The Ability To Test Welds Has Progressed Rapidly Over The

1002 WordsMay 1, 20175 Pages
The ability to test welds has progressed rapidly over the years. After the discovery of the short pulsed electric arc in 1800 by Humphry Davy[3][4] and the continuous electric arc by Vasily Petrov in 1802, there was little development in electrical welding until 1881.Around that time there was little to be done as far as the rigidity of inspection goes. As long as man has been on earth, we have been visually testing things to see if it passes our persona critique of standard perfection. With weld quality assurance Visual Testing (VT) is where it welding inspection all starts. Before the first welding arc is struck, materials should be examined to see if they meet specifications for quality, type, size, cleanliness and freedom from defects.…show more content…
Floyd Firestone. With the general principle of my device consists of sending high frequency vibrations into the part to be inspected, ultrasonic testing is applied to many fields of metallurgy withing many occupations. Ultrasonic testing becomes less suitable when determining porosity in welds, because round gas pores respond as a series of single point reflectors to ultrasonic tests. UT inspection system consists of several functional units, such as the pulser/receiver, transducer, and display device. How Ultrasonic Testing (UT) works is by having an ultrasound transducer connected to a diagnostic machine is passed over the object being inspected.The pulser/receiver is an electronic device that produces high voltage electrical pulses, while the transducer, which is driven by the pulser generates high frequency ultrasonic energy. Separated by test object is a couplant. As sound is introduced, it spreads through the materials in the form of sound waves. When there is a discontinuity (such as a crack) in the wave path, part of the energy will be reflected back from the flaw surface. With a few advantages ranging from: High penetrating power, which allows the detection of flaws deep in the part, great accuracy, non-hazardous operation, portability, and immediate results. A few advantages of UT are : It is sensitive to both surface and subsurface discontinuities. The depth of penetration for flaw detection or measurement is superior to other NDT methods. It is highly

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