Technical Discussions: Re: Resonance testing

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Re: Resonance testing
Posted by: Godfrey Hands , E-mail: godfrey@quasarintl.com, on December 30, 2003 at 15:58 :
In Reply to: Resonance testing posted by : S S Ananthan , E-mail: ananreva@yahoo.com, on December 27, 2003 at 18:02 :
----------- Start Original Message -----------
: HEllo,
: I understand that there is a method called resonance testing which uses the natural frequency of a job to identfy whether it has any defect by comapring the natural frfequency of a defect free job.
: Is it used in detecting defects in welding ? Any specific experience ? Can the method be used for detecting stiffness of structures ?
: S S Ananthan
------------ End Original Message ------------
Dear S.S. Ananthan,
You are right. Resonance testing is widely used in inspecting components for defects, and the principal is to compare the resonances from good pieces to those that you are inspecting.
When you have a defective part, then some of the resonances will change.
However, many other factors change the resonances by an amount equal to the change from a small defect, such as temperature, dimensions, heat treatment etc. and this limits the sensitivity in many types of simple resonance testing.
Quasar International have developed a technique that compensates for these acceptable variations and increases the sensitivity of the test to a practical one again.
This can be economically applied in mass produced components to detect defects at production rates. However, component weights within the range 20 grams to 20 Kg are normally the limits that we have experiences with.
Within welded parts, we have quite some experience on electron beam welded joints between shafts and gears for the automotive industry.
Please contact me with more details of your application, and I will provide you with some information specific to your application.
You can also look on the Quasar International web site at www.Quasarintl.com
Regards,
Godfrey Hands

Follow Ups:

Re: Resonance testing Wolfgang Bisle 15:06 Jan-05-2004 (7)

Re: Resonance testing M. Kim Johnson 18:40 Jan-05-2004 (6)

Re: Resonance testing Wolfgang Bisle 19:17 Jan-06-2004 (5)

Re: Resonance testing M. Kim Johnson 00:49 Jan-07-2004 (4)

Re: Resonance testing Wolfgang Bisle 16:40 Jan-07-2004 (3)

Re: Resonance testing S S ANANTHAN 16:01 Jan-13-2004 (2)

As-Sal#226;mu 'Alaikum Halema Hamza 00:14 Nov-09-2006 (0)

As-Sal#226;mu 'Alaikum Halema Hamza 00:13 Nov-09-2006 (0)

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----------- Start Original Message ----------- : : HEllo, : : I understand that there is a method called resonance testing which uses the natural frequency of a job to identfy whether it has any defect by comapring the natural frfequency of a defect free job. : : Is it used in detecting defects in welding ? Any specific experience ? Can the method be used for detecting stiffness of structures ? : : S S Ananthan : Dear S.S. Ananthan, : You are right. Resonance testing is widely used in inspecting components for defects, and the principal is to compare the resonances from good pieces to those that you are inspecting. : When you have a defective part, then some of the resonances will change. : However, many other factors change the resonances by an amount equal to the change from a small defect, such as temperature, dimensions, heat treatment etc. and this limits the sensitivity in many types of simple resonance testing. : Quasar International have developed a technique that compensates for these acceptable variations and increases the sensitivity of the test to a practical one again. : This can be economically applied in mass produced components to detect defects at production rates. However, component weights within the range 20 grams to 20 Kg are normally the limits that we have experiences with. : Within welded parts, we have quite some experience on electron beam welded joints between shafts and gears for the automotive industry. : Please contact me with more details of your application, and I will provide you with some information specific to your application. : You can also look on the Quasar International web site at www.Quasarintl.com : Regards, : Godfrey Hands ------------ End Original Message ------------

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