Forgot to mention in my previous mail that in my opinion you only need
to apply Soaking when using welding proces / filler metal / flux with
Hydrogen content > 5 ml. When using processes with low hydrogen
containing filler metals and controlled parameters during welding it
is not obligatory. Be aware of storage of filler metals under
controlled conditions as well for this reason.
Regards,
Herman Pieper
On 3 apr, 16:17, Erhan Turgut <ertur...@gmail.com> wrote:
> Hi,
> 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
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