I have a enquiry concerning the base metal thickness qualification
(ASME IX) range for a welding procedure of duplex stainless steel with
solubilization PWHT. I tried to get a response from ASME, but I did
not receive any answer.
According to QW-250s tables PWHT, for many welding technologies the
PWHT limits the maximum qualified thickness as per QW-407.4. This
article says: "For ferrous base metals other than P-Nº 7, 8 and 45,
when a procedure qualification test coupon receives a PWHT exceeding
the upper transformation temperature, the maximum qualified base metal
thickness, T, shall not exceed 1.1 times the thickness of test
coupon".
As far as I concerned, upper transformation temperature is Ac3
(ferrite to austenite transformation while heating) for a ferritic-
perlitic carbon steel.
If I have a coupon of 25 mm thickness of Dupex SS and I apply a PWHT
at 1100ºC + Water quenching, ¿what do you think should be the maximum
qualified thickness range? 27.5 mm or 50 mm.
Regards.
Materials Science Ph.D Pedro Alvarez
LORTEK - Joining Technologies Research Institute
Spain
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
No comments:
Post a Comment