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.
|Published (Last):||26 December 2004|
|PDF File Size:||14.5 Mb|
|ePub File Size:||4.10 Mb|
|Price:||Free* [*Free Regsitration Required]|
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.
In fact I do not think that this function even compensates for a fixed depth SDH.
ASTM E TYPE B PHASED ARRAY ASSESSMENT BLOCK, STEEL – NDT
The compensation is typically performed electronically at multiple depths. I asgm noticed the same thing that Marc did when E2419 calibrated using e491 side-drilled hole at constant depth, so I turned to the radius. 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 personally would have said something like: 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 angles. Finally, not to show things worst than they are. Using w2491 Side Drilled Hole may not even be the best option. In fact you are still generating some compression mode at this angle. Some combinations may tolerate a bit more range and others less but is generally pushing thing past the limit in all cases.
Is it a possibility to still use the radius and move the probe for each angle? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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. As I understand, ACG is used to compensate the attenuation due to beam steering. 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!
In the description for steering limit it is considered that the limitation is being assessed for a particular application. Just because the software can be used to enter a range of angles is perhaps misleading. Or maybe the definition implicitly includes the TCG because the two can’t live together when doing S-scan calibration.
Ginzel, hello Marc, Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. This standard does not purport to address all of the safety concerns, if any, associated with its use. Exit point migrations do occur but again, vary, depending on the probe and wedge.
The wording in this definition does not seem to reflect the true intent of the function. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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. It is not intended to define performance and acceptance criteria, but rather to provide data from which such criteria may be established. Let me know if you have a suggestion for better wording and I can prepare the necesary changes to the document.
Marc and myself have been discussing about the ACG recently, so he asstm this topic to me.
This guide qstm not intended to be used as a substitute for calibration or standardization of an instrument or system to inspect any given material. Similarly, at the upper end of your range the divergence is causing a large portion of signal astmm mode convert to Rayleigh!
Let me know what you think! Any clarification will be appreciated! But I had a hard time to calibrate from 35 to 75 degrees with the radius of the IIW block. Hamid, your question is added to a thread on ACG. Note that there are technical limits to ACG, that is, beyond a certain angular range, compensation is not possible. 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.
Most codes do not use focusing for general weld inspection. Other electronic instrument characteristics in phased-array units are similar to non-phased-array units and may be measured as described in E or E Typical of a practical application, E states in A2.
ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL
It is to note that it is the same for delay calibration from a radius with a single probe position. 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 The diagrams in E are examples of how target patterns can be arranged to carry out some of the assessments.
Instrument ee2491 measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations. I would please like to know if there is any restrictions on the surface roughness of a reference block for phased-array application.