Base metal thickness (impact-qualified) you have now: from 6 mm PQRs - 3 mm to 12 mm.
1. GTAW weld-metal thickness (impact-qualified) you have now: GTAW from the 6 mm coupon (practically ≤12 mm
unless the PQR deposited 10+ mm).
2. SMAW weld-metal thickness (impact-qualified) you have now: SMAW from the 6 mm coupon (again, small, not
anywhere near 200 mm).
3. What you do not have: any impact-tested PQR that can justify base thickness up to 200 mm or GTAW weld metal
20 mm /SMAW weld metal 200 mm for an impact-required WPS. The 40 mm non-impact PQR cannot be used to
fill that gap.
What you need to do to reach the ranges you want:
To qualify the base thickness up to 200 mm for impact toughness
1. Obtain a PQR with impact testing on a coupon T ≥ 100 mm (As most rules let you qualify up to 2T). If you take
T -100 mm and do impact tests according to the spec, you can qualify up to 200 mm (subject to other code
requirements). Alternatively, follow the exact QW-403.6 limits for your material and code application - but in practice,
you'll need a much thicker impact PQR coupon than 6 mm.
2. To qualify, GTAW weld-metal 20 mm make sure the GTAW deposit thickness t in the impact PQR is ≥ 10 mm
(so 2t ≥ 20 mm). Run a GTAW impact PQR coupon with sufficient deposited weld metal.
3. To qualify SMAW weld-metal 200 mm; that's enormous - to get 2t -200 mm, you'd need t -100 mm of deposited weld
metal in the coupon (impractical). 200 mm is typically achieved only by a very large coupon and is not a practical
weld-metal deposit on a lab coupon. .
C Sridhar.
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--Interpretation #: BPV IX-18-34Record Number: 18-771Subject Description: SC IX; QW-401.1 and QW-403.6 - Thickness Range Qualified for Impact Testing Standard Designation: BPV Section IX Par/Fig/Table: QW-401.1 and QW-403.6 Edition/ Addenda: 2017Background:A welding procedure qualification was performed on a 40 mm thick test coupon in 1G position by GTAW (10 mm) and SMAW (30 mm). Tension and bend tests were performed on the 40 mm plate.A second welding procedure qualification was performed on a 6 mm plate in 3G position by GTAW and only impact testing was performed. A third welding procedure qualification was performed on a 6 mm plate in 3G position by SMAW and only impact testing was performed. All of the essential variables remained the same except for the coupon thickness.Question:May the PQRs listed above, support a WPS (GTAW+SMAW) for material requiring notch toughness with a qualified base material thickness range of 5 mm to 200 mm, GTAW weld metal thickness range 20 mm max. and SMAW weld metal thickness range up to 200 mm max.?Reply: Yes.My queries . Is it in orderTHANKS & BEST REGARDS,KG.PANDITHAN, BE, IWE, CSWIP 3.1,ISO 9712 Level 2 in VT,ASNT-Level II in PT,MT,RT & UT,LA ISO 9001-2015, ISO 3834, EN 15085,International Welding Engineer.CONSULTANT-WELDING & QUALITYMobile no: +919940739349
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