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 compensation is typically performed electronically at multiple angles. Some combinations may tolerate a bit more range and others less but is generally pushing thing past the limit in all cases. We all know that wstm 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 intended for phased-array flaw detection instruments operating in the nominal frequency range of 1 MHz to 20 MHz, but the procedures are zstm to measurements on instruments utilizing significantly higher frequency components.
But I had a hard time to calibrate from 35 to 75 degrees with the radius of the IIW block. Historical Version s – view previous versions of standard.
ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL
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 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.
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. Active view current version of standard.
Note that there are technical limits to ACG, that is, beyond s2491 certain angular range, compensation is not possible. Regards Ed Start Original Message In the description for steering limit it is considered that the limitation is being assessed for a particular application.
Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh! Marc and myself have been discussing astk the ACG recently, so he forwarded this topic to me. Most codes do not use focusing for general weld inspection.
ASTM E TYPE B PHASED ARRAY ASSESSMENT BLOCK, STEEL – NDT
The diagrams in E are examples of how target patterns can be arranged to carry out e491 of the assessments. The wording in this definition does not seem to reflect the true intent of the function. Hi, I am trying to make a phased-array reference block for a specific application. But astj 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 is added to a thread on ACG. Exit point migrations do occur but again, vary, depending on the probe and wedge.
Where acceptance criteria are implied herein they are for example only and sstm subject to more or less restrictive limits imposed by customers and end users controlling documents. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It is to note that it is the same for delay calibration from a radius with a single probe position. 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.
As I understand, ACG is used to compensate the attenuation due to beam steering. Using a Side Drilled Hole may not even be the best option. There are many reasons NOT to use this range, not the least of which there is a large xstm of the beam that is near the first critical angle. 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.
Luc Mauzeroll Start Original Message 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 Just because the software can be used to enter a range of angles is perhaps misleading.
Any clarification will be appreciated! The compensation is typically performed electronically at multiple depths.