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Technical Discussions
Paulo
Paulo
06:44 Sep-14-2007
Phased Array for Stainless Stell welds

Hello people!!!
Does anybody had already tried to do stainless stell weld inspection with phased array??Have any procedure available?
Thank you!

Paulo


    
 
 Reply 
 
Michael Moles †2014 *1948
, Joined ,
08:26 Sep-14-2007
Re: Phased Array for Stainless Stell welds
----------- Start Original Message -----------
: Hello people!!!
: Does anybody had already tried to do stainless stell weld inspection with phased array??Have any procedure available?
: Thank you!
: Paulo
------------ End Original Message ------------

Paulo:
Lot's of companies have inspected stainless steels with phased arrays, and procedures may be available from the right people. if you are looking for contacts, please contact me directly by e-mail. You should also give some specifications, e.g. type of stainless, thickness, expected defects etc.
Yours,
Michael



    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
08:29 Sep-14-2007
Re: Phased Array for Stainless Stell welds
Paulo:
whether the ultrasound is generated by a single element or a phased array probe the issues for "ultrasonic" inspection for austenitic materials remain the same.

You will still need to assess what the best frequency and wave mode (compression or shear) will be to achieve the results you are trying for. Phased arrays may provide interesting and useful options for beam angle, Tandem techniques and TRL methods but they are still subject to the same issues of scatter and absorption as any mechanical wave pulse.
Ed


----------- Start Original Message -----------
: Hello people!!!
: Does anybody had already tried to do stainless stell weld inspection with phased array??Have any procedure available?
: Thank you!
: Paulo
------------ End Original Message ------------




    
 
 Reply 
 
John Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 160

John Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
160
09:11 Sep-14-2007
Re: Phased Array for Stainless Stell welds
----------- Start Original Message -----------
: Hello people!!!
: Does anybody had already tried to do stainless stell weld inspection with phased array??Have any procedure available?
: Thank you!
: Paulo
------------ End Original Message ------------

Some of the conditions that can make ultrasonic evaluation of austenitic stainless steel welds so difficult would not be helped by phased array. Large variations in velcoity and attenuation with changes in direction would cause the phased array to behave quite differently from what would be predicted in more uniform materials. In welds made from one side with one procedure, then back-gouged and the back side done with another procedure, there can be huge differences in acustic properties and a large reflection from the interface. I have sometimes used test specimens with macroetched surfaces and side-driled holes in several locations to painfully sort out an effective technique for manual inspection with several probes. It would be much less difficult to develop a phased array technique in a production environment if it were possible to start working on the inspection as the welding procedures were being developed..



    
 
 Reply 
 

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