This test is done when the welder is welding any pipeline or storage tanks. Our trained observer watches during the welding process and if finds any fault, it marks the particular area and works to repair the same. This test is the most cost-effective as it does not require many tools, but a magnifying glass and some measurement tools. Visual Inspection can also be beneficial when over welding or under welding has to be checked. After welding, visual inspection can provide aid in checking peripheral details like outer flaws, lumps in welds. However, it can only detect outer fissures and faults for more precise inspection we perform other tests.

In this a dye is used to detect any flaw. For which penetrant and developer are used. The former gets into the cracks and the latter when sprayed on penetrant magnifies the crack so the inspector can now clearly see what is to be mended.Let us get into the details as to how it works. The crevices which are not visible to the naked eye and are really fine can be detected using this test. Two types of coloring agents (dyes) are used for this purpose. One is, fluorescent dye which when penetrates into the cracks gives indication underUltra Violet (UV) light. Another is, ordinary colored dye is used which is visible under normal light conditions. The phenomenon is same for both, the applied liquid takes the room in between the spaces then comes developer into action which extracts the penetrant and makes the work easier by enlarging the visibility of color.It is a little time consuming because it takes quite an hour to show the difference; nevertheless it is widely used detection test, also fluorescent method is popular among two.

This technique is a little expensive than others, however it can penetrate even into the smallest cracks. The radiations are passed from one side of the weld being tested and on the other side there is a photographic film if turns dark means there was a presence of some crack which resulted in the formation of shadow.
In this Inspection X rays and Gamma rays are used. X ray usage has wider application than the latter. Although Gamma rays which are ejected out of the isotopes Cobalt 60 and Iridium 192 are more intense thus can penetrate into greater depths, it is not used commonly because it requires great deal oftime to show results. Rays are imparted from one side and photo sensitive plate is kept on another side. When there is any discontinuity in the welds it passes through the fracture and forms an image on film. It renders the size offault as well because the radiations are different depending upon the size.This detection test requires precautions so we have highly trained personnel to perform the test and carry out along with the required safety measures.

Magnetic Test can only be applied to ferrous substances. Fine granular magnetic particles are used to detect any fissures or leakage in the weld. If the particles change their direction and pattern it is assign of discontinuities in the metal, hence it would be repaired.
With this test, magnetic field is passed which produces magnetic flux. When these granular particles pass over any discontinuity may leak through. Theseparticles have an advantage as these particles adhere to the surface more persistently and make the whole detection process easy.The magnetic particles may be used dry or wet depending upon the weld to be seen. Mostly dry particles are used when inspecting heavy welds, while wet is used when the purpose is to detect components of fine welds. The particles are wet with light petroleum distillate. Wet test is more frequently used than its counter when it comes to precision.

It is clear by its name that sound waves are ejected off to thewelds. However, in this the frequency of the mechanical waves, which are similar to the sound waves, is quite intense. The waves are imparted into theweld if it finds any discontinuity it strikes back at the transducer which detects the fault. This cannot be used for surfaces. A coupling agent, such asgrease, is used to make uninterrupted contact between the detector and probe which emits sonic waves. the size of defect could be determined by the intensity of wavelength of
Ultrasonic wave which retraces its path.

North American delivers the best service when it comes to inquisition of any weld inpipeline or storage tanks used for oil, gas or power generation.