[MW:1870] Re: Welding Thick S500QL & S690QL plates for Hydro Power

Hello Erhan;

I think PWHT method is necessary for that pressure.

Regards,

Tansu Ozcelebi
Manager
KREA Makina Muh. Ltd.Sti.
tansu@kreamakina.com
Tel : +90.232.478 59 78 Ext : 14
Mobile : +90.533.489 55 22
Fax : +90.232.478 60 32
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Bornova-IZMIR-TURKIYE

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On 3 Nisan, 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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