January 9, 2022 at 9:07 am #13967WICKeymaster
# Description Reference/Section Remarks 1 Standard application ASME IX 2021 Edition 2 Welding variables QW-250 2.1 Joints QW-402 · All weld variables are grouped in “nonessential” column.
· You may change any type of joint in the WPS.
2.2 Base metal QW-403 · Consider “T Limits” and ”T qualified”.
· Verify the Group Nos and P-Nos are in QW-421 and Table QW-422
2.3 Filler metal QW-404 · Verify the F-Nos and A-Nos in Table QW-432 & QW-442.
· Verify the classification of electrode or flux in the PQR and range of qualification on the WPS.
· Thickness of weld metal deposit to be checked carefully in the PQR and QW-451.
2.4 Positions QW-405 · All weld variables are grouped in “nonessential” column à qualified on flat position shall qualify for all position, except SAW process. 2.5 Preheat QW-406 · Min. preheat and max. inter-pass temperature determine in the PQR and for each welding process, each set of welding. 2.6 PWHT QW-407 · Determine thickness, time, and temperature in the construction code and additional procedure/PWHT instruction to be provided. 2.7 Gas QW-408 · Gas composition and gas mixture see AWS A5.32.
· Consider “- deletion” backing gas in the WPS.
2.8 Electrical characteristic QW-409 · Verify welding parameter and heat input for small bore and different welding position. 2.9 Technique QW-410 · Verify number of electrode and pass per side. 3 Lesson learned 3.1 New edition application QG-100 (d) 3.2 Combination of welding procedure QW-200.4 · Min. thickness of test coupon should 13 mm and thicker. 3.3 Volumetric NDE for the test coupon QW-190 · Not required, optional. see QW-141. 3.4 Content of PQR, WPS QW-200.1 · Bring all essential in QW-250 to the PQR and WPS. 3.5 Testing position QW-405 · Qualified on plate shall qualify for pipe and in any positions. 3.7 Pre-setting the test coupon on plate QW-402 · Presetting 20~50 angle to prevent angular distortion after welding from single side application. 3.8 Make the single process on the test coupon QW-250 · For combination or separate each process in the WPS, PQR should run with a single process with backing or without backing. 3.9 Welder qualification on fillet welds QW-452.2 · Additional test specimen of fracture test for welder qualification certificate.
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