Re: Re: [MW:28988] SB-209 Grade 5183-PQR failure

Hi,

Read the patterns below.

https://www.twi-global.com/technical-knowledge/job-knowledge/mechanical-testing-tensile-testing-part-1-069 

https://www.twi-global.com/technical-knowledge/published-papers/loading-rate-effects-on-tensile-properties-and-fracture-toughness-of-steel-april-1999 

Thanks.

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From: Ramin Kondori

Date: 2019-01-27 20:57

To: materials-welding

Subject: Re: [MW:28982] SB-209 Grade 5183-PQR failure

You are dealing with Al-Mg alloys series 5000 and this particular alloy is work hardened and you did not tell anything about the temper which is an indication that you are not paying enough attention or maybe you need to take this to a professional.

If you are going to do it yourself, you should first study general technical aspects of welding Aluminum and then focus on this group (5000 series) and then focus more in this particular alloy which has the highest strength among all common industrial Al-alloys and is regarded as marine grades. There are others with higher strength but they are special alloys.

 

There are many factors involved and it is impossible to know the root cause without knowing if you have followed the ABC of Al-welding and then series 5000 and then this particular alloy. To apply an elimination method, you need to do everything right from the beginning so you can find out what is your problem. Forgive me for being straight but you are not going any where by trying to get short answers here.

I recommend you to spend enough time to study before trying to find out what went wrong. Then after you applied all ABCs of welding this alloy, then you can start looking for problems. At this point, it is very hard to help you.

Regards 

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

On Sun, Jan 27, 2019 at 6:57 AM Himan Nikdin <himan.nikdin@outlook.com> wrote:

Dear Ramin

Actually I'm trying for root cause, to avoid re-failure.

Regards,

Himan Nikdin

On Jan 26, 2019, at 16:22, Ramin Kondori <raminkondori@gmail.com> wrote:

You proceed to another PQR sample and all tests without changing anything ...?

I wish I was the lab which does the tests for you.

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

On Sat, Jan 26, 2019 at 10:43 AM Himan Nikdin <himan.nikdin@outlook.com> wrote:

RT done, some porosity observed, but in the acceptable critera per ASME IX. The sample totally broken, it does not seem that the failure occured due to weld defect. 

Regards,

Himan Nikdin

On Jan 25, 2019, at 08:44, Brijesh Maurya <brijeshmaurya492@gmail.com> wrote:

First you should do  the RT of sample to check if there is any defect in weld or not.

On Thu, Jan 24, 2019, 7:01 PM Himan Nikdin <himan.nikdin@outlook.com wrote:

Dear Experts

A PQR sample has been welded per below procedure;

SB-209 Grade 5183

THK; 40 mm

Process; GTAW

Filer metal; ER5183

Shielding gas; Argon

Preheat Temp; 70°C/Interpass Temp; 100°C

but all four bend samples rejected due to facture, meanwhile the tensile result is less than acceptable criteria.

would you please advise me in regards to the reason for this failure.

Thanks Indeed

Himan Nikdin

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