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Welding CS to SS Materials

Welding CS to SS Materials

Welding CS to SS Materials

(OP)
Hi friends,

Can any body help me about that if joining carbon steel to stainless steel material is acceptable as per code SECTION 8 and B31.3 or not?

If yes or no which part of the code can I find the evidence.

Thank you very much for your guide.

RE: Welding CS to SS Materials

We have welded SS to CS many times. You need a qualified WPS to do this.

RE: Welding CS to SS Materials

(OP)
Previously I heard connection between this two types of materials may cause corrosion And because of that we have to use some nonmetallic part between if needed. It wasn’t right?

RE: Welding CS to SS Materials

We weld these materials together all the time, no problem.

RE: Welding CS to SS Materials

Connecting dissimilar metals can result in galvanic corrosion issues, but you have join them somehow. You need to evaluate the risks.
This is common even in corrosion sensitive environments, however these welds need to to be protected.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Welding CS to SS Materials

Proper selection of filler metal is necessary for dissimilar metal welds in certain applications. Good engineering practice reduces the need for DMW's in service.

RE: Welding CS to SS Materials

I would avoid any dissimilar metal welds in a corrosive service where the less corrosion resistant material (carbon steel in this case) is already a marginal selection. If it is a noncorrosive service and the only corrosion you're worried about is external, it's not a big problem.

As far as the mechanical integrity of such welds, if the weld procedure and filler metal are selected properly and all the other requirements of ASME IX as well as any additional local requirements you may have, you are good to go..

RE: Welding CS to SS Materials

Mechanical joints (i.e. flanged connection) should also be considered by the designer as a alternative.

It should also be noted that, at welded piping joints where CS joins SS there is a stress concentration whenever there is a thermal transient event.

The expansion coefficient for these materials is significantly different.

MJCronin
Sr. Process Engineer

RE: Welding CS to SS Materials

ASME VIII and B31.3 do not limit joining of dissimilar metals. It is done quite often based on engineering service requirements.

RE: Welding CS to SS Materials

(OP)
Thank you guys :)

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