×
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

Welding of A-36 and A516 Gr 70

Welding of A-36 and A516 Gr 70

Welding of A-36 and A516 Gr 70

(OP)

As I observed on almost all vessels manufactured in our vicinity on ASME Sec VIII Div. 1, A-36 and A-516 Gr.70 are no welded directly on pressure part. e.g, as for lifting eye (A-36) not welded with shell but a pad is welded with shell. Same is for saddles or some internal baffle plates. What could be the reason? What role does CE (carbon equivalent) have in all this scenario?

RE: Welding of A-36 and A516 Gr 70

Many manufacturers do not keep Mill Test Reports (MTR) for A36 material. Without the material traceability, the material cannot be welded to the pressure boundary. By putting a pad of traceable material and welding to that instead, it is not necessary to trace the material for appurtenances like saddles or lifting lugs.

Carbon equivalent doesn't really play a role unless you consider the traceability to be proof that the material is weldable to ASME Section VIII Div 1.

RE: Welding of A-36 and A516 Gr 70

Lifting lugs and saddles are not considered pressure retaining material or components. Therefore, all you need to do is to prove the material is weldable by Code simply by qualifying a weld procedure.

RE: Welding of A-36 and A516 Gr 70

The items in question may be to distribute load and reduce stresses, not to separate materials.

RE: Welding of A-36 and A516 Gr 70

(OP)
fegenbush can you further elaborate your last sentence

metengr as your respective opinion, A-36 and SA-516 Gr 70 will not qualify a welding procedure as the difference in strengths? and what do you say about the point made by Jstephen?

RE: Welding of A-36 and A516 Gr 70

Both of the materials you list can be welded to the pressure boundary but you need to have an MTR. I specify SA-36 flat bar all the time for vacuum rings and SA-516 Gr70 is an excellent PVQ steel. I use it all the time for pressure boundaries and lifting lugs. SA-36 is typically not used in pressure boundaries but is found in all kinds of structural shapes (flat bar, round bar, plate, etc.) You will run into MDMT issues using SA-36 when thicker since it is a curve A material, it is exempt to -20F up to 1/2" thick.

RE: Welding of A-36 and A516 Gr 70

Quote:

metengr as your respective opinion, A-36 and SA-516 Gr 70 will not qualify a welding procedure as the difference in strengths? and what do you say about the point made by Jstephen?

ukmet - I am not sure about the first statement regarding SA 36 and SA 516, both are considered weldable and belong to the same P-No grouping under Section IX. The second part of your statement, I agree with JStephen.

RE: Welding of A-36 and A516 Gr 70

Nothing is wrong with A36 material plate used as shell or heads it was a good choice in the pass, better materials came along and now A36 is not used as press.part The preferred A516 happens to be near the cost of A36 and with greater advantage.

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