Hi, I developed a P1 to P1 procedure using 1-1/2" thick coupon to qualify weld deposit thicknesses of 3/16" to 8" [5/8" to 8" with impacts as QW-403.6 permits] and a 3/16" thick coupon for 1/16" to 3/8" [3/32" to 3/8" with impacts as QW-403.6 permits]. To qualify this procedure for impacts I used two PQR's where impacts were performed on the 3/16" coupon only to qualify both coupons; as permitted by ASME Interpretation: IX-07-09.
Subject: QW-401.3 and QW-403.6, Thickness Range Qualified for Impact Testing (2007 Edition)
Date Issued: May 1, 2008
File No: 08-576
Background: A welding procedure qualification was performed on a 1 in. (25 mm) thick test coupon. Tension and bend tests were performed on the 1 in. (25 mm) plate. A second welding procedure qualification was performed on a 0.24 in. (6 mm) plate and only impact testing was performed. All of the essential and supplementary essential variables remained the same except for the coupon thickness.
Question: May the above PQRs be used to support a WPS for materials requiring notch toughness with a qualified thickness range of 0.1875 in. (5 mm) to 2 in. (50 mm)?
My question is, based on the thicknesses qualified from both coupons, thickness ranges for impacts are 3/32" to 3/8" and 5/8" to 8"; can we assume thickness ranges of 3/8" to 5/8" also qualified?
I appreciate your insight.