[MW:2089] RE: 2087] Re: No Defect Revealed procedure ?

Hi Prem,

 

When you detect a defect by UT, you need to confirm this by RT as it is without doing the grinding. You proceed with grinding or gouging to weld repair only after UT & RT confirmed the existence of defect. Gouge or grind until the defect is removed. An experienced welder or grinder would know during gouging or grinding that he is able to remove the defect.

 

Next is to perform the welding repair, and then after weld repair, check again by UT and RT to confirm that the defect in the area has been repaired properly. If not, then you repeat the procedure.

 

Good luck.

 

PJ

SAVE TREES  - THINK BEFORE YOU PRINT

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shashank vagal
Sent: Monday, May 04, 2009 9:49 AM
To: materials-welding@googlegroups.com
Subject: [MW:2087] Re: No Defect Revealed procedure ?

 

Hi Prem, After repair you are supposed to perform the same NDT method first (here UT will tell you the depth etc more correctly than RT can, if the slag is not removed effectively. If it is removed and the repair is effective, that also, will be revelaed by UT) and then you should go for an additional NDT method as a counter check. Any other comments are welcome. Rgds, Shashank Vagal --- On Sat, 2/5/09, PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com> wrote: From: PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com> Subject: [MW:2080] No Defect Revealed procedure ? To: materials-welding@googlegroups.com Date: Saturday, 2 May, 2009, 8:47 PM Hi Friends Can anyone guide me about how to carry out NDR (No defect Revealed)procedure for Repair Welding. The matter is: We have a circ. seam of two shells ,1m OD,35mm thick.Material Alloy Steel (marine steel).Double V butt joint welded by SMAW. We landed up in a slag inclusion after RT. Now by UT we found out the depth of slag i.e 10mm from top and length 100mm. So we grinded upto a depth of 14mm from top. Then we conducted RT for ensuring No Defect was Revealed or Present. But surprisingly the RT film was just dark with lot of density variations and we could not confirm whether the defect (slag) was removed or not as it was difficult to interpret the radiograph. Now can anyone help me out : How do we ensure by Radiography that the defect is removed after grinding. i.e how do we conduct Radiography of such partially grinded areas. Also the material can be repaired only twice, hence i want to confirm that the slag at depth of 10mm is completely removed before welding. Are there any other NDT method for doing NDR for repairing welds ? Regards Prem S Nautiyal Cell:9820313278 PREM S NAUTIYAL CELL : 9820313278 Bollywood news, movie reviews, film trailers and more! Click here.</a

 

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