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Basic Concept of Welding

Basic Concept of Welding

          
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About the Book

Welding process plays very important role in construction industries across the world and it is important to know the basic concept of weld to enhance the knowledge for quality job. A complete welding process involves three main parts. 1. Base metal 2. Consumable 3. Process type To understand the subject in easy way let us focus on each individual part. 1. Base Metal: Mechanical properties of base metal depend upon grain size and arrangement. After receiving heat grain size and arrangement may get disturbed and during solidification it may not form typical grain structures. During welding process our botheration concerns with welding defects and mechanical properties. As off there is no way to eliminate welding defects and retain mechanical properties equal to base metal. Despite of best effort defects can be only minimized and properties can be achieved very close to base metal. Reason is no material is pure because of atmospheric attack or elements added to meet the property for service requirement. Elements get associated randomly with base metal against desire is called impurities and elements added to base metal intentionally for serving purpose, it becomes alloys. The added elements affect the solidification behavior and due to impurity of base metal the total metallurgy is concerned with time and temperature. If the metal is pure, solidification starts just below melting temperature and it forms typical grain structures which gives good mechanical properties. 2. Consumable: In welding process consumable is filler metal which has two basic type consumable filler metal and non consumable used in welding different process. Consumable filler metal involves covered electrode, bare electrode wire, tubular electrode wire, non consumable electrode and welding flux. 3. Process type: Commonly used process are Shield Metal Arc Welding (SMAW) / Manual Metal Arc Welding (MMAW), Flux Core Arc Welding (FCAW), Submerged Arc Welding, Gas Metal Arc Welding (GMAW), Tungus ten Inert Gas Welding (TIG). The most common process of welding used across the world is Shield Metal Arc Welding. It is Arc process which generates heat to melt the electrode. It is important to know how heat is generated. SOURCE OF HEAT ENERGY IN SMAW PROCESS During arc welding process welder just touches the electrode to work piece and withdraw back soon, moving his hand ahead maintaining reasonable gap between electrode and work piece. End of electrode gets fused and deposited on joint. ............................. ........................... Anode ] ] Plasma [ - Cathode ............................ ] Column [ .......................... The main source of heat is electric Arc. Arc main function is to supply heat to melt electrode. Arc is electric current and electric current is mass of electrons flowing between two polarities Anode and Cathode similar to electrode and base metal. Gap between Anode and Cathode is called Plasma Column which is composition of ionized gas and metal vapor. Plasma Column = Arc. In arc process welding welder just touches electrode to work piece and immediately withdraw back keeping reasonable gap to form plasma column and burning starts. Some times it happens welder touches the electrode to joint and immediately he does not withdraw back. Then electrode gets struck up and welder moves the electrode many times to detach. In this case due to no gap between Anode and Cathode plasma column does not form. There is another situation noticed welder touches electrode and withdraw immediately but keeping more gap. In this case required reasonable gas is not maintained and plasma column did not form. It is true that without medium electrons (electric) do not travel from one to another point. However it is possible to travel without medium maintaining reasonable gap. Easy to understand: Reasonable Gap = Plasma Column = Short circuit = Fire.


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Product Details
  • ISBN-13: 9781983333071
  • Publisher: Independently Published
  • Publisher Imprint: Independently Published
  • Height: 229 mm
  • No of Pages: 26
  • Series Title: Basic Welding Concept
  • Weight: 54 gr
  • ISBN-10: 1983333077
  • Publisher Date: 30 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 152 mm


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