We are welding an offshore pipeline with Auto-GMAW process using copper shoes for backing during root pass.
We have a problem with root pass that ocurs like concavity spot 5 mm in dia. In front and after fault weld is completely sound. What could be the reason for such kind of fault? Is it some...
Please, could anybody explain to me in brief how to menage with toughness classes(CV1 to CV2ZX). Is it some characteristic to ask steel manufacturer to test toughness in special way and how it reflects WPQ CVN testing? What the supplier must do with CVN testing?If I am preparing WPQ for...
In this moment I am working as welding engineer on Sakhalin pipeline project. In the last few weeks we are faced with constant notch toughness failures in welding qualification program. In spite of all my experience there is lack of time and possibility to explore the problem in details and...
Is it possible per ASME IX and B 31.3 and B 31.8 to have qualified WPS with PWHT and to avoid qualification for the repair with same essential variables using qualified previous main WPS procedure. The second PWHT will be performed after repair in the same way as qualified by the main WPS.
Please, kindly ask for your help.
1. In ASME Sec IX,QW -452.1(b) is stated "Maximum to be welded". Does it mean "Unlimited" or something else? Why isn’t it written "Unlimited"?
2. Why ASME Sec IX doesn't have P-Number 2. What happened with this P-2.
Thanks in advance
Darko
