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Technical Discussions
Sunny
Sunny
05:51 Jul-13-2006
Round bar immersion Inspection

Could anyone explain what is the best way these days to to immersion testing on round bars as there are different scan patterns like one is helical and another is bar rotates and transducer is ondexes in linear direction. Which is good? and what really is helical scan?

Thanks


    
 
 
Fred Beck / Tac Tecnical instrument corp.
Fred Beck / Tac Tecnical instrument corp.
01:24 Jul-13-2006
Re: Round bar immersion Inspection
----------- Start Original Message -----------
: Could anyone explain what is the best way these days to to immersion testing on round bars as there are different scan patterns like one is helical and another is bar rotates and transducer is ondexes in linear direction. Which is good? and what really is helical scan?
: Thanks

Tactic has been manufacturing tube and bar inspection systems since 1962. We have several publications which explan the various aspects of different bar inspection methods. please email me your mailing address and I will be glad to send them to you.

Fred Beck
------------ End Original Message ------------




    
 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 519

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
519
01:42 Jul-13-2006
Re: Round bar immersion Inspection
There are three approaches to creating a helical scan. (which just means that the probe covers the bar in a helical pattern, i.e. like a screw thread)

The Bar is on a skewed conveyer system with a fixed probe assembly. I.e. the bar rotates and moves forward evenly.
This works well for large tubes, (up to maybe 200mm diameter, maybe 10-20 m long) as part of an in-line conveyor system. The conveyor needs to be well set up and large, but, being fixed, the ultrasonic set up, is relatively simple to arrange.

second method is to have a rotating test head, through which the bar is moved. The test head is expensive, and setup is critical, but it can be fast
and very effective. It is the only way to test continuous product, i.e. coiled rod or wire.

Lastly you can rotate the bar and scan the probe along. This is most typically used for small bars, in an immersion tank. Typically there is much less vibration, so it works well for small critcal parts, which need to be tested to a high sensitivity. It is normally used for small batches, rather than high volume production.

Which of these works best depends on many factors, there is no one best way.

Joe


----------- Start Original Message -----------
: Could anyone explain what is the best way these days to to immersion testing on round bars as there are different scan patterns like one is helical and another is bar rotates and transducer is ondexes in linear direction. Which is good? and what really is helical scan?
: Thanks
------------ End Original Message ------------




    
 
 

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