WPS WITH IMPACT TEST AS PER ASME SECTION IX

Date 12-06-2007 05:14

I WANT TO QUALIFY A WPS FOR 6MM TO 32MM WITH IMPACT TEST. BUT I HAVE TWO PQRS ALREADY QUALUFIED. ONE IS WITH TEST COUPON THICKNESS 7MM WITH IMPACT TESTED & OTHER MECHANICAL TESTS DONE AS REQUIRED BY ASME SECTION IX (THIS COVERS THE RANGE FROM 3.5MM TO 14MM) SECOND PQR QUALIFIED IN TEST COUPON THICKNESS OF 19MM (WITHOUT IMPACT TESTED BUT OTHER MECHANICAL TESTS DONE AS REQUIRED BY ASME SECTION IX) (THIS COVERS THE RANGE FROM 5MM TO 38MM) BOTH ARE QUALIFIED WITH PREHEATING (100 DEG C). BOTH THIS PQRS WILL SUPPORT MY WPS REQUIRED FOR 6MM TO 32MM WITH IMPACT TESTED WITHOUT PWHT. AND IT WILL SUPPORT FOR THE WPS 6MM TO 38 MM(WITHOUT PWHT AS BOTH PQR1 & PQR2 ARE QUALIFIED WITH PREHEAT)?

By jon20013 (*****)

Date 12-06-2007 07:30

Where Impact Testing is required, be very careful with the MINIMUM qualified thickness, in your instance, if the PQR is 7mm thick, the minimum thickness of the WPS is 7mm (See QW-403.6) NOT 6mm however, if your PQR is 6mm thick then yes, you would be allowed 1/2t or 3.5mm as you indicate.

By js55

Date 12-06-2007 15:18

Keep in mind to that construction codes often have different ideas about qualfiied thicknesses under impact regimes.
Just becasue its good for Section IX don't make it good for BPV or PP codes.

Good to see ya jon.

By jon20013 (*****)

Date 12-07-2007 01:47

Very good clarification js55! Hope your doing well!

By Noel Tan (**)

Date 12-11-2007 01:19

jon20013

ASME IX stated less than 6mm that means it is not included 6mm.
so 6mm does not qualfied 1/2t

Noel

By Noel Tan (**)

Date 12-11-2007 01:16

may i know u are intend to
case 1) qualify a WPS to weld 6mm to 32mm (same joint different thickness) during production or
case 2) have a WPS just for the range of qualification from 6mm to 32mm?

if case 1, please refer to 202.4 (b-1) for some P number, u only need a qualified WPS base on 6mm.
that's means only PQR tested at 6mm coupon with charpy-v impact can be used.
if P number does not fall into 202.4 (b-1), u will need to follow case 2).

if case 2, for sure u will need at lease 2 PQRs with charpy-v impact tested,
1) 6mm to qualified from 6.0mm to 12.0mm, as what jon20013 has mentioned 7mm does not qualified 6mm when charpy impact is required.
2) min. 16mm needed as to qualfy up to maximum of 32.0mm