V-1 Calibration Block

The V-1 Calibration Block is used for calibrating ultrasonic flaw detection equipment in both laboratory and on-site conditions. it includes a 100mm radius, 1.5mm and 50.0mm holes, engraved reference mark scales, and slots at the zero point which provide calibrating signals at intervals of 100mm range. In accordance with British standard BS 2704 Block A2 Mod. 1,  DIN 54-120, and ISO 2400.

Dimensions: 300mm*100mm*25mm
Engineering plastics storage cases
Net weight: 5.0kg
Gross weight: about 6.5kg

We can customize calibration blocks based on customer’s requirements.

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What is a Calibration Block?

When testing objects using ultrasonic tests, calibration blocks are well-accepted standards to carry out this test. However, the shape, size, and form of the item undergoing tests will determine the calibration block type to employ since calibration blocks are in different shapes and sizes.

When choosing the calibration block for ultrasonic testing, certain features should come to mind. For instance, the object undergoing the test and the calibration block should be of similar materials.

Also, the error induced by the calibration block should adequately depict the error under the test consideration.

Some examples of standard calibration blocks based on their different standards and what they measure can include Universal Calibration Block Unit (CBU) for testing transducers and shear wave point of emission.

Other calibration blocks can be Velocity blocks, IOW calibration blocks, FB frequency calibration blocks, and ASME Calibration Test blocks.

All these calibration blocks and many others not mentioned are the test standards employed for specific uses. This criterion is necessary to get precise and accurate test results.

What is the IIW Block?

Different classes of weighted standards existed in times past. The international authorities seem to be doing a great job with the calibration of weighted standards for weld testing.

The calibration with one of the highest accuracies is the International Institute of welding calibration blocks, also known as IIW Blocks.

This IIW block forms what measures search units’ operational characteristics, including angle-beam and contact straight-beam.

The material for the manufacture of IIW block is often low carbon steel. Hence, various materials have been used to produce IIW blocks. This production has resulted in wide-ranging ultrasonic characteristics even though it uses strict mechanical tolerances.

Also, because of the different types of materials employed in producing the IIW Blocks, different attenuation and acoustic velocities will exist.

Other factors such as heat treatment, texture, rolling direction, and cast material (either plate or billet) can further affect the acoustic parameters of the IIW Blocks.

There have been different ultrasonic test results generated by various users of the IIW Block. However, ascertaining the extent of variability of these results and their effects is still in the works. Setting a tolerance limit for acoustic parameters is, therefore, an essential right step.

What is a Calibration Block in Ultrasonic Testing?

Ultrasonic testing is a form of non-destructive examination to assess errors and flaws that may exist within an object, including welding faults.

During this process, a calibration block is a standard against which to evaluate these inaccuracies.

Calibration blocks can ascertain the ultrasonic oscillation’s index point and the ultrasonic x-value within an acceptable error limit of +0.5mm. Also, it can establish the resolution facilities of probes using ultrasonic straight beams.

Other capacities of the calibration block in ultrasonic testing include the confirmation of probe angle within limits of + 1 degree for ultrasonic oscillation and ascertaining the horizontal sweep linearity.

Lastly, calibration blocks can confirm the non-testing zones, also known as dead zones, during probes using a straight beam.

However, the calibration block characteristics that make it useful for ultrasonic testing include the low carbon steel material’s low attenuation coefficient, weight, geometric dimensions, and longitudinal sound wave velocity.