Nondestructive Testing service providers

  we provide  standard specifications for welding inspection procedures  for all welding process and Brazing. We offer Welder Procedure Specification, Welder Certificate Renewal Process, Procedure Qualification Record, Welder Qualification Testing, welder Training and Welder qualification services  in Coimbatore, Trichy, Salem, Erode, Chennai.

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  Welding Inspection duties General   Conditions:    Understand shop drawings, erection drawings, referenced codes and standards. Review the manufacturer’s  Material Test Report (MTR) . Verify all materials properties and that all materials are readily identifiable and traceable to an MTR.    Conduct a complete visual examination of the welding area for visible discontinuities. Visual examination should include, as a minimum, the finished conditions of the seam weld.    For visual examination, the only equipment commonly used is a  magnifying glass  (10x or less) and a  flashlight . Other tools, such as a  borescope and dental mirrors , are useful for inspection inside vessels, pipe, or confined areas.    For structural plates, piping, wrought and cast steel, conduct a complete visual examination of surfaces for visible fabrication defects or discontinuities.    Verify that all applicable welders, weldi...

   Steel is an alloy of iron usually containing   less than 1.5% carbon . Steel can be cast into bars, strips, sheets, nails, spikes, wire, rods or pipes as needed by the intended user. Steel making process  at an integrated steel plant involves  three basic steps . First, the  heat source  used to melt iron ore is produced. Next the  iron ore  is melted in a furnace. Finally, the molten iron is processed to  produce steel . The fuel source is often purchased from off-site producers. Steel is made by the Bessemer, Siemens Open Hearth, Basic Oxygen Furnace, Electric Arc, Electric High-frequency and Crucible processes. In the former steel making process, molten pig iron is  refined  by blowing air through it in an egg-shaped vessel, known as a  converter . In the Siemens process, both acid and basic, the necessary  heat  for melting and working the charge is supplied by  oil or gas . Coke  is a solid carb...

  Equipment’s required for Welding Institute set up. Welding is a process of joining metals or nonmetals such as plastic. There are different types of welding, and few of them are as below. SMAW- Shielded Metal Arc Welding (commonly called as ARC welding in the locality ) GMAW – Gas Metal Arc Welding – MIG /MAG GTAW – Gas Tungsten Arc Welding / TIG – Tungsten Inert Gas Welding FCAW – Flux Cored Arc Welding ERW – Electric Resistance Welding FSW – Friction Stir Welding SAW – Submerged Arc Welding LW – Laser Welding EBW- Electron Beam Welding GW- Gas Welding Ultrasonic welding And much more. A welding process can be done as Manual or Semi- Automated or Automatic / Robotic. To start up a  basic welding Institute it essential to have at least the basic three welding machines – SMAW , GTAW and GMAW welding machines And machines of Gas Welding , EBW and Laser Welding machines will be of added advantage. The training institute for welding should have a complete set up of Welding booth...

  Material testing Mechanical testing  have been designed to test several weld properties.Few other material testing techniques are Charpy V-Notch Toughness: Notch toughness is the capacity that a material possesses to  absorb energy  in the  presence of a flaw , such as a notch or crack. The material will likely exhibit a lower level of toughness. When a flaw is present in a material, loading induces a triaxial tension stres s state adjacent to the flaw. The material  develops plastic strains  as the yield stress is exceeded, near the crack tip. Notch-toughness is  measured with a variety of specimens  such as the  Charpy V-notch impact  specimen or the dynamic tear test specimen. As with regular impact testing the tests are often repeated numerous times with specimens tested at a different temperature. With these specimens and by varying the loading speed and the temperature, it is possible to  generate curves such as those s...

  Mechanical tests . Mechanical tests (exclusive of hardness) have been designed to test several weld properties. 1.    Tensile Test:    Tensile tests are conducted on specimens machined from a test weld and are used to measure the strength of the weld joint. Specimens are usually taken perpendicular to the weld, which is centered in the specimen.     Specimens are sometimes taken along the weld and consist entirely of weld metal. Specimens may have round or rectangular cross sections, depending on the requirements of  the applicable welding code. The testing machine applies a tensile force until ruptures .    From readings on the machine and measurements of the specimen before and after the test, properties such as yield point or yield strength, ultimate strength, and ductility are calculated.    Guided bend tests indicate a weld’s ductility . Test specimens are described as root-bend, face...