is pwht required for IS 2062 to SA387GR22 weld

[kevin mathew]

 hello all

any one can clarify below doubt

i want to weld SA 387 GR22 TO IS 2062 GR B,IS ANY PWHT REQUIRED OR NOT,IS REQUIRED HOW MUCH?CAN ANY GAVE A STATEMENT FRM CODE/STANDARDS.

Thanks & Regards

 

kevin mathew varghese

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[Sukamal Naskar]

Dear Mathew,

you have selected two different materials, one from ASME , P No. 5A and another one from IS, considering this one as carbon steel.

If you consider BS 1113, you can not weld this disimmilar material , because of the problem of PWHT. In BS 1113, there is a statement regarding the postweld temperature difference. As BS 1113 gives the temperature range for PWHT , The higher tempeature of the lower grade material and the lower temperature of the higher grade material difference should not be more than 20 deg C.

In this combination the difference is more than 20 deg C.

Please check with the design engineers. According to me , the P No 5A , application is much higher temperature than the Carbon steel , hence design should be considered.

I saw one old CE WPS using the E7018 electrode for that fillet weld combination without PWHT.

 

Regards,

 

[PB HEGDE]

Hi!

 I agree with Mr Naskar As such you can not  recommend to  weld P5A (2Cr 1 Mo Steel) to IS grade as PWHt temperature is above 675C and IS material will not give such high strength  after PWHt at above 675C. II) What is the service condition of this joint  (P5A material is having min 85Ksi strength while as against 65ksi for IS grade

Regards

 

Hegde p.B.

[Kural]

Mathew

 

I am not sure the application this ombinaton. Is it pessure vessel or attachment of a pressure vessel .

 

The PWHT shall be based on  Gr22 material.  This is to remove te residual stress. In case of pressure vessel and is deigned to ASME VIII please refer to the correponding code for time and temperature.This is also based on the lowest thickness between these two materials.

 

In general the PWHT temperature range is 705 to 760 Deg c.

 

The recommended weld procedure shall have preferably E70S2/E7018 . Since this is the combination of  carbon  to  Alloy steel the design would be based on IS 2062.However E8018 B3L ( electrode to match Gr 22) also used as wel.

 

Regards

 

Kural