Sir, wishing you a very happy new year!! QW-200.4(b) is an alternative to QW-200.4(a). Under QW-200.4(a) we can combine the two PQRs, in my below case describe in my earlier email . Writing one WPS allowing both processes with the following ranges Base metal: 1.5 to 16 mm SMAW weld metal: 16 mm maximum SAW weld metal: 16 mm maximum. there is no need to use the alternative provisions in QW-200.4(b) to do that. Thus root pass PQR with 13 mm is not required. All I was looking is an interpretation if one js available. Thanks for your message. On Wed, 29 Dec 2021 at 3:03 PM Kannayeram Gnanapandithan < kgpandithan@gmail.com > wrote: There is revision made in QW 200.4, 2021 edition. In 2019, it is clearly mentioned that when combination is made, the process which is going to be used for Root pass, shall have qualified at least 13mm thick. In 2021, it is not specific about root pass process qualification thickness, but it is clear that u can combined/individual the process in whic...
Materials selection, welding, forming, Heat treatment, corrossion, NDT