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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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.
Hamid, your question aztm added to a thread on ACG. 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. 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 guide is not intended to e2419 used as a substitute for calibration or standardization of an instrument or system to inspect any given material.
It is as you stated, to compensate for 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 asm in wedge-path. In fact you are still generating some compression mode at this angle.
Or it could be as small as mm on a small short wedge. Perhaps surface finish of a block merits a new thread.
Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. Aastm 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. I would please like to know if there is any restrictions on the surface roughness of a reference block for phased-array application.
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. We all know that we are losing amplitude at higher and lower angle, but I wondered why I ast easily do it with a side-drilled hole at constant depth. Active view current version of standard. 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.
No other units of measurement are included in this standard. Just because the software can be used to enter a range of angles is perhaps misleading. Is it a possibility to still use the radius and move the probe for each angle?
Instead, this would be better addressed using a radius to ensure a wstm area reflecting surface. 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 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.
There is also a concern for focusing. Any clarification will be appreciated! 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. Link s2491 Active This link will always route to the current Active version of the e24991. It is not intended to define performance and acceptance criteria, but rather to provide data from which such criteria may be established.
E gives guidance on evaluating performance of phased-array systems.
This could be 16mm for a long soudpath in a wedge over the range you indicated! Hi, I am trying to make a phased-array reference block for a specific application. In fact I do not think that this function even compensates for a fixed depth SDH.
Very interesting topic, I look forward to read your point of view, or from others too. Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh! 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. The compensation is typically performed electronically at multiple depths.
All or portions of the guide may be used as determined by the user. I went through ASTM E and the discussions in the forum but I found nothing on the surface roughness of phased-array blocks. Using a Side Drilled Hole may not even be the best option. Regards Ed Start Original Message aatm Ginzel, hello Marc, Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me.
I have noticed the same thing that Marc astmm when I calibrated using a side-drilled hole at constant depth, so I turned to the radius. There are many reasons Ast to use this range, not the least of which there is a large component of the beam that is near the first critical angle.
Let me know what you think! I believe that you both are on the right track, but I would have something to add.
But there are far too many variables for the manufacturer of probes and instruments to try to look after these limitations and in the end the verification of suitability is had by looking at the results on targets like those suggested in E But I had a hard time to calibrate from 35 to 75 degrees with the radius of the IIW block.
Most codes do not use focusing for general weld inspection. As I understand, ACG is used to compensate the attenuation due to beam steering. Let me know if you have a suggestion for better wording and I can prepare the necesary changes to the document. Historical Version s – view previous versions of standard.
Referenced Documents purchase separately The documents w2491 below are referenced within the subject standard but are not provided as part of the standard. In the description for steering limit it is considered that the limitation is being assessed for a particular application. Now the main point I want to bring to your attention is that the exit point moves from a phased-array probe.
You will end up with a distorted S-scan. Link to Active This link will always route to the current Active version of the standard. Typical of a practical application, E states asfm A2.