Dissimilar welding of SS A312 TP316/TP316L with CS P n°1.1 & Pn°1.2

It depends on your code of construction (e.g., B31.3 or BPV VIII-1) and design conditions. If you share those, perhaps you'll get a better answer, but it's also recommended that you first check the codes yourself to find an answer. Anyone here can help you determine the answer, but you'll be better off learning that yourself. If there's a specific clause or section that you don't understand, then let us know.

Huub
- You never get what you expect, you only get what you inspect.

Section IX does not require impact testing. Other Codes or the purchaser based on the minimum design temp and stress may do so.