ROOT GAP QUALIFICATION WHEN QUALIFYING WPS/PQR/WPQ

[JAY]

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. 

[Rajesh Kasvala]

Joint design non essentials veriable

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[Nithin Joseph]

Dear,

There is no limit,  you can follow any root gap.

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Dsilva

[syed moinul hasan]

Separately, There is no Root Gap qualification in code as its non-essential variable as per ASME IX.

Hence , cheers  go ahead and maintain the gap as appropriate. 

On Wed, 11 Jul 2018 at 16:16, Nithin Joseph <nithind...@gmail.com> wrote:

Dear,

There is no limit,  you can follow any root gap.

On Wed, Jul 11, 2018 at 9:04 AM, JAY <jay00...@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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Regards,
Dsilva

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[Prakash Gotimukul]

Root gap is not an essential variable. It is based on skill of the welder. It is general practise to specify tolerznce as it is a fabrication work not machining. So you can say 1.5mm+1.5 mm

Rgds.
Prakash G  AIS

[jay prajapati]

Dear,

As it is NON essential Variable. but is there any range/ limit up to which i can joint design? 

[Ramesh]

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"

[jay prajapati]

Dear Joseph,

Is there any statement mentioned in standard?

On Wed, Jul 11, 2018 at 5:46 PM Nithin Joseph <nithind...@gmail.com> wrote:

Dear,

There is no limit,  you can follow any root gap.

On Wed, Jul 11, 2018 at 9:04 AM, JAY <jay00...@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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Regards,
Dsilva

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[Souravbohray]

no root gap is come under joint design nd it is non essential variable nd sometime its depend upon welder.welding consumable dia.welding progression

[Souravbohray]

mr jay there is no statment regarding root gap. simple in wps u mention as per fabrication drawing in column of wps.i have experience of this nd i got guidline about this from ASME Authorised Inspector.dnt worry go ahead

[jay prajapati]

Dear Sourav,

Thanks you so much for clear my doubt on this topic.

This is the only group from where i can get satisfactory answer.

Also humble request to Team, if there is any other groups related to engineering field like this,Then please share to explore  batter experience.    

On Sat, Jul 14, 2018 at 11:30 AM Souravbohray <ermechsou...@gmail.com> wrote:

mr jay there is no statment regarding root gap. simple in wps u mention as per fabrication drawing in column of wps.i have experience of this nd i got guidline about this from ASME Authorised Inspector.dnt worry go ahead

[Er Sourav Bohray]

its ok and one more imp thing it is not compulsory to maintain uniform root gap throughout because in 3g position when moving upward more penetration required so need more gap but range should be not more than 2mm its mean at starting u make 2mm root gap but at upward 3 or 3.5 mm gap its ok.select consumable dia equal or less than root gap not more than root gap it vill cause lack of penetration.

This is best group i solve n learn about lot for my doubts its my daily routine to go through the posts of this group because all post n replies are based on experience sometime practical is more helpful than theory

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