[MW:2080] No Defect Revealed procedure ?

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
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---

Subscribe to: Post Comments (Atom)

[MW:35346] Cast-iron welding

Any advice for cast iron welding Sent from Yahoo Mail for iPhone

• Materails FAQs

  Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? ...
• RE: [MW:5585] Buttering of weld joints

  Definition of buttering from ASME Section IX, QW/QB-492 Definitions:   Buttering:  the addition of material, by welding, on one or bot...
• 

  WELD AND WELDING SYMBOLS

  Section I. PRINT READING 3-1. GENERAL a. Drawings . Drawing or sketching is a universal language used to convey all necessary information to...

Search This Blog