×
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

EB welding of 4145H to 4330V

EB welding of 4145H to 4330V

EB welding of 4145H to 4330V

(OP)
I have a challenge to EB weld 4145H to 4130V. The final product must meet ASME 9. The EB weld is .688 deep and has a step joint configuration. I am trying to avoid hot tears after welding. What type of pre and post heating would be best to prevent hot tears if any? Any other ideas would be appreciated. Thanks  

RE: EB welding of 4145H to 4330V

Kulungi;
For this type of joint design and weld thickness, you will need to preheat at 400 deg F minimum. For post weld heat treatment temperature, you need to determine what the original heat treatment is for the 4145 and 4130V steels. Review the original material mill test report to determine the tempering temperature and post weld heat treat 50 deg F below this temperature.

For production welds, after Section IX procedure qualification, I would recommend you specify nondestructive testing - surface and volumetric – if this is a critical load carrying weld.
 

RE: EB welding of 4145H to 4330V

(OP)
They are critical load carrying welds. I was planning to try preheating using a defocused beam using thermal couples in various locations on the samples. If I try to heat them in an oven I will lose most of the heat getting into the chamber and pumping down. I plan to weld using a narrow beam is that better then a wide beam? I figure the less heat and melting of base material might help stop hot tears from forming. Is cooling the issue when the material cools fast the hot tears form or does this matter? Thanks for any information you can supply.

RE: EB welding of 4145H to 4330V

For your application, preheat is required to reduce the cooling rate and avoid harmful formation of martensite, which is a structure that forms upon rapid cooling of the heat affected zone of most low alloy steel base metals. Also, sufficient preheat will reduce thermal stresses, which can contribute to crack initiation and propagation during and after welding.

RE: EB welding of 4145H to 4330V

A narrow beam is not always best.  If the joint is deep with respect to the beam/joint width, then the small volume of metal that is liquified and solidified will be stressed highly due to the high contraction caused be thermal conduction into the surrounding parts.

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