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

Dissimilar Welding

Dissimilar Welding

Dissimilar Welding

I have to weld a T-joint in full penetration with dissimilar thicknesses in Asme IX. Both materials are in carbon steel (P-N.1.2) the only QW that speaks of dissimilar thicknesses is QW-202.4.
Base material 1 thickness 8mm
Base material 2 thickness 35mm
the QW-202.4 for the CS refers to the QW-451.1 for this case.

how do i prepare the two flaps for the qualification? should i follow ASME VIII-1 Figure UW-9? I tried to design the qualifying heels but I don't like it. I should taper the thickness difference to 96mm! it seems to me too much to qualify.
do you have any advice?
thank you!

RE: Dissimilar Welding

Why not just weld a coupon with two plates of 35mm/2 minimum thickness? That would qualify for 5mm - 2x the thickness used.
Example: Weld a coupon with P#1 - 3/4" (19mm) Plates. Will qualify 5mm - 38mm. Both your thicknesses are within this range, so QW-202.4 is satisfied. Then taper as per construction Code in production.

Note: You say Base material 2 thickness is 35mm, but sketch shows 40mm.

RE: Dissimilar Welding

thanks for the reply, I did not specify that I am in the QW-403.6 impact test regime (The minimum base metal thickness qualified
is the thickness of the test coupon T or 5/8 in.)(16 mm),. Actually I wanted to qualify higher thicknesses, and the QW 202.4 says that with MB greater than 38mm the thickness is unlimited.
for this reason I put 40mm. the drawing you see is the Cupon that qualifies.

RE: Dissimilar Welding

How about doing a coupon with the plate at 1-1/2", test it with no impacts. This will qualify 5mm - 200mm Base metal. Then do a coupon with the 8mm plate and do only impacts...all other variables the same as the first coupon. QW-403.6 only limits the min. thickness. Combine these two PQRs into one WPS with 8mm - 200mm qualified thickness with impacts.

RE: Dissimilar Welding

I've always found it to be one of the more confusing rules in Section IX.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Dissimilar Welding

Test coupon for qualification of T-joint between 8mm and 35mm is the same as 8mm and 400mm.


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