Re: [MW:18811] [MW: 18787]Usage of GTAW and SMAW combination for pipes above 1.5"

general practice in power industries is if pipe thickness is less than 6mm, full TIG, if thick is more  than 6mm then TIG+SMAW

On Sun, Sep 29, 2013 at 2:20 PM, Saravanan Sornam <saravanshyla@gmail.com> wrote:

Hi sumod,
Yes you can use GTAW and SMAW combination provided your PQR is qualified without PWHT as you said and ensure any restrictions like GTAW only to be used until 3" pipes as per your spec. I think shell DEP , PDO specs have these limitations.
Regards
Saravanan.

On Sep 29, 2013 5:17 PM, "sumod s" <sumod.sadhupuram@gmail.com> wrote:

sir,

 

The combination WP which I have only GTAW range up to 6 mm & SMAW range up to 12 mm. So I cannot split this WPS to use GTAW for 1.5"(7.14 mm thick), 2" (8.74 mm thick) & 3" (11.13 mm thick)pipes. So Can I use the combination- GTAW + SMAW for these pipes.

 

sumod

On Sun, Sep 29, 2013 at 8:03 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:

What is max weld metal thickness in PQR. u can use single process separated from combination provided all essential  variables are addressed,

On Sat, Sep 28, 2013 at 2:42 PM, Octane Mac <octane.mac@gmail.com> wrote:

Yes, there is no issue in doing that.

You can use only GTAW if the thickness range with GTAW on the qualified procedure covers up to the maximum thickness of 3" pipe that is 11.13.

Octane

On Sat, Sep 28, 2013 at 6:28 AM, sumod s <sumod.sadhupuram@gmail.com> wrote:

Dear experts,

 

Material is Gr.P22 alloy, thickness is less than 13 mm. The WPS which I have for GTAW need PWHT. But since the thickness is less than 13 mm I need to avoid PWHT.

Unfortunately I don't have WPS for GTAW with out PWHT, but I have a GTAW + SMAW wps without PWHT which will cover the required thickness range. Can I use GTAW + SMAW combination for welding 1.5"(7.14 mm thick), 2" (8.74 mm thick) & 3" (11.13 mm thick)pipes.

 

sumod

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