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Technical Discussions
Ganeshan
NDT Inspector,
India, Joined Aug 2016, 7

Ganeshan

NDT Inspector,
India,
Joined Aug 2016
7
08:06 Aug-01-2017
Guidance and feasibility for UT - gear teeth

This is Ganeshan.

Is there any standard guidelines for checking gear teeth and pinion shaft gear teeth?

The area we need to scan in the gear has only 2mm width (top of the teeth i.e the flat surface ) and the dental height may vary from 20-40mm .

We trailed a scan with a 4.2/4 dia 10MHZ probe this is the miniature probe we have. We are not sure about the reliability of the inspection.

What probe to use? Is it really feasible to check with UT??
Please guide me..

 
 Reply 
 
Louis
Other,
Eddyfi Technologies, Canada, Joined May 2013, 35

Louis

Other,
Eddyfi Technologies,
Canada,
Joined May 2013
35
14:30 Aug-01-2017
Re: Guidance and feasibility for UT - gear teeth
In Reply to Ganeshan at 08:06 Aug-01-2017 (Opening).

Hello Ganeshan,
There is one standard I know about gear teeth: ASTM E2905
Of course, it may not be suited for your needs (it depends on the flaws you are looking for, among other things) and it is not using UT. Note that depending on your specific application, UT may not be the optimal method, by the way (surface condition, geometry, target flaw and orientation, etc.). Electromagnetic methods may be helpful (eddy current array and/or ACFM - Alternating Current Field Measurement).
Here is the official link for E2905: https://www.astm.org/Standards/E2905.htm
All the best,
Louis

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
02:37 Aug-02-2017
Re: Guidance and feasibility for UT - gear teeth
In Reply to Ganeshan at 08:06 Aug-01-2017 (Opening).


Dear Ganeshan,

Generally UT is done on gear blanks before cutting the teeth.

After cutting the gear teeth normally PT, MT and ET are done. These tests are done after the completion of carburization/nitriding hardening process.

Same tests are done for gears (teeth) during service inspections also.

It is very rare to have internal cracks underneath gear teeth. All the cracks start from outside surface and near the stress concentration zones. Cracks also start near the junction of hardened zone

I agree with Mr.Louis and you may consult the standard for carrying out the tests.

In case you find some defects (by the surface testing methods) you may develop a special UT procedure for finding the defect orientation, depth etc. ( if such a specific requirement is made by the customer)

Best wishes

P V SASTRY

 
 Reply 
 

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