Published on 23-Dec-2022

Top 3 NDT Testing Methods For Welding

Top 3 NDT Testing Methods For Welding

Image Credit @ https://www.tuv.com/oman/en/non-destructive-testing-of-welds.html



Regarding non-destructive testing methods, it is a crucial procedure supporting a wide category of industries that maintain the world as we know it operates at the highest capacity. From renewable energy to infrastructure, non-destructive testing is crucial to keeping a safe & sound environment. In most industries that are supported by non-destructive testing, welding is utilized to develop, join and repair several objects. Non-destructive testing techniques can be particular to the substance's elements, locations, and accessibility. 


When we talk about the assets that have already been welded, three techniques are often utilized, they are: 


  • Ultrasonic Testing 

  • Liquid Penetrant Testing 

  • Magnetic Particle Testing


The most popular non-destructive choices for welding are mentioned below: 


1. Ultrasonic Testing 




Most NDT technicians agree on the fact that the best testing method when it comes to welding is none other than — ultrasonic testing. Ultrasonic testing is the procedure through which high-frequency sound waves are induced into the object in order to identify flaws. By utilizing a sending unit & a transducer, sound waves continue to travel within the material that is under examination, and any shortcomings will be automatically demonstrated on the indication screen.


Ultrasonic testing is known as the most accurate and precise technique of non-destructive testing. It has the ability to quickly and accurately determine shortcomings in welds without the help of labour-intensive set-up and with straightforward equipment. A method known as phased array pertains to using several transducers to scan a wide area of a weld, which increases the technique's efficiency.



2. Liquid Penetrant Testing 




Liquid penetrant testing is generally utilized as a non-destructive testing method for all kinds of tasks and substances, specifically for welded substances. Liquid penetrant testing is a non-destructive testing technique in which capillary activities identify shortcomings or discontinuities by utilizing a low-viscosity liquid splashed over the material's surface. The characteristics of capillary activities result in the penetrant getting into any voids or fissures that might be present on the surface of the object. 


When all the excess penetrant is eliminated by the inspector, the flaws or deformities will be revealed. This method functions accurately for welding because the liquid penetrant easily helps identify the flaws. However, a secure weld will not enable the penetrant to get in. If any liquid penetrant flows through the weld, deformities can be identified, and the inspector will get to learn about the flaw immediately. 


3. Magnetic Particle Testing 


The third most used method for welding is magnetic particle testing. It is another widespread non-destructive testing technique. Like liquid penetrant testing, magnetic particle testing includes applying iron particles to the object's surface. Magnetic particle testing uses a fine, pigmented ferromagnetic powder on the material's surface. 


As the magnetic particle testing must be conducted on ferromagnetic substances, and when the magnetic field has pertained to the object under examination, the ferromagnetic powder will be drawn toward any deformities or discontinuities by developing a visible indication. This specific method is quite effective for welding because carbon steel welds are ferromagnetic in nature; hence, it can be examined effectively using magnetic particle testing.



In Conclusion 


When it comes to welding, it is the most significant part of areas like infrastructure, manufacturing, and many other utilities around the globe. It is important that non-destructive testing technicians are well aware of the best ways to work with welded substances. If you are someone who is looking to become an NDT technician through NDT training & courses or hire non-destructive testing services to preserve your materials, it is extremely important to select the right company to fulfil your NDT requirements, specifically if you have welded substances that require servicing! 


OneStopNDT is a platform that can help you with NDT courses, knowledgeable technicians, and hands-on coursework to teach all aspiring technicians about NDT certification. Visit our website to know more! 



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