×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

316 SS pipe welding to carbon steel

316 SS pipe welding to carbon steel

316 SS pipe welding to carbon steel

(OP)
I read over the thread realted to isolation flanges, but I figured it would be better to start a new thread...

Is it OK/common practice to weld 316L SS pipe to standard sch 40 carbon steel pipe or A36 steel plate?  Are there any type of special welding materials/electrodes or special prep procedures that I should call out on the drawings/in specs?

Also, is there a dielectric issue with these dissimilar metals?  I don't have water in the system.  The application is more of a stack instrument test port nozzle.

And finally, if flanging/gasketing is employed, doesn't the gasket serve to dielectrically separate the two materials or do I need something else since the bolting bridges the materials?

Thanks in advance.

RE: 316 SS pipe welding to carbon steel

Olaf,

Suggest that you repost in a Welding forum

Yes, carbon steel can be welded to stainless. Tank fabricators do this virtually every day when the weld CS legs to SS tanks.

-MJC

  

RE: 316 SS pipe welding to carbon steel

Even if you had water, there isn't enough of a potential difference between CS & SS to worry about galvanic corrosion.  316L is preferred over 316 with 316L welding rods.  It is commonly done as MJC suggests.   

RE: 316 SS pipe welding to carbon steel

(OP)
Thanks guys for the responses.

FYI, I "re-posted" over at the "steel and stainless engineering" forum too.  There did seem to be a little more interest/expertise over there.

RE: 316 SS pipe welding to carbon steel

CountOlaf,

 Common practice for welding dissimliar metal like SST to Carbon would be to use filler material identified as 309. It come as a electrode for stick welding or slick wire for Heliarc. I'm a pipefitter by trade and I used it all the time for simple welds! All the way up to X-Ray joints. Hope this helped.

RE: 316 SS pipe welding to carbon steel

CountOlaf,
Yes there is a major galvanic mismatch between 316 SS and carbon steel. Since your dissimilar joint is not in in contact with an electrolyte, you need not be concerned with the flanged joint needing electrical isolation. There are electrical isolation kits that can be provided for bolted flange joints.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources