NM01X0000017

The V-1 Metric Block, made from 1018 Steel, is a fundamental calibration standard widely used in ultrasonic testing (UT) for a variety of purposes. Adhering to metric specifications, often in accordance with standards such as BS 2704 (and commonly referred to as the IIW V-1 block), this block is an essential tool for ultrasonic technicians.

Constructed from 1018 steel, a low-carbon steel alloy known for its consistent acoustic properties and good machinability, the V-1 Metric Block features a specific geometry designed to facilitate several calibration and verification procedures.

Key applications of the V-1 Metric Block include:

• Calibration of Distance Settings: It allows for accurate calibration of the time base or distance settings on ultrasonic flaw detectors for both transverse (shear) waves and longitudinal waves.

• Sound Beam Index Point Determination: The block's features aid in locating the exit point or index point of the sound beam from angle beam transducers.

• Refracted Angle Verification: Technicians can use the block to verify the actual refracted angle of the ultrasonic beam as it enters the test material via an angle beam wedge.

• Resolution and Sensitivity Checks: The block's reflectors enable the evaluation of the resolution capabilities and sensitivity levels of angle beam transducers and ultrasonic instruments.

• Angle Beam Characterization: It is used for angle beam plotting and assessing the beam divergence characteristics of shear wave transducers.

The typical geometric features of a V-1 Metric Block include:

• A defined radius (commonly 100 mm).

• One or more precisely drilled side-drilled holes (often 3 mm and 50 mm in diameter, though configurations can vary).

• Engraved scales or reference markings to assist in measurements and alignment.

• Some versions may include optional slots at the zero reference point to provide calibration signals at specific path distances (e.g., 100 mm).