[MW:748] Re: how to find hydrogen concentration

One of the reason for determining the hydrogen in steel is to make
critical decisions which involve welding / repairs in an inservice
vessel. Vessels which operate in environments where significant amount
of hydrogen charging occurs face a threat of cracking during weld
repairs if there is significant amount of dissolved H2 in the
material. For such instances, the vessel / part is first subject to
hydrogen bake out and then weld repaired. Hydrogen bake out should be
good enough to bring down the hydrogen level below the critical level.

I am not sure why dissolved hydrogen is critical in new fabrication.

Regards,
Jignesh Patel

On Apr 23, 6:21 pm, "Raghuram Bathula" <raghurambath...@gmail.com>
wrote:
> May i know why you need this calculation? if possible please detaile it for
> the benifit of all members. probably the following would help you!
>
> This formula is used for detecting cracking susceptibility of steels and is
> valid only for certain range of steels
>
> Where *P*H is the cracking susceptibility parameter, H is the concentration
> of hydrogen (in parts per million), *R*f is the restraint stress (in
> megapascals), and:
>
> Good luck!
>
> On Wed, Apr 23, 2008 at 3:28 PM, mech <arunmech...@gmail.com> wrote:
>
> > is there any mathematical formula to find optimum level of hydrogen
> > concentration in steels

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