Thursday, January 10, 2013

RE: [MW:16481] Effect of Higher temp PWHT but below AC1 for PQR

Dear Hegde P.B

 

Yes, you can use the WPS with PWHT temp. below LTT. Pls. refer the below interpretation and also

You can refer alternate PWHT with decreased temperature and increased time in section VIII table UCS 56.1

Interpretation: IX-04-20

Subject:           QW-407.1, Welding Procedure Specification, Postweld Heat Treatment

Date Issued:    March 8, 2005

File No:           05-293

 

Question:         A WPS for joining P-No.4 to P-No.4 specifies that the PWHT be performed at 1125 deg. F +/- 25 deg. F, which is below

the lower transformation temperature for the material. May this WPS be revised to specify a PWHT performed at 1225 deg. F +/- 25 deg. F,

which is also below the transformation temperature, without requalification of the procedure?

 

Reply:             Yes.

 

Cheers

MM

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shomenath Bagchi
Sent: Wednesday, January 09, 2013 9:03 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:16473] Effect of Higher temp PWHT but below AC1 for PQR

 

PWHT time at peak temperture will be higher for thicker sections.

 

 


From: Prakash Hegde <pb.hegde@yahoo.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Tuesday, January 8, 2013 12:46 PM
Subject: [MW:16466] Effect of Higher temp PWHT but below AC1 for PQR

 

Dear Friends

 

I have a query

A)

I have qualified the PQR with Suplimentary Essential (Due to Impact test requirement) 

a)The base material is SA516 Gr 70 Thk-40mm

b)Process-SMAW

c)PWHT as per USC56  Actual PWHT cycle followed 600-620C Soaking temp with soaking time of 3hrs and 30min

d) Satisfied all essential variables including PWHT clauses

e)Impact tested at minus 30C

f)All test are satisfactory as per ASME sec IX

 

Now my querry is can I use above  PQR for making WPS for welding 190mm thk SA516 Gr70 material  with PWHT at 650-670C for 3hrs (As it is below transformation Temp AC1)

 

If you say yes then what is the effect of Higher temp PWHT  on mechanical properties of  SA516 Gr70 even though it is below AC1)

 

(As this PQR is not accpted by Client consultant for WPS welding 100thk material having PWHT temp 650-670C)

asThere is possiblity /references of detoriating the UTS at higher temp PWHT  e.g.As per LM parameter PWHT at660 C for 3 hrs is equivalent  to at  620c for 24 hrs )

Regards

 

Hegde P.B.

 

 

 

 

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