[MW:1372] Re: Impact testing of dissimilar joint.

Dear all,

 

There could be a mistake in the Design as far as MDT is concerned. You can not have 2 different DMT at one location/ system.

 

If the DMT at the interface/ weld joint is -87°C, all components must meet this requirement. if so, one of the material selected for that region is wrong.

If the DMT at the interface/ weld joint is -29°C, both the components meets this requirement (this is possible & designer must have considered the temperature gradient). if so, Impact test to be done at -29°C only.

 

Regards,

Sanjeevan

----- Original Message -----

From: Ramprasad Chari

To: materials-welding@googlegroups.com

Sent: Monday, December 01, 2008 11:36 AM

Subject: [MW:1367] Re: Impact testing of dissimilar joint.

Unable to understand the text of the mail.However worst condition prevails.Impact testing is required for MDMT colder than -48 deg C.Do not know what is the vessel thk.If it is 50mm and below than Impact temperature is -101 deg C for A203GR E.If job calls for PWHT than test pc also is to be subjected to PWHT.

Regards

Aarpee

P.S. Many a times it is noticed that the contents of querry is not understood well.Please try to have more clarity and less ambiguity.One thing is sure that "when you write,write for your readers!!"

On Sun, Nov 30, 2008 at 2:08 PM, Muhammed Ibrahim <ibratech@gmail.com> wrote:

Dear Friends,

 

I have to do a welding procedure for welding  SA203 Gr.E to SA 516 Gr.70. Process GTAW+SMAW. The joint thickness is 19.0 mm. The MDMT for 516 gr.70 portion of vessel is  minus 29 degree C and the MDMT of SA 203 side is minus 87 degree C. The CS portion is exempted from impact test as per curve D in Sec. Viii Div.1. SA 203 Gr.E is also reffed in Curve D.

 

 Is it required to do impact testing of this joint?. If it required, at what temperature? .-29 degree C or -87 degree C?.

 

 If it is required, which HAZ I have to test?. 203 side or 516 side?.

 

PWHT is asked for 203 material side. Is it required PWHT for this dissimilar joint also?

 

Your advise will be highly appreciable.

Thanks & Regards
Muhammed Ibrahim PK

--
Thanks & Regards
Muhammed Ibrahim PK

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