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 -
489 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, 848

Michel

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
848
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! The PragmaPro Instrument Platform

The PragmaPro is based on a modular cartridge technology and supports various NDT instrument modal
...
ities such as UT, PAUT, ECT and many more. This new platform is based on a machined, powder-coated aluminum frame for shock-proofness, best sealing qualities and maximum heat dissipation. This is practical to extend the outdoor temperature range and/or to extend the power injected in the transducers. The PragmaPro is aiming at a very wide range of applications, such as weld scanning, corrosion mapping and composite testing.
>

High-end Ultrasonic Flaw Detector with 32:128PR PAUT and 2-ch TOFD: SyncScan 2

SIUI’s newly launched SyncScan 2, is a high-end ultrasonic flaw detector with 32:128PR PAUT and
...
2-ch TOFD, which can maximize your efficiency for PA and TOFD. ● Support PA/TOFD/UT ● 32-ch PA is more suitable for inspection on extra-thick wall and high-attenuation material. ● 32-ch PA and 2-ch TOFD work simultaneously. ● Support PR mode for corrosion inspection.
>

XRHRobotStar

In high volume industries like automotive the requirement for a hundred percent X-ray inspection c
...
reates a bottleneck in the production. The XRHRobotStar is a fully Automated Defect Recognition (ADR) capable robot-system that allows an ultra-fast in-line inspection.
>

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

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