[MW:14746] Re: Impact test qualification requirement for WPS/PQR

Dear asad,

PQR-1

Test coupon thickness - 40 mm ,

Welding process used - GTAW + SMAW + SAW ==I proposed thickenss is 5 GTAW +19 SMAW +16 SAW

Weld deposit by SMAW  Process is 19 mm.

Weld deposited by SMAW  is impact tested at   0 deg celcius.

You can deposite SMAW == 38 (or unlimited) with Impact 0 Degree achievable

PQR-2

Test coupon thickness - 10 mm ,

Welding process used - GTAW + SMAW ==I proposed thickness is 2 GTAW ??+8 SMAW

Weld deposit by SMAW  Process is 8 mm.

Weld deposited by SMAW  is impact tested at    - 18 deg celcius.

You can diposite SMAW ==16mm with Impact -18 Degree achievable

Your Query:

Material thickness is 65mm and Process is GTAW+SMAW+SAW==12 GTAW+21 SMAW+32 SAW you want to weld with -18 Impact

Ans1: you can deposit only 16mm with SMAW with Imapct -18 degree.

OR

You have to Qualified PQR-1 for  -18degree if have some balance piece of PQR.

Regards,

mohd.

On Wednesday, March 14, 2012 1:31:31 PM UTC+3, asad azmi wrote:

Dear All,

 

Greetings.

 

A vessel is being fabricated as per ASME SEC VIII DIV 1.

 

Vessel material is SA 387 GR 12 CL2, 65 THK. MDMT is   -18 DEG CELCIUS.

 

Approved WPS is supported by  2 PQR  detailed as below --

 

PQR 1

 

Test coupon thickness - 40 mm ,

Welding process used - GTAW + SMAW + SAW ,

Weld deposit by SMAW  Process is 19 mm.

Weld deposited by SMAW  is impact tested at   0 deg celcius.

 

PQR 2

 

Test coupon thickness - 10 mm ,

Welding process used - GTAW + SMAW ,

Weld deposit by SMAW  Process is 8 mm.

Weld deposited by SMAW  is impact tested at    - 18 deg celcius.

 

Whether  PQR  2 can be used for SMAW  Process to deposit  21 mm weld in a weld groove of 65 mm in depth .( for closing seam of shell to dished head & nozzle to dished  head weld seam)

 

Please advice. please give ASME SEC IX Reference.

 

Thanks & Regards

 

Asad Azmi

 

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