×
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

Tear of Head weld

Tear of Head weld

Tear of Head weld

(OP)
Dear experts,
The issue is about tearing along long seam weld of SS (304L) head.this head is formed from 3 segments.along with forming action the L.W's were torn to a length of about 20 mm exactly at the place of weld seam.Fortunately the base metal is sound. What I want to know is the needed test after repair of weld such as ferrite checking and hardness(criteria) and NDT ? could you please help me?

RE: Tear of Head weld

How was it torn?
Is this PV head in operation, or ebing built?

Why do you think you can save the PV head by re-welding at a previously and badly distorted head seam at the failed weld, instead of replacing the head? Or cutting out the failed area completely, and using new material?

RE: Tear of Head weld

If the long seam weld ruptured during final forming of the head, you have introduced a significant amount of cold work into the head material and long seam welds. You will most likely require the head material and remaining long seam welds to be re-solution annealed after removing the ruptured long seam weld metal. The first step is to remove the damaged long seam weld metal by grinding and ensure the remaining weld metal is not cracked. Ensure complete removal of the cracked weld metal using Liquid Penetrant testing (LPT). You may want to consider removing all of the original long seam weld metal in the head segments that were cold formed and start over.

Once all of the ruptured weld metal has been removed, and verify as being removed using LPT, you will need to re-solution anneal the head material to remove the affects of cold working. Once this is completed re-weld the long seams. Perform final LPT on the welds.

RE: Tear of Head weld

Can you share some pictures of the tear ?

MJCronin
Sr. Process Engineer

RE: Tear of Head weld

(OP)
For sure Mr. MJCronin

RE: Tear of Head weld

(OP)
Dear Mr. Metengr if we gouge the weld and then perform PT and then reweld it, would it be enough? why would you offer solution annealing?
If the rupture happens due to poor quality of weld such as brittleness or hot cracking of weld isn't it enough to just reweld and do NDE?

RE: Tear of Head weld

ahmadire
The re-solution anneal would only be necessary if a significant amount of cold work had been introduced during forming to rupture an acceptable quality long seam weld.

If the weld was defective as you believe and is possible, removal of the entire weld could be done with no re-solution anneal to the base material. You will need to proceed with caution on re-use and you need to make this call because this is a nonconformance.

RE: Tear of Head weld

This appears to have resulted from a major manufacturing error. Re solution treating is warranted to save the head.

RE: Tear of Head weld

It looks like the weld was not properly dressed on the edge of the plate before flanging. This stress riser most likely propagated the crack. Did this weld require radiography? See the partial data report if it is an ASME Code head. If so in addition to LPT the repair should also be fully radiographed.

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