ASTM E2491 PDF

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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Let me know what you think! The wording in this definition does not seem to reflect the true intent of the function. 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.

Just because the software can be used to enter a range of angles is perhaps misleading. I provided this definition from a list of Phased Array definitions that had been assembled with input from a variety of manufacturers and users.

Ginzel, hello Marc, Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me.

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. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Finally, not to show things worst than they are. Where acceptance criteria are implied herein they are for example only and are subject to more or less restrictive limits imposed by customers and end users controlling documents.

ASTM E TYPE B PHASED ARRAY ASSESSMENT BLOCK, STEEL – NDT

There is also a concern for focusing. Instead, this would be asgm addressed using a radius to ensure a constant area reflecting surface. Active view current version of standard. Instrument characteristics measured in accordance with this guide are asttm in terms that relate to their potential usefulness for ultrasonic examinations.

Typical of a practical application, E states in A2. Perhaps surface finish of a block merits a new thread. Is it a possibility to still use the radius and move the probe for each angle?

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ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL

Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh! It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

We all know that we are losing amplitude at higher and lower angle, but I wondered why I could easily do it with a side-drilled hole at constant depth. Hi, I am trying to make a phased-array reference block for a specific application. Historical Version s – view previous versions of standard. Now the main point I want to bring to your attention is that the exit point moves from a phased-array probe. Link to Active This link will always route to the current Active version of the standard.

Very interesting topic, I look forward to read your point of view, or from others too.

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. All or portions of the w2491 may be used as determined by the user. Luc Mauzeroll Start Original Message It is as you stated, to compensate for the effect of steering which is effectively for echo-transmittance loss with s2491 angle to some extent there is the added ee2491 for the slight change in wedge-path.

Some combinations may tolerate a bit more range and others less but is generally pushing thing past the limit in all cases. Most codes do not use focusing for general weld inspection. Let me know if you have a suggestion for better wording and I can prepare the necesary changes to the document.

Other electronic instrument characteristics in phased-array units are similar to non-phased-array units and may be measured as described in Guide E or E Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are ashm provided as part of the standard. You will end up with a distorted S-scan.

The compensation is typically performed electronically at multiple depths. But this too focusing 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. Note that there are technical limits to ACG, that is, beyond a certain angular range, compensation is not possible.

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It is intended for phased-array flaw detection instruments operating in the nominal frequency range of 1 MHz to 20 MHz, but the procedures are applicable to measurements on instruments utilizing significantly higher frequency components.

Link to Active Asm link will always route to the current Active version of the standard. In fact you are still generating some compression mode at this angle.

Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations. In the description for steering limit it is w2491 that the limitation is being assessed for a particular application.

As I understand, ACG is used to compensate the attenuation due to beam steering. No other units of measurement are included in adtm standard. The compensation is typically performed electronically at multiple angles. Any clarification will be appreciated! I believe that you both are on the right track, but I would have something to add. Hamid, your question is added to a thread on ACG.

This guide is asttm intended to be used as a substitute for sstm or standardization of an instrument or system to inspect any given material. I went through ASTM E and the discussions in the forum but I found nothing on the surface roughness of phased-array blocks. Ast, Ed Start Original Message I have noticed the same thing that Marc did when I calibrated using a side-drilled hole at constant depth, so I turned to the radius.

I measured amplitudes from 1.

Or maybe the definition implicitly includes the TCG because the two can’t live together when doing S-scan calibration. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.