Re: [MW:28059] ROOT GAP QUALIFICATION WHEN QUALIFYING WPS/PQR/WPQ

Hi

QW-402.6  " An increase in the fit‐up gap, beyond that initially qualified."

 

For EBW,LBW it is Essential variable (QW 260 & QW 264)

For GTAW,  QW- 402.6 is not applicable / Not specified at all. 

 

Even for EBW,LBW, in case root gap is qualified with 1 mm, increase more than 1mm is not allowed. So there is No range of qualification.

 

For GTAW, it's the ability of welder to fuse both roots to make smooth weld. I  have seen an welder done with 15mm gap without issues.

 

Better to strict with PQR root gap to achieve your production weld mechanical requirements / NDE requirements

Thanks and Regards

Rameshkannan Devaraj

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Wed, Jul 11, 2018 at 4:20 PM JAY <jay0000.jp@gmail.com> wrote:

Dear Team,

I have some question in my mind regarding WPS/PQR/WPQ Qualifications. Explain below.

1. I have qualified wps with(SAME SEC IX)-

    Materials : SA 240 GR 316L TO SA 240 GR 316L (P8 G1 TO P8 G1)

    Process : GTAW.(with back gauge)

    Thickness: 8 mm to 8 mm.

    Root gap: 1.6 mm

 

     Now my question is about root gap qualification,

     If i qualify WPS with above parameters having root gap 1.6.The range qualification of thickness is 4 to 16 mm. likewise is there any range for Root gap qualification?

    YOUR ASSISTANCE IN THIS MATTER WOULD BE GREATLY APPRECIATED. 

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