Impact testing of dissimilar joint.

[Muhammed Ibrahim]

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

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Thanks & Regards
Muhammed Ibrahim PK

[Ramprasad Chari]

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!!"

[western....@gmail.com]

Dear All,
May some one help us for the Welding of C12A cast grade material ( wrought grade is F91) .
We are facing the problems of cracks after weding. We are heating the castings at 200 deg cen and weding rods baking temp at 300 deg cen.

Sanjay

Sent from BlackBerry® on Airtel

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From: "Ramprasad Chari"
Date: Mon, 1 Dec 2008 13:06:50 +0530
To: <material...@googlegroups.com>
Subject: [MW:1367] Re: Impact testing of dissimilar joint.

[Muni Andy]

Dear Friends,
Normally impact testing is to be done for the lowest operating temperature.In this case minus 87 °C.
HAZ To be tested is SA203.
PWHT TO BE DONE.
Regards,
C.Muniyandi

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

[Muni Andy]

Dear Sanjay,
you have not mention the electrode you were using.
C12A Material is prone to crack.
200°C is not sufficient for castings.you heat to 300°C.
After welding it should not be exposed to atmosphere.Wrap it with asbestos wool.
you will not face crack problem then.
C.Muniyandi

[Quality]

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: material...@googlegroups.com

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

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