM |
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I've successfully MIG'd a couple of cast iron exhaust manifolds with normal mild steel wire, by heating the whole thing in the oven (wife
got a bit upset!) then getting the area around joint as hot as I could with a blow lamp prior to welding and kept playing the blow lamp over the joint
afterwards to let it cool as slowly as possible. Both manifolds are in daily use 3-4 years later with no leaks. Not sure this would be possible if
good dimensional accuracy is needed on the welded part though.
[Edited on 12/1/11 by MikeRJ]
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Bluemoon
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| posted on 12/1/11 at 03:28 PM |
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Photos might help.. what part have you broken? Simple repair might be possible not tried it but epoxy and some "fish plates" (i.e .bolted
re-enforcement plates might help? depends where the break is..
Dan
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David Jenkins
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| posted on 12/1/11 at 03:53 PM |
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quote:
Originally posted by Bluemoon
Photos might help.. what part have you broken? Simple repair might be possible not tried it but epoxy and some "fish plates" (i.e .bolted
re-enforcement plates might help? depends where the break is..
Dan
Or steel dowels through the piece?
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