Preheat for 12thk is not mandatory, but always preferred. Refer Non-mandatory appendix-R of ASME Sec VIII Div.1 for reference.
For 12thk as per UCS-56 Table PWHT is not mandatory. Hence advised to select thk 16mm or above for your project.
Root pass can be welded by either TIG or SMAW with the back grinding for SMAW process. No. of passes shall be based on dia of filler wire/electrode, current/voltage & travel speed. Advised to weld the joint with the lesser heat input.
In case of applicability of PWHT, advised intermediate stress relieve at temp of 450deg for 30 minutes prior to final heat treatment, if heat treatment is not performed immediate after welding.
Regards
Sudhir Kumar
Sudhir kumar
On Tue, Nov 20, 2012 at 7:29 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
preheat is always better, if not possible, ok for 12mm plate
since it is plate and both side welding is possible, so tig for root
not require
Pandithan/9940739349
welding consultant
Madurai
On 11/19/12, Vivek Jain <vivek.anuj.jain@gmail.com> wrote:
> Sir,
> I am carrying out a final Year project on Effect of PWHT on
> "Mechanical properties of Weldmenst of SA387 GR11 Cl2 (Cr1.25%, Mo0.5%)".
> I need to know that is it important to Preheat the Material before
> welding and how we should arry out welding(Is it Important to carry its
> root pass from TIG)
> How Many passes we should do for welding the 12 MM plater of this
> material.
>
>
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