Welding Carbon steel pipe shoes to stainless steel pipe

[KevinNZ]

We are looking at welding carbon steel pipe shoes to hot insulated 316SS pipe. Are we going to have problems with corrosion because of the dissimilar metals?

thanks

 

[bimr]

Not if you follow the procedures for welding dissimilar metals.

http://www.bssa.org.uk/topics.php?article=101

 

[11echo]

Why weld? Did you think about "clamp on shoes"?

 

[weldstan]

You may have a problem depending on operating conditions; e.g., thermal cycling with large temperature delta, corrosion under insulation due to moisture ingress through leak paths in insulation cladding.

 

[georgeverghese]

This kind of pipe support failure has occured on a project I worked on some years ago - 22Cr duplex SS pipes on CS pipe supports - apparently the fabricator had missed out inserting teflon insulating material between the pipe shoe and the pipe.