Numerical simulation of welding 1

[brad]

I am looking for information on simulating welds (specifically arc line welds, but any information is good) using finite element analysis.

I am interested in modeling the resulting stresses and distortions in sheet material assemblies. I don't care about the details of the weld itself (beyond what is necessary to capture the physics), but am more concerned with the effects of the process.

Are there any specific areas which somebody could recommend I search. I understand the basics of welding, but I am an FEA analyst by profession. If somebody could recommend some welding publications which may address this, or some research groups at universities, etc. I would be appreciative.

If somebody knows of journals, websites, etc. please let me know.
Thank you,
Brad

 

[vonlueke]

Don't know if either of these contain useful general analysis info., as I've not yet read them, but you might want to scan briefly to see if any pages look promising.

http://www.louisville.edu/~s0zhan03/

http://www.mscsoftware.com/support/library/conf/auto00/p06300.pdf

 

[brad]

vonlueke,
Thanks for the links. However, I am interesting in nonlinear aspects of the distortion of the joined metals (as opposed to details of the modeling of the weld itself).
I appreciate the post. If you know of any others, please let me know.

Thank you,
Brad

 

[vonlueke]

Perhaps try these links pertaining to SYSWELD weld simulation.

http://www.esi-group.com/products/sysweld/publications.html

(1.7 MB).

http://www.esi-group.com/products/sysweld/SWpc2000.pdf

(2.3 MB).

http://www.esi-group.com/news/success/sysweld/success_story_sysweld.pdf

(0.74 MB).

 

[Irwin]

Try to see the

http://www.femfat.com

site! This is a fatigue calculation software, but they use Radaj method for analysing the weld seams! Originaly it is solved by BEM, but the main ideas is also correct for FEM!

Irwin

 

[welding1]

Try

http://www.twi.co.uk

You will need to understand distortion, which is a complex mechanism. The problem is that it occurs in three dimensions as a result of residual stresses caused by contraction forces, these stresses can be up to yield point in level. They are influenced by the speed of welding, heat input and weld metal deposition rate.

The above web site gives lots of information on how to control distortion which might be a good place to start.

John

http://www.gowelding.com

 

[brad]

Welding1:
What you are describing is what I am looking for--in fact I am looking for material relevant to this very phenomenon. Sadly, I am not able to access these sites which you gave--are you sure that the url given is correct?
Thanks,
Brad

 

[vonlueke]

Brad: Perhaps try "Development of a comprehensive weld process model," 1997,

http://techreports.larc.nasa.gov/nt...ex/star/update%157742 3002 N19980002506recon1

.
E-mail your librarian to have her obtain and e-mail an electronic copy if it looks promising. Good luck.

 

The request by bradh as a FEA Analyst is rather interesting and should be a lesson in the value of contributions from a number of engineering disciplines to the solution of complex engineering problems. The real facts are that an FEA model is worthless unless it is statisticaly validated by performing a large number of controlled welds. Furthermore the stresses and distortions for various welds are a function of the specific material (as well as heat treat condition), the welding process, the heat input (current, voltage and travel speed), the preheat and interpass temperatures, the level of restraintas well as several minor variables. In my 37 years of metallurgy and welding experience, I have found that with proper selection of the many variables and with luck some reasonable control is possible. Good luck with the model. BOB

 

[brad]

Vonlueke--the NASA report is right on track. Unfortunately, I'm not a student so I'll probably have to bite the bullet and buy it.

Bob,
I am in agreement with your points. I have found some useful literature, and it is clear to me that merely capturing the effects of all of the cross-functional disciplines involved is a chore in itself. Actually quantifying appropriate variables is a whole other beast.

I can't begin to correlate to tests until I have a reasonable understanding of how to model this from a mechanics standpoint. I think it is noteworthy (and frankly more useful) that there are many more "weld" people posting on my query than there are FEA people (I cross-posted this question).

This looks to be an area for future mechanics development.

Thanks for your recommendations, and keep them coming if anybody has more.
Best regards,
Brad

 

[welding1]

Sorry, the URLs are correct but for some strange reason a blank space exists at the end of each address.

 

Hi

I'm seeking data for the temperature depending specific heat and conduction for my welding simulations.

Is there any databases available online?

Best regards
Chris

 

Hi

I'm seeking data for the temperature depending specific heat and conduction for my welding simulations.

Is there any databases available online?

Best regards
Chris