Re: [MW:19645] IMPACT TEST IN PTC AT -47 DEG

Dear Experts,

 

We are facing Impact Test failures problem after Normalizing the pipe fittings manufactured Impact Tested SA 5416 Gr. 70 Material at - 46 deg. C

 

We have put a lot of pipe fittings in our normalizing furnace 25 mm thk. & 14 thk pipe fittings, after that we have selected one sample each thk and Impact tested, the 14 mm thk fitting the passing the Impact test requirement for parent metal, HAZ & Weld as per ASME B 31.3 & the other sample 25 mm thk. failing the Impact requirement on Parent metal & HAZ and the Impact value we have observed 8 , 10 & 12 etc. and the 

 

Can any body explain the reason for the failures in Impact test requirements as per ASME B 31.1.

 

Regards,

 

D.Dattatreya.    

On Tuesday, December 20, 2011 10:16 PM, Dindo <dindodelacruz@gmail.com> wrote:

you have to monitor the actual welding of the coupon and make sure that you are within the parameters of the qualified WPS, if it still fails you can always send the coupon for stress relieving (which is more costly since you have to PWHT your vessel too)

On Mon, Dec 19, 2011 at 10:27 PM, Vivek Pandey <vivek.pande06@gmail.com> wrote:

DEAR EXPERTS

AT this time Iam facing a critcal problem in impact test at minus 47
deg. I have a already existing qualified PQR WITH E 8018G & IMPACT
Tested at -47deg. I have used the same PQR in  vessel production test
at -47deg but this PTC has failed in imapct test of WELD & HAZ at
-47deg we are getting erratic value 10, 12, 90 in weld & 60, 10, 50 in
HAZ

Kindly suggest your opanion  about this problem as soon as possible

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