BenB
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| posted on 4/12/11 at 05:48 PM |
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welding cast iron
Is welding pig iron well.... a pig?
I'm not suggesting I try MIGing it (despite the info on MIGwelding.co.uk I don't fancy it much). But is it possible to do it? IE if I take
my broken fireplace hearth to a pro welder (of which I no doubt there are loads in North West London  ) are they just going to suck their teeth? Am
I right thinking oxy-acetylene is the way forward?
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PSpirine
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| posted on 4/12/11 at 05:57 PM |
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You can stick-weld it pretty well. There are special rods you can buy for it (forget the name). They're not particularly expensive - about the
same as any other rods IIRC.
The trick to welding it is if possible, heat the whole thing up in an oven as hot as possible (slowly), then weld, and let it cool down slowly.
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Peteff
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| posted on 4/12/11 at 05:59 PM |
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quote:
Originally posted by BenB
Am I right thinking oxy-acetylene is the way forward?
No, you might braze it with oxy-acetylene but I don't think you'll weld it. I think the only plausible way is stick welding with high
Nickel rods with lots of pre heat and a long cool down period.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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madteg
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| posted on 4/12/11 at 06:13 PM |
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Pre heat stick weld with high content nickel rods and let cool.
If you need some rods let me know as i have some left over from a job and you find them very expensive.
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zilspeed
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| posted on 4/12/11 at 06:25 PM |
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I once had a mild steel elbow 1.5mm thick welded onto a cast iron exhaust manifold. He used stick to weld it, gas torch to heat the work, what he
called "dissimmilar rods" and a deft touch. Welding mostly onto the cast, dipping slightly onto the mild steel bit.
A proper blacksmith will be able to do this job for you, just like the one I used.
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trextr7monkey
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| posted on 4/12/11 at 06:45 PM |
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I had some steering arms welded up as somone had cut the ends of the eyes off and MOT man wasn't happy, local engineering shop did them as
above, £20 cash
http://www.flickr.com/photos/14016102@N00/ (cut and paste this dodgey link)
Our most recent pics are here:
http://s129.photobucket.com/albums/p211/trextr7monkey/
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steve m
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| posted on 4/12/11 at 07:47 PM |
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I managed to weld up a rather split VW golf exhaust manifold with an Arc welder, a good few years ago,
I cut a deep v into the gap, and just kept going back an forth with the arc rods, untill the v was filled
wasnt a pretty job, but the car passed a couple of MOT's with the repair
Steve
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Wheels244
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| posted on 4/12/11 at 07:56 PM |
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quote:
Originally posted by madteg
Pre heat stick weld with high content nickel rods and let cool.
If you need some rods let me know as i have some left over from a job and you find them very expensive.
+1
I like welding cast iron, bit of a challenge to prevent cracking
but get a lovely weld with the high nickel (dissimilar ) rods.
Plenty of preheat with a propane torch and don't try to do long runs at once.
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austin man
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| posted on 4/12/11 at 08:25 PM |
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I welded a cast manifold to a steel backplate, has done around 2k without problems I did pre heat the manifold prior to welding and would recommend
using stick the Mig didn't seem to want to get the steel hot enough. The stick really created a pool of weld
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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BenB
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| posted on 4/12/11 at 08:33 PM |
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Hmmmmmm. stick welding. Never done that!
Okay, at least I know what to ask the local welders when I find them  thanks for the info!
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fazerruss
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| posted on 4/12/11 at 08:43 PM |
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Ive welded numerous bits of cast iron with mig p1ss easy. eg a cast collar on my pillar drill, drum ring gear on cement mixer.
"if assholes could fly this place would be an airport"
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snapper
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| posted on 4/12/11 at 08:46 PM |
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As I understand it to Dow structural weld you need to heat the cast metal very hot.
For just joining cast good braze will do
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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The Black Flash
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| posted on 4/12/11 at 08:50 PM |
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I Mig'd a cast bushing on my old lathe. Stuck it in the fire until it was red hot, ran through the house and out into the garage with it  ,
and welded it up. Still fine a couple of years later. I'd want to get a professional in for anything critical, but for odd bits, doesn't
see too bad.
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MikeRJ
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| posted on 4/12/11 at 08:52 PM |
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quote:
Originally posted by trextr7monkey
I had some steering arms welded up as somone had cut the ends of the eyes off and MOT man wasn't happy, local engineering shop did them as
above, £20 cash
Steering arms will be forged steel, not cast iron.
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