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- since 1996 -
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Technical Discussions
Sreenivasa Shenoy
Sreenivasa Shenoy
07:55 Mar-01-2016
Porosity on Weld overlay

Hi,

We have found porosity on 3mm weld overlay, after performing RT.
Please advise what is the tolerance to consider before rejection(reference standard to tolerance) and how to resolve this.

Thanks in advance!

 
 Reply 
 
Steven Doc
Other, Quality Manager
Siemens Energy, Egypt, Joined Feb 2011, 187

Steven Doc

Other, Quality Manager
Siemens Energy,
Egypt,
Joined Feb 2011
187
13:53 Mar-01-2016
Re: Porosity on Weld overlay
In Reply to Sreenivasa Shenoy at 07:55 Mar-01-2016 (Opening).

Hello Sreenivasa,
This is the wrong direction to be asking such a question.
You have performed Radiography because it is a stated requirement. Wherever this requirement is stated, you should also find direction to the acceptance criteria. Normally it would be mentioned in the Purchasing Order or the Purchasing Specification.

1
 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 805

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
805
23:58 Mar-04-2016
Re: Porosity on Weld overlay
In Reply to Sreenivasa Shenoy at 07:55 Mar-01-2016 (Opening).

what is size of porosity ? How do you know from RT that porosity is in overlay or in base metal ?

 
 Reply 
 
Cesar
NDT Inspector, Quality assurance Representative
Toronto Transit Commission, Mexico, Joined Sep 2014, 7

Cesar

NDT Inspector, Quality assurance Representative
Toronto Transit Commission,
Mexico,
Joined Sep 2014
7
02:02 Mar-05-2016
Re: Porosity on Weld overlay
In Reply to Sreenivasa Shenoy at 07:55 Mar-01-2016 (Opening).

Hi Screenivasa,
Who said "it is an over lay porosity"? the Xray test give you info as a volumetric test...there´s no way to define the depth...
If the porosity is located inside the crown you can grind it and the issue is solved. Unless the symbol shows the crown as a requirement.
Rule thumb...You can not inspect any thing if the code,specification, instruction are not defined first"
What are you inspecting; pipes, structures, trains, cars...?
Regards

 
 Reply 
 
Steven Doc
Other, Quality Manager
Siemens Energy, Egypt, Joined Feb 2011, 187

Steven Doc

Other, Quality Manager
Siemens Energy,
Egypt,
Joined Feb 2011
187
08:15 Mar-05-2016
Re: Porosity on Weld overlay
In Reply to Cesar at 02:02 Mar-05-2016 .

Cesar,
I made the assumption that the OP knows it is in the overlay because normally you would subject the Weld to RT prior to overlay to ensure the weld was acceptable, before commencing with the overlay.

 
 Reply 
 
amir amaru
NDT Inspector, - - gpr
marine, Algeria, Joined Mar 2010, 10

amir amaru

NDT Inspector, - - gpr
marine,
Algeria,
Joined Mar 2010
10
11:22 Mar-05-2016
Re: Porosity on Weld overlay
In Reply to Sreenivasa Shenoy at 07:55 Mar-01-2016 (Opening).

the fabriction code provide the acceptance cretiria

 
 Reply 
 
Annol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 805

Annol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
805
14:27 Mar-05-2016
Re: Porosity on Weld overlay
In Reply to Sreenivasa Shenoy at 07:55 Mar-01-2016 (Opening).

At this stage, do UT to find the location of porosity and then we will go to next step

 
 Reply 
 

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