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

Welding CS to Cs with ER80S-D2

Welding CS to Cs with ER80S-D2

Welding CS to Cs with ER80S-D2

Ive been tasked with reviewing a boiler repair performed several years ago by a well established vendor.

Replacing several boiler tubes in several different boiler sections. Header/tube material garden variety 10" sch 120 SA 106 B/ 2" 120mw SA 178A. Nothing special about this configuration.

For the tube to header welds, I would have expected to see a GTAW procedure using ER70S-2 and maybe an additional/combination SMAW procedure using 7018

In this case, all the root welding was done with ER80S-D2/7018 Nothing particularly wrong with it...just havent seen it done before.

Why choose the ER80S-D2 over ER70S-2? It would seem the Moly addition would decrease weldability in an allready limited access configuration (and bring weld preheat into the job)

RE: Welding CS to Cs with ER80S-D2

ER80S-D2 would provide additional high temp strength in the weld metal above 650F, but at a cost of some temper embrittlment above 750F. We would have used ER70S-6 for this application in lieu of ER70S-2. Many Contractors/Suppliers use ER80S-D2 in lieu of the simple C-1/2 Mo filler because of it being more readily available.

RE: Welding CS to Cs with ER80S-D2

I agree with what weldstan has posted above, and I'd also like to add that the small addition of Mo does not decrease weldability, nor does it add the requirement to preheat. Preheat is recommended, but not required. If the WPS was qualified with preheat, then of course it is mandatory.

Have a read of SFA-5.28, Annex A, A7.11 for a pretty good description of this electrode.

The devil is in the details; she also wears prada.

RE: Welding CS to Cs with ER80S-D2

Ditto to both answers.
ER80S-D2 is perfectly suitable for the task, with no decrease in weldability. You could even safely weld over existing D2 deposits with ER70S-X carbon steel filler.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Welding CS to Cs with ER80S-D2

Thanks guys...

RE: Welding CS to Cs with ER80S-D2

Do they have a qualified WPS? Without looking, I suspect the -D2 might affect the A number if the original WPS was qualified using an E70S-X filler metal.


Best regards - Al

RE: Welding CS to Cs with ER80S-D2

I don't recommend that, I'm just saying it would be technically doable. There are obvious complications for a WPS in mixing classifications and A-numbers.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

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! Already a Member? Login


White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. Download Now
White Paper - The Other Side of Design for Assembly
Assembly level constraints need to be satisfied before the design can move downstream. This white paper will go through the various assembly level issues, which need to be tackled by various organizations on a regular basis. Know more about DFMPro, a design for assembly software. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close