What is a Flawed Specimen?

pipe system, tube, construction site


Do you ever wonder about the purpose served by flawed specimens?

The advantage obtained from using ultrasonic calibration tools ensures that flaw types are easily detected. Nonetheless, specific defects rarely occur in a production line which means that a technician can be unaware of the occurrence of such faults. Therefore, inspection instructors need to put in place a medium to help technical support identify and understand how to pinpoint such flaws. Also, they should be able to identify what correctional practices must be undertaken to eliminate these defects. These steps can help to produce a component without blemish. We have written this piece to address these issues. So, let’s begin.

1. What is a Flawed Specimen?

In a production line, unintended flaws could be made. This is an expected phenomenon. But there are times when intentional flaws are created to an end. This is when it is referred to as an ultrasonic Testing Flawed specimens.

What could be the end you’d wonder? The reason for intentionally creating a flaw is to check out three responses from the inspection technician. Firstly, it’s to ascertain that the NDT expert can catch or detect a flawed specimen. Secondly, to determine if the technician can sort and expedite a flawed component. Lastly, it is done to test the expert’s knowledge of certain industry standards, techniques, or codes.

2. What Types of Flaws are in Ultrasonic Specimens?

There are various types of flawed ultrasonic specimens. But they are standard flawed specimens created for factors that relate to the flawed specimen and the reason it was created. Specific types of ultrasonic flawed specimens include lamination, center-line crack, incomplete penetration (SV), root crack, incomplete penetration (DV), slag, side-wall crack, lack of root fusion, transverse crack (embedded), fusion, toe crack, etc., Some other ultrasonic flawed specimens are, joined materials, type and size of materials, code specifications, and welding process.

3. What Types of Flaws are in Radiographic Specimens?

There is a wide range of flawed specimens in the manufacturing line. Specimens such as custom specimens, educational gadgets, specimen sets, etc., and there are standard flawed specimens employed for standard non-destructive testing. However, the standard flawed specimen has a few branches of its own, and radiography is one of them. Therefore, some standard flawed specimen types for non-destructive testing in radiography include root concavity, porosity, slag line, excess penetration, root crack, lack of root fusion, incomplete penetration, burn through, tungsten, transverse crack, undercut, and mismatch. These are the types of flawed specimens in radiography.

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4. What Types of Flaws are in Visual Specimens?

Another common non-destructive testing flaw is visual inspections. They are popular for identifying and inspecting flaws. If you’re considering an inspection method to start with, then it should be a visual inspection. Hence, its high deployment in the inspection of defects. For that reason, the flawed specimens accessible in visual inspection includes, lack of root fusion, excess penetration, surface porosity, irregular penetration, crater cracks, undercut crater cap, root concavity, incomplete penetration, excessive weld spatter, etc., Visual specimens are widely employed as it is the first inspection method in many manufacturing fields, and then other inspection methods can be considered.


In a nutshell, a technician needs to be able to identify flaws. Hence the need for flawed specimens especially in non-destructive testing. They are principal in ultrasonic testing as well because they are cheap to employ, compared to on-the-job flaw detection. Moreso, its accuracy is highly commendable.

It also does not require destroying a sample before detecting the flaw, and it’s massively crucial to understand the types of flawed specimens employed in varying testing environments. With that, we trust you can comprehend why flaw specimens are advocated for ultrasonic testing.