Nondestructive Testing service providers

  What is Ultrasonic Testing? ULTRASONIC TESTING is a method for sending ultrasound into material and analyzing the returning sound waves for defect free components. It use scanning devices called probes. After application of Couplant over the material surface probe is place over the material. The sound travels to the end of the material and reflects back to the probe. There will be a change in acoustic property between the material and air. As a result the reflection sound is noted as back wall echo in the UT flaw detector machine screen. How to scan for defects in Ultrasonic Inspection? If the sound waves meet a defect in between the front walk and back wall, again there will be reflection due to acoustic property. Difference between the material and defect material, which appears between the initial sound echo and back wall echo. Thus any defect inside the material is detected by noticing the defect echos in between the initial echo and backwall ec...

Welding is a process of joining similar metals, i.e. Metals with same base content and similar properties or melting point.There are different types of welding methods based on the process of welding. Generally it involves heating of the metal and fusing them, with or without additional filler metal. The content below answers your questions: What are the types of Base metals? What is Carbon Steel and what is Alloy Steel? What is purpose of alloying element in steel? How are steels classified? Different Base metals in general industry are :- Steel: Low Carbon Steel – C 0.05 to 0.3 % (ex: AISI 1005, 1008 etc) Medium Carbon Steel – C 0.3 to 0.8 % High Carbon Steels – C > 0.8 % (ex. A 36) Alloy Steel – (Cr, V, Co, Mo, Ni, Nb, Ti, W, V, Zr etc.) Stainless Steel (ex: SS304, SS 316 L, etc) Cast Iron – C >2% Aluminum Copper, Brass Titanium Magnesium Alloys Why is Alloying Element added in steel? Alloying elements are added to achieve a spe...

  Welding is a process of joining two base metals by heating it. It can be done with or without additional filler metal being used. Below are the few types of welding process : 1)Shield Metal Arc Welding, 2) Metal Inert Gas Welding 3) Tungsten Inert Gas Welding 4) Oxygen fuel gas welding 5) Friction Stir Welding (no filler metal required) 6) Electric Resistance Welding (no filler metal required) and few more…. For welding with additional filler wires, care should be taken that the selected filler wire or electrode is compatible for the metal being joined. Collect the Material Test Certificate of the material . Batch test certificate of the filler wire and verify the values. First step is to check the chemical composition of filler wire. The minimum required chemical content should be present and maximum allowed chemicals should be restricted in the filler wire. If Carbon Equivalent value is restricted for the base metal then check the carbon equivalent value of t...

Here we would see How is Radiography testing used for finding defects?For Example look at the RT film here Find the Defect inside the Casting? Answer: Shrinkage – Sponge Shrinkage Shrinkage are volumetric defects caused during solidification of casting after pouring.It is caused due to inadequate metal to fill the shrink areas during cooling. Shrinkage are classified into four types 1) Linear Shrinkage 2) Feathery Shrinkage 3) Sponge Shrinkage and 4) Combined Shrinkage The best non destructive testing method to find the defect is Radiography or X Ray Testing. The given image is Film Radiography image of a steel casting with a hole type IQI placed on the area of interest, where a film sensitivity of 2-2T is achieved. The defect identified in the film is Sponge Shrinkage of level 5 as per reference images given ASTM E446. For best training and certification on Radiography Testing and Film Interpretation. Radiography Testing on defects and services reac...

What is Mechanical Testing or Material Testing? Mechanical testing involves finding strength of the material or quality of material by application of load mechanically. There are different mechanical testing for materials. They are Tensile test, Bend Test, Impact Test, Macro Etch Test, Micro Analysis, Inter granular Corrosion test, Vickers Hardness Test, Brinell Hardness test and includes Spectro Chemical Analysis. Why is Mechanical Testing on Materials required? Mechanical tests mentioned above are essential for materials to conclude the quality of materials. The material grades are designed for some specific application, in order to withstand the loads and environment in the application. The materials grades should achieve the minimum specified property. These minimum required quality specifications are verified by manufacturer after pouring the material and manufacturer should provide a mill test report. What is MTC / What is Mill Test Report ? Mi...

Radiography Testing or X ray Testing: Radiography Testing uses electromagnetic radiation from a source to capture image of the object. The source used may be gamma radiation emitting source or an X ray emitting source. Either of the radiation have capability of penetrating into matter , so that even an internally located defect’s image is captured. How is Radiography Image captured? The radiation penetrating into the object is made to fall on a detector; the detector may be a photosensitive film, a Phosphor plate, or a semiconductor flat panel. The image density formed on the film is directly proportional to the amount of radiation fall on it. Where ever the radiation falls directly on film the image is darker, when radiation passes through an object before reaching the film, radiation gets absorbed in the object and forms a lighter image on the film. The rate of absorption depend on the atomic number of the object material and thickness of the object....