This standard is issued under the fixed designation E; the number 1 This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc-. Originally contact ASTM Customer Service at [email protected] For Annual Book of ASTM approved in Last previous edition approved in as E Buy ASTM E Standard Guide for Evaluating Performance Characteristics of Phased-Array Ultrasonic Examination Instruments and Systems from SAI.
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Link to Active This link will always route to the current Active version of the standard. Hamid, your question is added to a thread on ACG.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory ast prior to use. Luc Mauzeroll Start Original Message This guide is not intended to be used as a substitute for calibration or standardization of an instrument or system to inspect any given material.
Now the main point I want to bring to your attention is that the exit point moves from a phased-array probe.
I thought TCG was applied at multiple depth to compensate for the attenuation due to the material and ACG at multiple angles to compensate for beam steering. I personally would have said something like: The compensation is typically performed electronically at multiple depths. Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh!
Ginzel, hello Marc, Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. aastm
Re: Question about ASTM E
It is as you stated, to compensate axtm the effect of steering which is effectively for echo-transmittance loss with increasing angle to some extent there is the added compensation for the slight change in wedge-path.
This could be 16mm for a long soudpath in a wedge over the range you indicated! There are many reasons NOT to use this range, not the least of which there is a large component of the beam that is near the first critical angle. Historical Version s – view previous versions of standard. Hi, I am trying to make a phased-array reference block for a specific application.
Regards Ed Start Original Message I believe that you both are on the right track, but I would have something to add.
This means that if you try to calibrate from a single position, the beam will hit the radius penpendicularly at only one angle and the effect is going to be worst at higher and lower angles. In fact I do not think that this function even compensates for a fixed depth SDH. Perhaps surface finish of a block merits a new thread.
E24991 codes do not use focusing for general weld inspection. It is to note that it is the same for delay calibration from a radius with a single probe position. Let me know what you think!
ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL
In the description for steering limit it is considered that the limitation is being assessed for a particular application. Very interesting topic, I look forward to read your point of view, or from others too. In fact you are still generating some compression mode at this angle. Instead, this would be better addressed using a radius to ensure a constant area reflecting surface.
But this too astj will have a significant effect on the ability to calibrate for a consistent sensitivity over a range of angles the more you focus theless you are likely to maintain sensitivity with steering. The wording in this definition does not seem to reflect the true intent of the function.
The diagrams in E are examples of how target patterns can be arranged to carry out some of the assessments. Any clarification will be appreciated! I provided this definition from a list of Phased Array definitions that had been assembled with input from a variety of manufacturers and users.
This standard does not purport to address all of the safety concerns, if any, associated with its use. As I understand, ACG is used to compensate the attenuation due to beam steering.
I measured amplitudes from 1. The compensation is typically performed electronically at multiple angles.
All or portions of the guide may be used as determined by the user. Let me know if you have a suggestion for better wording and I can prepare the necesary changes to the document. Just because the software can be used to enter a range of angles is perhaps misleading.
ASTM E TYPE B PHASED ARRAY ASSESSMENT BLOCK, STEEL – NDT
Using a Side Drilled Hole may not even be the best option. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Is it a possibility to still use the radius and move the probe for each angle?