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I’m frustrated; after working in this field for so many years, I keep running into funny situations

2021-03-26View Original

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I encountered this issue today: Pipe material: 20G; Argon arc welding is used for the root layer with ER50-6, while electric welding rods are used for the overlay layer with J427. The ER50-6 grade and J427 are not the same strength grade; so is it possible to use them together? They’re all of the same level; how come there’s one that doesn’t play by the rules? Does anyone know how the regulations specify this? So no matter how it’s combined, as long as PQR is qualified, that’s enough?

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