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Technical Discussions
Sunny
Sunny
07:20 Feb-09-2007
UT testing round bars

In round bars as I understand, the defects occur in axial direction. What are the chances of defects in circumferential direction espically near the surface. And for finding such defects, isnt shear wave is the best to be used. I am talking of automated units; no inspection from sides.


    
 
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Terry
Terry
03:15 Mar-14-2007
Re: UT testing round bars
----------- Start Original Message -----------
: In round bars as I understand, the defects occur in axial direction. What are the chances of defects in circumferential direction espically near the surface. And for finding such defects, isnt shear wave is the best to be used. I am talking of automated units; no inspection from sides.
------------ End Original Message ------------

It depends to some degree on how the bars have been processed and the material being inspected. In our rolled bars we perform normal longitudinal wave inspection for internal defects and typically, circumfrential shear wave inspection for the detection of surface related defects, i.e. seams in an axial direction. However, we sometimes also perform an additional axial shear wave inspection to detect roll tears which most likely will occur in the circumfrential direction. For internal discontinuities, the longitudinal wave mode is probably the best inspection method as discontinuities should occur in the direction of grain flow.



    
 
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