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Is it allowed to weld together different kinds of iron?

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oriol

Well-Known Member
Joined
Dec 31, 2009
Messages
1,473
Location
Barcelona, Spain.
Hi all!


I understand that to avoid corrosion it is important to avoid as possible the contact between dissimilar metals.

I´m considering to weld together two different kinds of iron:
"Ducal" also known as ST 52 wich is very resistant and somehow difficult to obtain, the tubes are´nt joined by welding etc, and iron S 235 wich is very standard and easy to obtain.

Although both irons have different qualities/mechanical properties both contain a low percentage of carbon under 0,25%. The dealer says they can be weld together without concern.


Is that right? Where is the limit when welding too different metals together?

Maybe they can be weld together without causing corrosion but will it result in a weak welding joint?


The work I´m going to perform is not for an aeronautic structure now, but It would be interesting to try something like that for aerial purposes in the future.



Thank you very much for your comments!


Oriol


-)
Maybe I´m complicating things by thinking too much, for example when you perform arc welding the consumable electrode acts as a filling material and gets mixed with the metal changing a bit the chemical composition in the welding joint without causing any trouble. The chemical composition of the structure is not 100 % homogeneous but it can hold the loads fine.
 
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