Re: [MW:14554] USE of PQR of GTAW+SMAW for new WPS GTAW process only.

Hi Friends ,

 

As per ASME-IX QW-451.1 Table,

 

as per your ( Praveen Nakwal ) below mail info, the PQR Plate thk is 8 T and GTAW-3mm, SMAW-5mm deposited weld thk. ( t )  in PQR,

 

If PQR is 8T, then the base metal range qualified in WPS 1.5 to 16 T,

 

Also in WPS, GTAW weldmetal thk of Max 6 mm and SMAW of Max 10 mm is accepted.

 

So, there is no problem to weld by using GTAW for 2, 3, 4 mm BM thk., can write a separate WPS with GTAW only.

 

You can have 3 WPSs from this PQR, 1WPS for GT+SM combination,  1 WPS for GTAW only with Purging Gas, 1 WPS for SMAW only with backing plate or double side welds.

 

For lower thk basemetals in job, use lower size filler metals to avoid high current. For 2 mm plate, better use 1.6 dia GTAW filler with the parameters recommended by the manufacturer.

 

But ensure that, U have given Purging Gas for SS during PQ test, should be followed in WPS and job welds.

 

Also refer ASME-IX QW-200.2 (f)  Multiple WPSs With One PQR / Multiple PQRs With One WPS.

 

Hope it helps.

 

Cheers,

Saravanan,

S.Korea

On Thu, Jun 14, 2012 at 3:35 PM, yanfei Xiu <yanfeixiu@gmail.com> wrote:

Here is the answer for you as per ASME QW-451

1.the applicable range of thickness of BM is 1.5 to 6mm

2.the applicable range of thickness of Weld Metal is 0 to 6mm

regards,

Devin

2012/6/13 Himangshu Das <himangshu_das123@rediffmail.com>

Dear Sir,
Unable to clarify as it is not mentioned whether the PQR is qualified on a groove joint or fillet joint. Also it is not clear that the new WPS proposed to be supported by the PQR qualified is meant for welding groove joints or fillet joints.

H. Das




On Mon, 11 Jun 2012 15:21:04 +0530 wrote

>Dear Experts,
Can we use S.S to S.S 8mm base metal thickness PQR of GTAW (3mm)+SMAW (5mm) for the making for new WPS of S.S to S.S with GTAW only, with 2mm base metal thickness only ? 

Waiting for reply..

Regards.Parveen K. Nakwal

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