Month: October 2017

Development Of Radiography Film

About radiography films: Radiography films are primarily made up of two things; 1. Base 2. Emulsion Base: Base is a transparent, flexible blue tinted object, usually made from a clear and flexible plastic such as cellulose acetate. It provides physical support to emulsion and does not participate in the image-forming process. It is not sensitive …

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Radiography Testing

Radiography testing (RT) is one of the most widely used non destructive test (NDT) method. With the help of this method we can detect hidden flaws or discontinuities present in welds such as cracks, porosity & blow holes, slag, flux or oxide inclusions, lack of fusion, incomplete penetration, Mismatch and tungsten inclusion etc. Short wavelength …

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Preparatory Questions (Set – 6)

1.  Which of the following processes joins metals plastically? Friction welding Resistance welding Plasma welding None of the above 2.    In submerged arc welding, excessive arc voltage may cause? Excessive penetration Change in weld metal composition Narrow weld width All of the above 3.   In a tensile test, a brittle material would be indicated …

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Preparatory Questions (Set – 3)

1. Overlap in welds could be influenced by: Welding process Welding position Poor welding technique All the above 2. In MAG/CO2 welding which parameter gives the greatest control of weld appearance during dip transfer or short-circuiting welding? Wire stick-out length Welder’s convenience Wire feed speed Inductance 3. In X-ray work the quality of the radiographic …

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Preparatory Questions (Set – 2)

1.  Stress relieving is not helpful in which of the following cases? Softening the steel Lowering the peak residual stress Improving resistance to stress corrosion cracking Improving dimensional stability after machining 2.  Stray arcing may be regarded as a serious defect because: It may reduce the thickness dimension of a component It may cause liquation …

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Welding Symbols (Part -1)

Welding symbols are a set of information conveyed by the design department to the welding Engineer and the welding operator. It contains all the necessary information viz. welding position, dimensions and geometry of the weld, details of groove/fillet, welding process etc. A basic weld symbol consists of three parts namely; Arrow Line Reference Line Tail …

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