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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The wording in this definition does not seem to reflect the true intent of the function. No other units of measurement are included in this standard. Some combinations may tolerate a bit more range and others less but is generally pushing thing past the limit in all cases.
ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL
In the description for steering limit it is considered that the limitation is axtm assessed for a particular application. Ginzel, hello Marc, Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. Let me know if you have a suggestion for better wording and I can prepare the necesary changes to the document. Link to Active This link will always route to the current Active version of the standard. Just because the software can be used to enter a range of angles is perhaps misleading.
You will end up with a distorted S-scan. Active view current version of standard. I would please like to know if there is any restrictions f2491 the surface roughness of a reference block for phased-array application. In fact I do not think that this function awtm compensates for a fixed depth SDH.
Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh! I believe that you both are on the right track, but I would have something to add.
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. But I had a hard time to calibrate from 35 to 75 degrees with the radius of the IIW block.
Let me know what you think! Instead, this would be better addressed using a radius to ensure a constant area reflecting surface. Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations.
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 to Active This link will always route to the current Active version of the standard.
E gives guidance on evaluating performance of phased-array systems. Perhaps surface finish of a block merits a new thread.
The compensation is typically performed electronically at multiple depths. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Regards Ed Start Original Message Historical Version s – view previous versions of standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. Hamid, your question is added to a thread on ACG. I personally would have said something like: Hi, I am trying to make a phased-array reference block for a specific application.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Very interesting topic, I look forward to read your point of view, or from others too.
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. 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 Or it could be as small as mm on a small short wedge.
Most codes do not use focusing for general weld inspection. There is also a concern for focusing. Is it a possibility to still use the radius and move the probe for each angle?
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 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. Typical of a practical application, E states in A2.
I went through ASTM E and the discussions in the forum but I found nothing on the surface roughness of phased-array blocks. 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.
ASTM E TYPE B PHASED ARRAY ASSESSMENT BLOCK, STEEL – NDT
I provided this definition from a list of Phased Array definitions that had been assembled with input from a variety of manufacturers and users. 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. Now the main point I want to bring to your attention is that the exit point moves from a phased-array probe.