ISO 2400-1972 rus PDF

Full title and description

ISO 2400:1972 — Welds in steel — Reference block for the calibration of equipment for ultrasonic examination. This International Standard specifies the material and the exact dimensions of a steel reference block intended for setting up and checking ultrasonic examination equipment used on welded steel joints; dimensional tolerances are tight (0,1 mm) to ensure repeatable calibration.

Abstract

ISO 2400:1972 defines a reference (calibration) block geometry and material for ultrasonic inspection of welds in steel. The block is intended as a physical artefact to set probe angles, determine sound path and velocity, and verify equipment sensitivity and time-base settings for manual ultrasonic testing of welded joints. The 1972 edition has been withdrawn and later revised by subsequent editions.

General information

• Status: Withdrawn
• Publication date: June 1972 (Edition 1)
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 25.160.40 (Welded joints and welds)
• Edition / version: Edition 1 (1972)
• Number of pages: 1 (as published in 1972)

Scope

This standard specifies the material, shape and precise dimensions of a steel reference block to be used for calibration, setting and verification of ultrasonic testing equipment applied to welded steel joints. It is intended for manual ultrasonic testing and covers the features of the block required to check straight-beam and angled-beam probes, time-base/sound-path calibration, and to establish a reproducible sensitivity reference.

Key topics and requirements

• Definition of the reference block geometry and nominal dimensions required for calibration tasks.
• Specification of block material (steel) and physical properties relevant to ultrasonic wave propagation.
• Tolerances on all critical dimensions (specified as 0,1 mm in the 1972 text) to ensure repeatability.
• Features for probe positioning and angle-setting used to calibrate straight-beam and angle-beam transducers.
• Requirements supporting verification of time-base (distance/velocity) and equipment sensitivity.

Typical use and users

Used by nondestructive testing (NDT) technicians, welding inspectors, calibration laboratories and manufacturers of ultrasonic test equipment. Typical applications include initial set-up of ultrasonic flaw detectors, periodic verification of instrument performance, training of operators and quality assurance checks on weld inspection procedures.

Related standards

This 1972 edition was later revised by ISO 2400:2012 (Edition 2, September 2012) and the series continued with ISO 2400:2025 (Edition 3, March 2025). Relevant related documents and national/adopted versions include EN/EN‑ISO adoptions and various national calibration-block specifications and guidance documents used in nondestructive testing practice (for example national variants and related NDT standards and guidance on ultrasonic calibration blocks and weld testing procedures).

Keywords

ultrasonic testing, calibration block, reference block, welds in steel, nondestructive testing (NDT), probe angle, time-base calibration, sensitivity verification

FAQ

Q: What is this standard?

A: ISO 2400:1972 is an International Standard that defined the material and dimensions of a steel reference (calibration) block used for calibrating ultrasonic inspection equipment for welded steel joints.

Q: What does it cover?

A: It covers the physical form, key dimensions and tolerances of a reference block that allows operators to set probe angles, establish sound velocity/time‑base, and verify the sensitivity and basic performance of manual ultrasonic testing equipment applied to weld inspection.

Q: Who typically uses it?

A: Nondestructive testing technicians, welding inspectors, equipment calibration labs, training organizations and manufacturers of ultrasonic inspection equipment use the calibration block defined by this standard.

Q: Is it current or superseded?

A: The 1972 edition is withdrawn. The ISO 2400 series has been revised (notably by ISO 2400:2012) and the standard was further updated with a 2025 edition; users should refer to the latest edition (ISO 2400:2025) for current requirements and practice.

Q: Is it part of a series?

A: Yes. ISO 2400 has later editions and related documents covering calibration blocks and ultrasonic-testing practices; national and regional adoptions (EN/ISO, national variants) and companion NDT standards complement it.

Q: What are the key keywords?

A: Ultrasonic testing; calibration block; reference block; weld inspection; steel welds; nondestructive testing; probe angle; time‑base; sensitivity verification.