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

Aluminum HAZ Strength 4043 vs 5356

Aluminum HAZ Strength 4043 vs 5356

Aluminum HAZ Strength 4043 vs 5356

I am hoping that someone can explain to me the strength values for heat affected zone presented in the Aluminum Design Manual Table A3.3 for 6061-T6. The ultimate tensile strength for 6061-T6 is 42ksi for non-HAZ and 24ksi for HAZ. That part makes sense. However, when looking at the yield strength, non-HAZ is 35ksi but the yield strength in the HAZ varies depending on the filler. Yield strength in HAZ is 11ksi if welded with 4043 and 15ksi if welded with 5356 (assuming for the moment t > .375). Why does the filler type affect the strength in the HAZ? The heat input seems to be relatively the same for the two filler types, so I can't figure out why the yield strength of the HAZ would vary due to filler.

Any insight would be very much appreciated.

Tom W

RE: Aluminum HAZ Strength 4043 vs 5356

Interesting question.
As you say, I do not think the filler should effect the HAZ, but I'm no metallurgist.

From a structural engineering point of view, here's my $0.02:
I am used to working according to eurocodes, there you will find HAZ reduction factors depending on:
-the base material (with differentiation between precipitation hardening and strain hardening alloys, and wrought and cast material)
-the thickness
-the welding process (GTAW or semi-automatic welding (= process 131 - MIG))

but the mechanical properties of the HAZ are nowhere linked to the used filler metal (the different filler metals are however tabulated, so they are considered for other aspects).

RE: Aluminum HAZ Strength 4043 vs 5356

The aluminum welding standards I have worked with specify the "as welded strength" regardless of the filler metal used. There is no mixing of the filler metal and base metal in the HAZ. The HAZ adjacent to the weld is base metal that has experienced temperature sufficiently high to undergo metallurgical changes. In the case of heat treatable aluminum alloys the HAZ can be overaged allowing alloying elements to precipitate along the grain boundaries thereby reducing the base metal strength. In the case of nonheat treatable aluminum alloys, the HAZ is most likely softened, again reducing the strength gained by strain hardening.

During tensile testing, aluminum alloys typically fail in the HAZ provided there are no defects in the weld.

Best regards - Al

RE: Aluminum HAZ Strength 4043 vs 5356

Metallurgically, the 4043 is a softer material than 5356 and has a lower tensile strength. In the HAZ there is solutioning that occurs thus the strength of the 6061-T6 material is diluted by the temper reduction from welding as well as the lower strength of the 4043 filler material.

RE: Aluminum HAZ Strength 4043 vs 5356

good article, dvd...thx

RE: Aluminum HAZ Strength 4043 vs 5356

Thanks everyone for taking time to share your insights and thanks dvd for the article. I'll definitely keep that on file.


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