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qaqcpipeman
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Join Date: Sep 2006
Location: Western Pennsylvania, USA
Posts: 761
Good Answers: 9

HSLA Optimum Chemistry

06/21/2011 6:19 PM

Hey gurus,

I am on assignment at a vendor and they are having a high number of repairs on x-ray quality B31.3 welds.

I have eliminated welder error after analyzing all of the reader sheets from Radiography. (no pattern existed and the results for all parameters changed dramatically from day to day.

We are looking at chemistry, wire, machines, and constants of power into building.

I found after using 3 vendors for the pipe, one had chemistry that was very different in some elements than the others. We have passed through that supplier and into another and it seems that as of today the repair rate is less than the last 3 weeks.

Oh, we are finding porosity on the pipe end of the weld, not the fitting side.

My guess is laminations and outgassing causing the porosity, what do you all think?
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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
Posts: 4884
Good Answers: 243
#1

Re: HSLA Optimum Chemistry

06/22/2011 2:09 PM

Please send chem certs to my real email.

Issue is just porosity?

Milo

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 People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
Posts: 4884
Good Answers: 243
#2
In reply to #1

Re: HSLA Optimum Chemistry

06/22/2011 3:49 PM

Not sure if my email got through your spam blocker challenged me here is my answer with out the xl attachemnt:

Carbon equivalents likely to blame here. See my blog: http://pmpaspeakingofprecision.com/2009/12/29/carbon-equivalent-and-weldability/

2 of these were .40.

CE of J****u= 0.405 this steel has grain refiner and probably was not porous despite the high manganese may or may not be fine grained

CE of U*****e=0.2788 this steel has no grain refiners! Coarse grain steel! No manganese to hold hydrogen or other off gas. Probably not as porous and probably welded best due to lowest CE

CE of J****l = 0.40 No microalloys, no grain refiners high CE at .40 worst of three weld wise- high mn, high CE, No Grain refiners shown.


I am puzzled you called these HSLA? Wheres the elements to make that happen?

Hope this helps

Milo

__________________
 People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
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qaqcpipeman
Guru

Join Date: Sep 2006
Location: Western Pennsylvania, USA
Posts: 761
Good Answers: 9
#3
In reply to #2

Re: HSLA Optimum Chemistry

06/23/2011 1:20 PM

Thanks Milo,

I will keep you informed.
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