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Posted by Jet Fitter on October 17, 2008, 8:25 am
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Anyone on here ever tried mig welding cast iron using stainless wire
and pure argon gas?
Had a search on Google and some say it can be done with good results
but others say you are just waisting your time. The tips that i have
picked up so far say to weld about an inch at a time and then peen the
weld with a ball pain hammer before it cools.
Any other hints or tips?
Thanks Paul.
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Posted by Guy Fawkes on October 17, 2008, 3:03 pm
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> Anyone on here ever tried mig welding cast iron using stainless wire
> and pure argon gas?
> Had a search on Google and some say it can be done with good results
> but others say you are just waisting your time. The tips that i have
> picked up so far say to weld about an inch at a time and then peen the
> weld with a ball pain hammer before it cools.
> Any other hints or tips?
> Thanks Paul.
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Posted by Guy Fawkes on October 17, 2008, 3:10 pm
Please log in for more thread options > Anyone on here ever tried mig welding cast iron using stainless wire
> and pure argon gas?
> Had a search on Google and some say it can be done with good results
> but others say you are just waisting your time. The tips that i have
> picked up so far say to weld about an inch at a time and then peen the
> weld with a ball pain hammer before it cools.
> Any other hints or tips?
> Thanks Paul.
I've used mild steel wire and argoshield with excellent results, plus
it means many repairs can be done in situ.
What worked for me was...
1/ grind out vee
2/ weld in stitches no more than 2cm long and at least that far apart
3/ use the lowest current / feed setting
4/ pause between stitches
the idea, contrary to traditional methods with stubs high nickel rods,
is to ensure the cast iron never gets hot, so you never get carbon
migration and austentic / martensic (sp?) problems.
Weld it like steel and even if it doesn't crack on cooling it will
dull a file it will be so hard.
NB I would NOT advocate this on anything other than baths, engine
block water jackets, manifolds etc, eg stuff not subject to stress.
I know of NO WAY to satisfactorily weld a cast iron flywheel for
example.
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Posted by Mark Rand on October 17, 2008, 5:37 pm
Please log in for more thread options wrote:
>
>I've used mild steel wire and argoshield with excellent results, plus
>it means many repairs can be done in situ.
>
>What worked for me was...
>
>1/ grind out vee
>2/ weld in stitches no more than 2cm long and at least that far apart
>3/ use the lowest current / feed setting
>4/ pause between stitches
>
>the idea, contrary to traditional methods with stubs high nickel rods,
>is to ensure the cast iron never gets hot, so you never get carbon
>migration and austentic / martensic (sp?) problems.
>
>Weld it like steel and even if it doesn't crack on cooling it will
>dull a file it will be so hard.
>
>NB I would NOT advocate this on anything other than baths, engine
>block water jackets, manifolds etc, eg stuff not subject to stress.
>
>I know of NO WAY to satisfactorily weld a cast iron flywheel for
>example.
You will still get iron carbide formation in the HAZ. It may not be an issue,
depending on the use. I've migged up an Escort exhaust manifold well enough to
stop it leaking and taken the scars out of a drill table. The first was left
as-is, the second needed surface grinding. If the weld needs tidying up
afterwards, then use a grinder. I'll save the cutting tools.
Forget about peening the weld. With a low current MiG weld, you'd have to be
hitting it within milliseconds of the weld going on to have any effect, it
cools so fast.
Nickel rods do give a nice result, but they're not much good if all you've got
is MIG :-(
Mark Rand
RTFM
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Posted by Jet Fitter on October 19, 2008, 3:31 pm
Please log in for more thread options Thanks for the replys guys, had a bit of a play today but
unfortunately with very little success, so guess i will have to find
somebody amongst my mates who can arc weld or braze it for me for a
few beer tokens.
Paul.
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> and pure argon gas?
> Had a search on Google and some say it can be done with good results
> but others say you are just waisting your time. The tips that i have
> picked up so far say to weld about an inch at a time and then peen the
> weld with a ball pain hammer before it cools.
> Any other hints or tips?
> Thanks Paul.