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...