ferrite testing

[engineer54]

Is ferrite test of Austenitic stainless steel done before and after welding or just after? What is the optimal ferrite so as to avoid cracking.

 

[metengr]

It is done after welding, namely the weldment itself. 5 FN or higher, depending on the weld filler metal.

 

[EdStainless]

It depends on the alloy and the size of the weld (and how tightly constrained it is).
Depending on conditions specs usually require a 4 or 5 minimum, and some have a max (as low as 8 and some up to 14).

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[SJmetallurgist]

Agree with Metengr with an addition. Ferrite test is done after welding but before any PWHT.