Ferrite Testing
Ferrite Testing
(OP)
Can anyone offer guidelines for the appropriate use of ferrite testing of pipe welds in austenitic stainless steel? Is testing to determine the ferrite number of a completed weld anymore useful than examining the material certifications of the base metal and the filler metal?





RE: Ferrite Testing
RE: Ferrite Testing
RE: Ferrite Testing
RE: Ferrite Testing
Thread725-34135
RE: Ferrite Testing
Ferrite percent = vol% ferrite
(Fe) = wt% of Fe
FN = (vol% ferrite) x [-0.025813 (Fe)2 + 5.408679 (Fe) - 102.3902]/100
References
1. Welding Journal, 76(1): 24-s to 37-s, 1997
2. Welding Journal, 61(11): 352-s to 361-s, 1982
TomEun
RE: Ferrite Testing
www,fischer-technology.com
Ferrite in welds is reported as "ferrite number" rather than an actual volume percent ferrite. This is because it is rather difficult to get two labs to agree on ferrite % by metallography. The welding guys got together some years ago & decided to use the term "ferrite number" instead of an actual %
If the weld isn't cracked I'd say you have enough ferrite.