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 …
1. The Discontinuity which results from the entrapment of gas within the weld cross-section is known as: Undercut Lack of penetration Lack of fusion Porosity 2. A discontinuity can be called as a defect only when; It is a Linear indication It is a rounded indication It exceeds the code limit if it is a …
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 …
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 …
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. …
This article is about different welding positions used in Plate Welding, Pipe Welding & Stud Welding. Plate Welding 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 welding (V-groove, …
What is Steel? Steel is an alloy of Iron and the principal (main) alloying element is Carbon. However, there are some exceptions to this definition like interstitial-free (IF) steels and type 409 ferritic stainless steels, in which carbon is considered as an impurity. What is an Alloy? When different elements are mixed in …
GMAW (MIG welding) electrodes are designated by some letters and numbers such as ER70S-6, ER90S-6 and E308L etc. I will explain the meaning of these symbols: FOR CARBON STEEL OR MILD STEEL (SUCH AS ER70S-6 OR ER70S-3) Where, ER – Designates electrode or filler rod XX – Designates the minimum tensile strength of the deposited …
MIG welding or Metal Inert Gas Welding is also known as Gas Metal Arc Welding (GMAW). In MIG welding process, consumable electrode is used in the form of filler wire and a shielding gas such as Argon, Helium, Carbon dioxide or a mixture of these gases are used. These gases shield the molten weld pool …
Shielded Metal Arc Welding (SMAW) is also known as Manual Metal Arc Welding (MMAW) or stick welding. It is a manual arc welding process that uses a consumable electrode (covered with flux). The electrode is connected with one terminal of the power source and the work is connected with the other terminal of the power …
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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Welding is a process of permanently joining two parts by the application of heat and (or) pressure. Filler metal may be added to the joint depending upon the welding process and the type of joint. The American Welding Society (AWS) has recognized more than 50 different types of welding processes, some of them are very …
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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 …
Dye Penetrant Test (DPT, LPI, PT) – Non Destructive Test Read More »
Welder Performance Qualification (WPQ) is also known as Welder Qualification Test (WQT) or Performance Qualification. It is a very basic but one of the most important steps before assigning a job to the welder. The welder qualification test (WQT) is performed to determine the skill of a welder or in other words, we can say …
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