×
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 mis-drilled holes

welding mis-drilled holes

welding mis-drilled holes

(OP)
What are the dangers of welding mis-drilled holes in structural steel and then re-drilling them as long as the welds meets AWS spec?

RE: welding mis-drilled holes

Plug welding misplaced holes in structural members is common as long as the repair procedure is in conformance with AWS D1.1:2002, 5.26.5 and the procedure has been approved by the RDP.

RE: welding mis-drilled holes

(OP)
So re-drilling the welded holes for use as connection holes is common? The welded area is as structurally sound as before?

RE: welding mis-drilled holes

The weld material is stronger than the original base material.

If this connection is subject to stress reversal (fatigue) then you're better off scraping the piece and starting anew.

RE: welding mis-drilled holes

(OP)
What exactly could happen in a bolted connection with these holes?

RE: welding mis-drilled holes

There's quite an a lot of weld metal to be deposited in the hole which will generate a lot of heat. Unless the weld spec is specifically for this case and the weld is carried out slowly the heat could change the properties of the steel. Depends on the type of steel etc, all these details are covered by the weld spec.

Zambo

RE: welding mis-drilled holes

I agree with Qshake. In the whole of the affected zone undertainties will have been generated that wouldn't be standing in a piece perforated anew. The deposited weld steel likely is stronger than the original, but the base steel is affected in the HAZ zone and its properties may have been downgraded in ways that make the ordinary provisions for checks under both statical forces and fatigue might not be applicable, there not being maybe standing others for the case when the steel has so been affected.

The cost of fabrication of the pieces may advice to make other kind of modification than scrapping them.

Substituting some area of plate or plates also will cause HAZ zones to be present, but you may bring the weld zones to less critical places for which the success in the repair is easier to warrant even by specifications, and so you may avoid to use the critical placements such altered holes for bolts.

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