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Technical Discussions
susan
susan
00:50 Jan-08-2009
penetrameter requirement

If I have a coblat material to x-ray but do not have any cobalt penes, is it acceptable to use Nickel penes? This is in regard to the aerospace industry.


    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 835

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
835
04:36 Jan-08-2009
Re: penetrameter requirement
Hi Susan,

From my experience when it comes to aircraft parts, the manufacturer i.e. Boeing, Airbus, Bombardier will have a specific procedure for you to follow. Having said that, if you are using other pennies then that specified in the procedure, you should request a deviation from the customer. I looked at ASTM E1025, but cobalt is not mentionned. Hope this will be of help.

Michel

----------- Start Original Message -----------
: If I have a coblat material to x-ray but do not have any cobalt penes, is it acceptable to use Nickel penes? This is in regard to the aerospace industry.
------------ End Original Message ------------




    
 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
07:50 Jan-08-2009
Re: penetrameter requirement
Susan,

Since I lack ready access to radiographic equivalents of different materials, I would request you to do that search. If cobalt and nickel are nearly equal in their absorption characteristics, you could use the nickel penetrameter instead of cobalt.

If you cannot access the data, you could take a radiograph of the cobalt object and a nickel block of the same thickness and see the density. If the density is comparable, you could go ahead.

Swamy
NDT Guru

----------- Start Original Message -----------
: If I have a coblat material to x-ray but do not have any cobalt penes, is it acceptable to use Nickel penes? This is in regard to the aerospace industry.
------------ End Original Message ------------




    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
07:57 Jan-08-2009
Re: penetrameter requirement
At least one engine manufacturer allows steel to be used in place of cobalt but I am not sure about nickel. A softer or less dense material may be used. The SPM I checked went so far to say use the penetrameter designated for the next greater part thickness if you are using a iron based penetrameter for nickel or cobalt. I checked the density of cobalt and nickel and they are nearly identical. Unfortunately, an auditor who doesn't understand the process could argue that nickel is actually a little denser and would disqualify the technique.

----------- Start Original Message -----------
: If I have a coblat material to x-ray but do not have any cobalt penes, is it acceptable to use Nickel penes? This is in regard to the aerospace industry.
------------ End Original Message ------------




    
 
 Reply 
 
K.B.Jetly
K.B.Jetly
03:37 Jan-12-2009
Re: penetrameter requirement
In Reply to S.V.Swamy at 07:50 Jan-08-2009 .

The fact that most of the properties such as Atomic Numbers ( Co-27, Ni-28), Atomic Weight ( Co-58.9, Ni- 58.7)Density( Co-8.92, Ni 8.90) are so close, Nickel penetrameters can certainly be used for Cobalt.

ASTM E1025 and E 747 show the flexibily regarding the penetrameter materials.

    
 
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