×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

AWS CWI - Book of Specification - Minimum Preheat & Interpass Temperature

AWS CWI - Book of Specification - Minimum Preheat & Interpass Temperature

AWS CWI - Book of Specification - Minimum Preheat & Interpass Temperature

(OP)
Hi All experts,

Could you help me with my query pertaining to the finding of minimum preheat & interpass temperature of dissimilar base metal welded together.

By using Appendix XV of Part B - Book of Specifications, under footnote number (d), it states that "In joints involving combinations of base metals, preheat shall be as specified for the higher strength steel being welded."


For Example the two dissimilar base metal are:
ASTM A573 Grade 65 (SMYS=240 MPa; SMTS=450MPa)
ASTM A607 Grade 45 (SMYS=310 MPa; SMTS=410MPa)


From the data in Appendix XIV of Part B - Book of Specifications, should I compare the value of Yield strength (SMYS) or Tensile strength (SMTS) in order to determine the higher strength steel. Then to use the identified higher strength base metal to determine the correct minimum preheat & interpass temperature data for a given thickness from Appendix XV.


Thank you

RE: AWS CWI - Book of Specification - Minimum Preheat & Interpass Temperature

Tensile Strength, because filler metals and materials are selected by this property for AWS Code issues.

In the case above, all things being equal for any given thickness, ASTM A573 Grade 65 has a higher preheat than ASTM A607 Grade 45

As a side note, even though API 1104 classifies materials by yield strength, filler metals are chosen to match the parent material tensile strength.

RE: AWS CWI - Book of Specification - Minimum Preheat & Interpass Temperature

Careful!
The AWS "Part B" Specifications Book is only for the Practical Factors (Part B) of the three-part AWS CWI exams.

It follows, and IS similar to actual specifications manuals, but it is NOT a working welding specification manual. Please, re-check what reference you are reading.

RE: AWS CWI - Book of Specification - Minimum Preheat & Interpass Temperature

If you are studying for the CWI examination, be forewarned the Part B examination is totally new examination (as of January 2016). The Book of Specifications is new, the weld samples are new and very different from the old ones, and there is a new book of exhibits containing WPS, PQRs, and WQTRs that must be used to answer 46 questions.

The new part B examination; well, let's just say I would not want to take it without some time in the classroom to review the new materials.

Best regards - Al

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


Resources

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