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Technical Discussions
Devendra Kumar
Devendra Kumar
03:09 Apr-09-2003
X ray of 9 % Ni welds

i am feeling a difficulty in getting required density in radiography of 9 % Ni material welds.
Can any one suggest me what parameter to be used for the same.

I tried with 280 Kv & 5 mA
Thichness - 10-25 mm

But i am getting a high density in HAZ & PM


    
 
 
DJ Kallhof
DJ Kallhof
06:46 Apr-09-2003
Re: X ray of 9 % Ni welds
: i am feeling a difficulty in getting required density in radiography of 9 % Ni material welds.
: Can any one suggest me what parameter to be used for the same.
.
: I tried with 280 Kv & 5 mA
: Thichness - 10-25 mm
:
: But i am getting a high density in HAZ & PM

Devendra,

I would suggest trying a faster film if you are able. The wider latitude may suffice in bring the densities close enough together for a single film technique. A multi film technique is another option. Filtering the beam is yet another option. I personally use 0.073" of aluminum to filter out the weaker end of the spectrum and cut back on scatter. Often times, cutting out the scatter and accenting the primary is all you need.


    
 
 
Fred Raco, Jr.
Consultant, Partner in NDT Laboratory
RNDT, Inc., USA, Joined Jul 2002, 24

Fred Raco, Jr.

Consultant, Partner in NDT Laboratory
RNDT, Inc.,
USA,
Joined Jul 2002
24
02:02 Apr-10-2003
Re: X ray of 9 % Ni welds
: i am feeling a difficulty in getting required density in radiography of 9 % Ni material welds.
: Can any one suggest me what parameter to be used for the same.
.
: I tried with 280 Kv & 5 mA
: Thichness - 10-25 mm
:
: But i am getting a high density in HAZ & PM

You may want to try using two different film speeds in the same cassette for each exposure. One film may cover the weld material and the other film may cover the HAZ & PM. This will require a penetrameter for the weld, the HAZ, and the PM.
Regards,
Fred Raco, Jr.
President - RNDT, Inc.
Johnstown, PA
.



    
 
 
James
James
06:16 Apr-14-2003
Re: X ray of 9 % Ni welds
: :


i am feeling a difficulty in getting required density in radiography of 9 % Ni material welds.
: : Can any one suggest me what parameter to be used for the same.
: .
: : I tried with 280 Kv & 5 mA
: : Thichness - 10-25 mm
: :
: : But i am getting a high density in HAZ & PM
.
: You may want to try using two different film speeds in the same cassette for each exposure. One film may cover the weld material and the other film may cover the HAZ & PM. This will require a penetrameter for the weld, the HAZ, and the PM.
: Regards,
: Fred Raco, Jr.
: President - RNDT, Inc.
: Johnstown, PA
: .
.
I think your penetrating power is much too high for that material thickness (1/2" - 1"), reduce the KV to 180.
James Ray
President
Worldspec


    
 
 
Mike
Mike
03:39 Apr-14-2003
Re: X ray of 9 % Ni welds
: : :
.
:
: i am feeling a difficulty in getting required density in radiography of 9 % Ni material welds.
: : : Can any one suggest me what parameter to be used for the same.
: : .
: : : I tried with 280 Kv & 5 mA
: : : Thichness - 10-25 mm
: : :
: : : But i am getting a high density in HAZ & PM
: .
: : You may want to try using two different film speeds in the same cassette for each exposure. One film may cover the weld material and the other film may cover the HAZ & PM. This will require a penetrameter for the weld, the HAZ, and the PM.
: : Regards,
: : Fred Raco, Jr.
: : President - RNDT, Inc.
: : Johnstown, PA
: : .
: .
: I think your penetrating power is much too high for that material thickness (1/2" - 1"), reduce the KV to 180.
: James Ray
: President
: Worldspec
.
Of course, the *President* of Worldspec would know that a reduced Kv would make the problem worse :-)

But seriously, if the problem is so bad, isn't the weld cap and/or root, too high/thick and not acceptable to specification?


    
 
 
DJ Kallhof
DJ Kallhof
04:39 Apr-16-2003
Re: X ray of 9 % Ni welds
: : : :
: .
: :
: : i am feeling a difficulty in getting required density in radiography of 9 % Ni material welds.
: : : : Can any one suggest me what parameter to be used for the same.
: : : .
: : : : I tried with 280 Kv & 5 mA
: : : : Thichness - 10-25 mm
: : : :
: : : : But i am getting a high density in HAZ & PM
: : .
: : : You may want to try using two different film speeds in the same cassette for each exposure. One film may cover the weld material and the other film may cover the HAZ & PM. This will require a penetrameter for the weld, the HAZ, and the PM.
: : : Regards,
: : : Fred Raco, Jr.
: : : President - RNDT, Inc.
: : : Johnstown, PA
: : : .
: : .
: : I think your penetrating power is much too high for that material thickness (1/2" - 1"), reduce the KV to 180.
: : James Ray
: : President
: : Worldspec
: .
: Of course, the *President* of Worldspec would know that a reduced Kv would make the problem worse :-)
.
: But seriously, if the problem is so bad, isn't the weld cap and/or root, too high/thick and not acceptable to specification?
.
Before this gets any worse lets find out something about the materials involved. A 9% Ni weld tells me nothing. What is the base metal? What is the filler wire? The AMS numbers may tell everything. One of the turbine cases I shoot is made of A-286, a specialty stainless with app. 25% Ni. The filler wire is an AMS 5786 with a 63% Ni content. With no build up the filler wire stands out like a sore thumb.


    
 
 

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