×
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

Carbon Steel Padeyes welding to Stainless Steel Frame

Carbon Steel Padeyes welding to Stainless Steel Frame

Carbon Steel Padeyes welding to Stainless Steel Frame

(OP)
Dear Community Members,

Can a carbon steel padeye (Fy = 250 MPa/345 MPa) be welded to a Stainless Steel Frame (SS316) to facilitate lift operation? Are there any restrictions that will render the payeye not fit for reuse should the frame need to be replaced at the end of service life?

Thanks and Regards

RE: Carbon Steel Padeyes welding to Stainless Steel Frame

StructuralNomad:
If the frame has to be stainless steel, shouldn’t the padeyes which might need to be used years later also be stainless steel, for all the same reasons as the frames. The two materials can be welded together, but you degrade some of the characteristics of the SS in the process. You could also make the padeye up from a SS middle pl, with two carbon steel side/cheek pls. to get the full width. This gets the carbon steel welding away from the frame or vessel.

RE: Carbon Steel Padeyes welding to Stainless Steel Frame

Hi

Does it have to be a welded lifting lug? Could you bolt or screw a lifting device on, which may be removed after installing,mas an alternative to what dhengr has suggested.

RE: Carbon Steel Padeyes welding to Stainless Steel Frame

(OP)
dhengr, desertfox,

Thanks for your replies. My first thought was to recommend Stainless steel padeyes as the frames were made of the same material. A proposal was put forward by the Contractor to weld Client supplied standardised padeyes with CS material.

Bolted connections are not allowed as per Client specifications.

Thanks and Regards

RE: Carbon Steel Padeyes welding to Stainless Steel Frame

It is possible, but it is not the best solution. The extra care necessary will likely cost more than the added expense of SS padeyes. What quantity are you talking?
I second dhengr's remarks. What if the padeyes are rusted away when you need them?

RE: Carbon Steel Padeyes welding to Stainless Steel Frame

I'd use stainless steel padeyes and passivate the welds with a nitric acid wash. The problems with the coating and welding of the mild steel will be a long term issue and if the environment is such that stainless is required...

Desertfox's idea of using a bolted connection has merit... and the padeye can actually be detached and stored away to be 'lost' <G>.

Dik

RE: Carbon Steel Padeyes welding to Stainless Steel Frame

(OP)
Thanks everyone for your valuable input.

Best Regards,

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