where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

521 views
Technical Discussions
George Kim
George Kim
08:08 Mar-18-2008
technical question for specific application

I would like to know if there is an NDT technology that may be able to address a client’s need. The need is to determine the quality of a fused non-magnetic metal coating on a non-magnetic metal substrate. The deposit is sprayed onto the surface (200 to 500 micrometers thick) via thermal spray and fused to form a metallurgical bond by placing the coating/substrate system into a high temperature furnace. The coating is applied onto the ball component (1"OD to 16"OD) of ball valves and hence consists of a sphere with a bore that runs through it. The coating thickness may vary with each part. The client is seeking a means of determining whether there are any hidden flaws, i.e., cracks, pores, insufficient fusion, etc., within the coated parts.


Thank you.




 
 Reply 
 
Michel
NDT Inspector,
consultant, Canada, Joined Sep 2006, 893

Michel

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
893
07:23 Mar-19-2008
Re: technical question for specific application
----------- Start Original Message -----------
: I would like to know if there is an NDT technology that may be able to address a client’s need. The need is to determine the quality of a fused non-magnetic metal coating on a non-magnetic metal substrate. The deposit is sprayed onto the surface (200 to 500 micrometers thick) via thermal spray and fused to form a metallurgical bond by placing the coating/substrate system into a high temperature furnace. The coating is applied onto the ball component (1"OD to 16"OD) of ball valves and hence consists of a sphere with a bore that runs through it. The coating thickness may vary with each part. The client is seeking a means of determining whether there are any hidden flaws, i.e., cracks, pores, insufficient fusion, etc., within the coated parts.
:
: Thank you.

Hi Georges,

At first, I was going to suggest doing UT in immersion. But your coating is so thin, I don't think you could differentiate with the base metal. Since the coating and base metal are nonmagnetic, I would try Eddy Current. I remember doing thickness inspection on Learjet aircraft with this method. In my situation, I had 3 calibration piece of different thicknesses and I would set my instrument at the frequency, gain and phase angle which provided me with the best separation. In your situation, crack and pores maybe detectable, but I'm not so sure about the fusion. You may still have to test for this using UT?

Hope this may be of help to you, Cheerios!!!

Michel

End Original Message ------------




 
 Reply 
 

Product Spotlight

NEW Wheel Type Phased Array Probe

DOPPLER NEW Wheel Type Phased Array Probe, more stable, new tyre makes lesser acoustic attenuation
...
, much lighter makes easier to handle, more slim size, magnetic and mechanical encoder optional etc...more
>

FAAST-PA! OEM Patented phased Array for high speed UT inspection

Multiangle, Multifocus, Multifrequency, Multibeam. Instead of stacking UT electronics and having m
...
any PA probes, FAAST-PA is able to transmit all delay laws within ONE single shot in Real time.
>

Compact NDT inspection-heads for measurements with active thermography

The compact inspection head is suitable for thermographic ndt tasks. The uncooled infrared camera
...
is specially developed for NDI-tasks and offers a thermal sensitivity until now known only from thermal imagers with cooled detector. All required components and functions are integrated into the inspection-head. You will only need an ethernet cable to connect the sensor with the evaluation system.
>

NDT Master Lecturer

In the program both university professors and practitioners will give lectures, which guarantees the
...
oretical depth and practical inside. Academic Director: Prof. Dr. Christian Boller
The following lecturers are not complete: Prof. Tadeusz Stepinski, Prof. Wieslaw Staszewski, Prof. Frank Walther, Prof. Giovanni Bruno, Prof. Gerd Dobmann, Prof. Philippe Guy
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window