Welding Defects

Any discontinuity (or irregularity) in the weld metal, which exceeds the applicable code limit, is termed as a WELD DEFECT (or Welding Defect). Please note that a discontinuity can be called as a defect only when if it exceeds the specified code limit, hence we can say that every defect present in the weld metal […]

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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 Test (RT)

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

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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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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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Types of weld joints

The American Welding Society defines a joint as “the manner in which materials fit together.” there are five basic types of weld joints: • Butt joint. • T-joint. • Lap joint. • Corner joint. • Edge joint. 1. Butt joint: Butt joints are end to end joint, in which the parts lie in the same

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TIG Welding (GTAW) Electrodes

In GTAW (Gas Tungsten Arc Welding) also known as TIG welding (Tungsten Inert Gas welding), a non consumable electrode (made up of Tungsten) is used. Tungsten is preferred due to high its high melting point (approximately 3,4100C) and high hardness. Either pure tungsten is used as electrode or it can be alloyed with other elements.

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Welding Positions

This article is about different welding test positions used in Plate Welding, Pipe Welding & Stud Welding. Plate Welding Test Positions In plate welding, we have four different positions namely; Flat position (1G or 1F) Horizontal Position (2G or 2F) Vertical Position (3G or 3F) Overhead Position (4G or 4F) Note: 1. G Designates groove

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welding electrodes

Welding electrodes – Understanding the SMAW electrode symbols

Shielded Metal Arc Welding (SMAW) electrodes are designated by “E” followed by four (or five) digits for example: E7018, E6013 or E10018. I will explain the meaning of these symbols: IF THE ELECTRODE HAS “E” FOLLOWED BY FOUR DIGITS (FOR EX. E7018) E – Stands for electrode XX – First two digits designates the minimum

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liquid penetrant inspection

Dye Penetrant Test (DPT, LPI, PT) – Non Destructive Test

Dye Penetrant Test (DPT) is one of the most inexpensive non-destructive test (NDT) methods, used to check the surface irregularities of any component. This test method is popular by many names, which are as follows; Liquid Penetrant Inspection (LPI) Liquid Penetrant testing or Liquid Penetrant test (LPT) Penetrant Test or Penetrant Testing (PT) The liquid

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