Aluminium welding failure from parent metal

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kadir...@gmail.com

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Sep 15, 2019, 9:01:17 AM9/15/19
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Dear experts,
EN AW 5754 H22 welded with ER5356, RT clear but gets failed in tensile.
What can be the reason please guide..
The artilce wleded is a 3 mm thick plate to plate butt joint.
Required YS 0.2 - 130 MPa
I am getting only 103 and 99 MPa.

Required UTS - 220-270 MPa
I am getting - 213 & 205 Mpa

Regards
Kadir godil

ViNo Varughese

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Sep 15, 2019, 11:14:39 AM9/15/19
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Dear Kadir,

Can you please provide more information on the methodology tensile test was performed? Also refer to attach guideline which might be useful.

Thanks and Regards
Vino 
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Maxal_Guide_for_Aluminum_Wldg.pdf

Ramin Kondori

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Sep 16, 2019, 3:26:07 AM9/16/19
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Normally, the specifications specify lower tensile strength levels for weld qualification test for these Aluminum grades (comparing to the original tensile strength of the parent metal); it is due to the softening effect of welding on Aluminum. 5754 plates are Al-Mg3 grades with subsequent work hardening and some tempering (quarter hard) and their welds (or HAZ) is weaker than the unaffected plate; it is normal. 

Having said that, I believe that with these results, you might be in the acceptable range. I recommend you to check your specification and confirm this point before proceeding. 
 
Ramin  Kondori
Sr. QA/QC & Welding Engineer
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Kadir godil

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Sep 16, 2019, 3:26:07 AM9/16/19
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Thanks for you reply. 
Kindly check the attached photos.

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Lu, Feng

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Sep 16, 2019, 11:18:18 PM9/16/19
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I agree with Ramin’s comment below.  Also from the attached test results you provided, the failure is in base metal. 

 

I suggest you to do a tensile test just with the base metal.  If the base metal comes lower in strength, it is not going to get improved by welding.

 

 

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Feng Lu, Ph.D., NDE Level III
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Kadir godil

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Sep 17, 2019, 7:36:34 AM9/17/19
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Thank you all experts for you valuable feedback.

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