ASTM E127-20 PDF

Full title and description

Standard Practice for Fabrication and Control of Flat Bottomed Hole Ultrasonic Standard Reference Blocks (Designation: ASTM E127-20). This practice specifies procedures, fabrication tolerances, and control measures for metal-alloy ultrasonic reference blocks that contain flat bottom holes (FBH) used to check and standardize ultrasonic examination equipment and methods.

Abstract

ASTM E127-20 establishes fabrication and verification practices for flat-bottom-hole (FBH) ultrasonic standard reference blocks used with pulse-echo ultrasonic methods (direct-contact or immersion). It defines standard block sets (Basic, Area-Amplitude, Distance-Amplitude), material and dimensional controls, and verification/testing requirements (notably immersion testing at 5 MHz for the area- and distance-amplitude relationships). The practice incorporates applicable requirements from related ASTM practices and guides to ensure consistent block performance for equipment checks and test standardization.

General information

• Status: Published / Valid (current edition).
• Publication date: Current edition approved December 1, 2020; published January 2021 (Designation E127-20).
• Publisher: ASTM International.
• ICS / categories: 77.040.01 (Testing of metals in general); 77.120.10 (Aluminium and aluminium alloys).
• Edition / version: E127-20 (2020 edition).
• Number of pages: 16 pages.

Scope

This practice covers procedures for fabrication and control of metal-alloy reference blocks containing flat bottom holes (FBH). The blocks are intended for checking the performance of ultrasonic examination instrumentation and search units and for standardization and control of ultrasonic examinations of metal-alloy products. The practice applies to both direct-contact and immersion pulse-echo ultrasonic methods and describes standard block sets for flat-surface sound entry. It prescribes fabrication practices and tolerances but does not define product rejection limits or specific reflector sizes; customer specifications take precedence where conflicts occur.

Key topics and requirements

• Definitions and designation: E127-20, flat bottom hole (FBH) reference blocks and standard set types (Basic, Area‑Amplitude, Distance‑Amplitude).
• Materials: metal-alloy reference blocks (aluminum and other alloys as applicable) and requirements for material selection and preparation.
• Fabrication tolerances and dimensional controls for FBH geometry, surface finish, and block features.
• Verification and control procedures, including immersion testing at 5 MHz to establish area‑amplitude and distance‑amplitude relationships for standard sets.
• Guidance for use with direct-contact and immersion pulse-echo ultrasonic methods and for application to various product forms (plates, bars, billets, etc.).
• Incorporation of requirements from related practices and guides (for example Practice E428 and Guide E1158) to ensure compatibility with prior reference-block methodologies.
• Notes on units (inch‑pound as standard; SI conversions for information) and on the user’s responsibility for applicable safety and regulatory considerations.

Typical use and users

Used by nondestructive testing (NDT) laboratories, ultrasonic equipment manufacturers and calibrators, inspection and quality-control personnel in aerospace, defense, power generation, metallurgy, and manufacturing sectors, and by organizations that maintain ultrasonic test calibration standards. Typical applications include routine instrument checks, transducer verification, establishment of distance- and area-amplitude curves, and procurement/specification of calibrated reference blocks.

Related standards

Commonly referenced ASTM documents and related practices/guides include Practice E428 (fabrication and control of other metal reference blocks), Guide E1158 (material selection and fabrication of reference blocks), Practice E1065 (evaluating ultrasonic search units), Practice E317 (performance characteristics of ultrasonic equipment), and Terminology E1316. The 2020 edition (E127-20) succeeds earlier editions such as E127-19 and E127-19e1.

Keywords

flat bottom hole, FBH, ultrasonic reference block, standard reference block, area-amplitude, distance-amplitude, immersion testing, pulse-echo, direct-contact, calibration, nondestructive testing (NDT), aluminum reference blocks, ultrasonic standardization, E127-20.

FAQ

Q: What is this standard?

A: ASTM E127-20 is a practice that specifies fabrication and control procedures for flat-bottom-hole ultrasonic standard reference blocks used to calibrate and check ultrasonic examination equipment.

Q: What does it cover?

A: It covers fabrication tolerances, material and dimensional controls, verification and testing procedures (including immersion testing at 5 MHz for area- and distance-amplitude relationships), and descriptions of standard block sets used with direct-contact and immersion pulse-echo ultrasonic methods.

Q: Who typically uses it?

A: NDT laboratories, ultrasonic equipment manufacturers and calibrators, inspection personnel in aerospace/defense/industrial sectors, quality-control engineers, and anyone procuring or using calibrated ultrasonic reference blocks.

Q: Is it current or superseded?

A: The current edition is E127-20 (approved December 1, 2020; published January 2021). It replaces earlier editions (for example E127-19 / E127-19e1). Users should confirm any subsequent revisions or work items before relying on it for the latest requirements.

Q: Is it part of a series?

A: It is part of ASTM Committee E07 (Nondestructive Testing) outputs and is closely related to other E07 practices and guides (such as E428 and E1158) that address reference blocks and ultrasonic testing methods.

Q: What are the key keywords?

A: Flat bottom hole (FBH), ultrasonic reference block, area-amplitude, distance-amplitude, immersion testing, pulse-echo, calibration, nondestructive testing (NDT), aluminum, E127-20.