Contact US

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!

*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 4140 to st 37

welding 4140 to st 37

welding 4140 to st 37


I need info about welding (corner weld 2 passes) st 37 on a 4140 shaft. Can this be welded with 16%Cr and 65 % Ni electrode ?

RE: welding 4140 to st 37

Don't know what st37 is, but you should give a lot of consideration to the HAZ of the 4140, which will probably be quite hard and brittle if you don't use enough preheat.  Post weld HT is better.

RE: welding 4140 to st 37

Are you referring to ENiCrFe2 type of electrode? I.e. Inco-Weld A from |Special Metals for e.g. Refer this link for details http://www.specialmetalswelding.com/products/incoweld/incoweldwea.htm
Yes, this consumable can be used for the application detailed. Refer to Metalguy's words of caution though.
for St37 refer following posts:
Thread330-62886 refersa to St37 which is equivalent of S235
Thread330-56039 refers to USt37-2 which is equivalent of A283
Finally see the last post in Thread330-17608 which explains what St37 stands for!!!

Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
The whole of science is nothing more than a refinement of everyday thinking!!!  

RE: welding 4140 to st 37


Thanks for reply
Shaft will be preheated at 250degree C(482 degree F) . After welding, the shaft will be "insulated" during some time, so cooling will be slowly.

St 37 Analyse : %C <=0.17
                %Si <= 0.55
                %Mn <=1.60
                %P <=0.04
                %S <=0.04

RE: welding 4140 to st 37

Your intended preheat is pretty good, but I'd go even higher.  What you want to do is avoid cooling thru the range of ~1,300 to 1,000 deg F too fast.  This will allow time for the austenite in the HAZ to transform to pearlite.

I did a little study with a low alloy steel (P3) welded with the worst case-a single pass.  Preheating to 400 deg. F. wasn't high enough, but we never did go back and try higher temps.

RE: welding 4140 to st 37

Must you use that much Cr in a weld joint?

RE: welding 4140 to st 37


This is a proposal from manufacturer

RE: welding 4140 to st 37

If your stuck with it, I would use a high preheat and a slow-cool down. But it's too Cr-rich for my tastes.

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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