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Technical Discussions
Dhiren Gandhi
Director,
Siddhi Steels Pvt. Ltd., India, Joined Nov 2011, 1

Dhiren Gandhi

Director,
Siddhi Steels Pvt. Ltd.,
India,
Joined Nov 2011
1
10:01 Nov-04-2011
screen castings with defects

Hi,
We are in to manufacturing of Orthopedic Implants by Investment Casting process since last two years. The castings are made from ss316L.
The castings are fully machined and many times we come across the defects seen after machining. Since it is an implant, we donot weld the defect and the castings are rejected.
Please suggest full proof NDT to screen out the castings with defects [seen after machining].
Dhiren Gandhi

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
12:54 Nov-04-2011
Re: screen castings with defects
In Reply to Dhiren Gandhi at 10:01 Nov-04-2011 (Opening).

Hello,
Due to complex geometry, I believe there is no other way than radioscopy.

 
 Reply 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 259

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
259
13:51 Nov-04-2011
Re: screen castings with defects
In Reply to Dhiren Gandhi at 10:01 Nov-04-2011 (Opening).

It is possible to use ultrasonic scanner for this purpose.

Depending on the geometry of the part the required effort can be small or eventually larger, but in most cases such tests are possible.

It is also possible to make a multi-transducer head and measure quite quickly the sound scattered by the object (simplified ultrasonic holography). In many cases this can be the simplest method. With regular object shapes it works even quite good in the air.

If you could send a picture of the raw casting, I would be able to make a more concrete proposal.

 
 Reply 
 
Jack Kleinfeld
Engineering,
Kleinfeld Technical Services, Inc., USA, Joined Feb 2004, 14

Jack Kleinfeld

Engineering,
Kleinfeld Technical Services, Inc.,
USA,
Joined Feb 2004
14
14:12 Nov-04-2011
Re: screen castings with defects
In Reply to Dhiren Gandhi at 10:01 Nov-04-2011 (Opening).

There is a possibility that the defects could be found using infrared thermography.

Are the parts essentially a shaped solid, or do they include voids by design? Are they generally planar in shape or more of a full 3D shape? How thick are they? What type and size of defects are of concern?

If you could send me a few photos of the part and of a defect, I would be glad to get more specific about it.
Jack

 
 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
16:23 Nov-04-2011
Re: screen castings with defects
In Reply to Dhiren Gandhi at 10:01 Nov-04-2011 (Opening).

A combination of NDT methods, qualification of the investment casting process itself to minimize the discontinuities, right use of SQC tools etc. will be helpful. In other words, an integrated approach would be ideal.

We have had good success with qualification of SS investment castings for nuclear applications.

If you need more help, pl. feel free to contact me.

Regards

Swamy
Hyderabad, India

 
 Reply 
 

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