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Calibration Block

NDT-KITS is your reliable calibration block supplier in China. Come and get the best price of calibration block!

  • We supply standard blocks, reference blocks and customized blocks, in total more than 100 models
  • We supply calibration blocks to SGS since 2011
  • We provide OEM service and quick delivery
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4 Step Block
5 Step Block
10-Step Block
V-1 Calibration Block
V-2 Calibration Block
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Calibration Block for Sale

NDT-KITS can supply many kinds of standard calibration blocks and customized blocks. with our high-level manufacture process and advanced equipment such as Mitsubishi EDM machine, high-accuracy optical jig borer, digital lathe and miller, high-accuracy horizontal grinding machine, exterior and interior round grinding machines, we produced many blocks with high quality. By using Electrical Discharge Machining (EDM) technology, we can process 0.13 mm notch.

Our blocks are widely used in aerospace, automotive, petrochemical, power generation and other industry. And we are supplier of SGS to supply them calibration blocks.

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Why Global Clients Choose Us?

40 Years of Expertise

We have 40 years of experience in the professional production of ultrasonic flaw detectors, an annual output of more than 10,00 ultrasonic flaw detectors, thickness gauges, ultrasonic probes and calibration blocks.

Talented Engineers and support team

As of September 2021, we have a total of 125 employees, including nearly 45 professional and technical workers who are masters or doctorate degree holders.

Advanced production equipment

We have Complete machining workshop, CNC, CNC machine tools, and more than 50 other types of processing equipment,to ensure high-precision product parts.

Excellent After-Sales Service

We provided excellent after-sales service, including fast delivery, online training,  immediate feedback of trouble shotting.

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Customers Good Feedback:

Good Words From Good People

The NDT-KITS calibration test block is a must-have in every testing site. They do not cut corners, and quality control is of the highest importance. Previously, I had exclusively purchased calibration blocks from the United States or Germany but NDT-KITS has changed my view as a quality and dependable Chinese company.
Roman SimonSGS corporation
Roman Simon
NDT-KITS has you covered if you need to know what an inch (or mm) is on your measurement instruments. For a calibration block, it is really nicely packed and moderately priced. Just keep in mind that when it comes to 0.11 or 0.001 inch, the measurement accuracy does matter.
Max BrienRyan Companies
Max Brien
The packaging provided by NDT-KITs is ideal for this calibration test block. The block itself is quite exact in terms of size calibration. It's what I use to calibrate ultrasonic flaw detector or thickness gauge. NDT-KITS' production quality is excellent, and they ship quickly. I would happily suggest this provider as a great source for ndt calibration blocks.
Wyatt Skywalker Clark Group
Wyatt Skywalker
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Calibration Block: The Ultimate Guide

Table of Contents

 

Have you ever asked yourself why calibration blocks are so crucial in ultrasonic testing? 

The ability of ultrasonic flaw detectors to accurately identify flaws within a component is strongly tied to the consistency in periodic calibration that the flaw detector has undergone. Consequently, the benefits of carrying out regular calibration are numerous. 

However, since the nature of the defect suspected and the geometry of the test samples determine the type of flaw detector required, it follows that the kind of calibration and reference standards to employ will be closely related to the geometry of the test sample as well as the specific testing requirements. 

This guide gives you all the information you need to know about ut calibration blocks. Without further ado, let’s dive in.

I. What is a Calibration Block for Ultrasonic Testing? 

When it comes to applications of ultrasonic testing, reference standards, and calibration are of utmost importance as they serve as a measuring yardstick to ascertain the level of accuracy of flaw detecting devices. Calibration evaluates the precision of the quality assessment tool used for inspection and identifying flaws within a given component. It’s no surprise that cal blocks are used this way since the level of precision of your flaw detecting tool determines the level of result accuracy you can expect per inspection. 

Calibration is part of an inspection technician’s daily, weekly, monthly, and yearly routine, as failing to carry out periodic calibration can accumulate errors in the instrument for every inspection undertaken.

 

Ultrasonic blocks

 

The calibration of ultrasonic flaw detectors often depends on the nature of inspection specified for the flaw detector since most UT equipment is versatile and can be used for varied applications. Naturally, calibrating UT equipment will involve setting the transducer, equipment setting, and test setup to guarantee optimum precision and accuracy of test results. 

Also, reference standards are equally essential, seeing that they validate the result of the equipment as consistent with established parameters of accuracy. Nonetheless, both calibration and reference standards come in various shapes and sizes to match the shape and size of the test sample and the specific testing application required. 

Still, both test material and the reference standard blocks must be made of the same materials. The created sample flaw must be closely similar to the fundamental flaw intended for testing.

II. How Many Types of Ultrasonic Calibration Blocks are there in Ultrasonic Testing?

Like most calibration tools, ut calibration blocks help ascertain the accuracy of flaw detectors and ensure their margin of error is within tolerable limits. However, calibration test blocks can include the following based on their specific uses, material, shape, and size of the tested object.

 

  • IIW type blocks

The International Institute of Welding or IIW type blocks are made using various materials, and its dimensions use imperial units of measurement. However, they can be used for both regular incident inspection and angle beam calibration. Additionally, they often come in three variants, including IIW US-1, IIW US-2, and IIW mini-type blocks. 

 

  • AWS resolution calibration blocks

The resolution calibration or RC blocks is the cal block for determining the resolution of angle beam probes following the American Welding Society (AWS) and American Association of State Highway Transport Officials (AASHTO). Essentially, the AWS RC block comes with index markers at 45-, 60-, and 70-degree angle beam engraved in it. 

 

  • Distance/Sensitivity DS blocks

DS block conforms with the AWS and AASHTO standards for evaluating the horizontal linearity and the accuracy of the decibels as specified by these standard bodies. 

 

  • ASTM distance/area-amplitude blocks

This calibration block often comes as a set of ten correctional blocks made of either steel, aluminum, or titanium drilled with a plug hole at the flat bottom side. These holes are of varying diameters for the ten sets of blocks. Other similar blocks include ASTM distance-amplitude blocks and ASTM area-amplitude blocks.   

 

➤ Related Article: Types of Ultrasonic Calibration Block

➤ Related Article: Top 7 Ultrasonic Calibration Block Manufacturers

III. What is Ultrasonic Calibration Block V1?

V1 block is used to calibrate ultrasonic flaw detectors when conducting a quality inspection of welded joints with ultrasonic testing. Ordinarily, they have an error accuracy of ± 0.5 mm when determining the index points of ultrasonic X-values and ultrasonic oscillations. However, they are also effective when choosing non-testing zones and resolution capacity for straight beams and the horizontal sweep linearity of UT flaw detectors. 

On the other hand, its specification includes 4.8kg weight, fine-grained low carbon steel material, and a low attenuation coefficient. Additionally, its longitudinal and shear wave velocities are 5920 ±30m/s and 2670 ±100 m/s, respectively, for material a frequency of 5.0 MHz and temperature of 20±5 degrees Celsius.

IV. What is Ultrasonic Calibration Block V2?

Ultrasonic calibration block V2 is used in calibrating flaw detection devices, especially for welding inspection and quality assessment. Naturally, its specification comes with longitudinal wave velocities of 5890 and 5950 m/s for the block material frequency of 5MHz and a temperature ranging between 15 and 25 degrees Celsius. Also, it has a shear wave velocity of 3240 and 3270 m/s for the block material frequency of 5MHz and a temperature ranging between 15 and 25 degrees Celsius.

Essentially, a calibration block V2 calibrates flaw detectors with sound velocity while operating with straight beam or angle beam probes. Also, it enables the determination of the probe angle of sound waves in steel.

V. What is Distance Amplitude Correction (DAC)?

When you examine the acoustic signals received by a transducer, you quickly realize that the distance of the sound signals from the transducers naturally determines the amplitude of the signal received by the transducers even though the sounds are coming from the same reflective surface. Therefore, to graphically represent these differences as reference level sensitivity on an A-scan display, a Distance Amplitude Correlation (DAC) methodology comes in handy. 

Similar discontinuities reflect signals in specific ways that make DAC the most suitable method for evaluating them. However, correlating signal attenuation as a function of depth must first be settled. Nonetheless, DAC always gives tolerance for amplitude loss with time changes represented on the A-scan graphically. Still, specific instruments may enable this sort of representation electronically with almost equivalent results. 

While transducer size and frequencies still determine the beam spread and near field length. However, materials change with velocity and attenuation, and a DAC curve still needs to be created