We're working on 2700 mm dia. pipes with a thickness range of 26 - 40 mm
for S500QL and 30 - 48 mm for S690QL.
These penstocks will be used in hydro power plant with a pressure of
aprx. 140 bar
We have two methods for welding: SAW on GTAW (root GTAW, fill & cap SAW)
and SMAW on GTAW. We will try to achieve max. 12 kJ/cm heat input.
So shall we apply PWHT (Stress relief)? If yes what is the thickness
limits for PWHT.
We planned to apply Soaking (Hydrogen Releasing) with a temperature of
aprx 250 oC for 2.5 - 3 hours. So if we apply Stress relief
heat-treatment with a temp. of 550 oC for 1 hour do we have to apply
soaking anyway?
Thanks in advance
Regards,
Erhan TURGUT
--~--~---------~--~----~------------~-------~--~----~
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