Types Of Welding Process
Welding is a process of joining similar and dissimilar metals or other material by application of heat with or without application of pressure and addition of filler material. It is used as permanent fasteners.
Welding is essential process of every manufacturing industries. In fact, the future of any new metal may depend on how far it would lend itself to fabrication by welding.The weldability has been defined as the capacity of being welded into inseparable joints having specified properties such as definite weld strength proper structure. The weldability of any metal depends on five major factors.
The process known as Arc welding is a general category that includes two different types of welding sub-categories: the consumable electrode methods and the non-consumable electrode methods. The category under the Arc Welding umbrella known as the Consumable Electrode Methods are the processes known familiarly as Stick Welding, MIG Welding, Flux-Cored Arc Welding, and Submerged Arc Welding. Types of Welding Processes – to simplify welding – Part 1 Stick welding. Flux Cored Arc Welding.
These are melting point, thermal conductivity, thermal expansion, surface condition, and change in microstructure.Types of welding:Basically welding may be classified into three types.1. Plastic welding:In plastic welding or pressure welding process, the pieces of metal to be joined are heated to a plastic state and then forced together by external pressure. These welding are also known as liquid-solid welding process. This procedure is used in forge welding and resistance welding.2.
Fusion welding:In the fusion welding or no pressure welding process, the material at the joint is heated to a molten state and allowed to solidify. These welding are also known as liquid state welding process. This includes gas welding, arc welding, thermite welding etc.3. Cold welding:In this welding process, the joints are produced without application of heat, but by applying pressure which results diffusion or inter-surface molecular fusion of the parts to be joined. It is also known as solid state welding process. This process is mainly used for welding nonferrous sheet metal, particularly aluminum and its alloys.
This includes ultrasonic welding, friction welding, Explosive welding etc.4 Main Welding Processes:1. Arc Welding (Fusion Welding):In this type of welding process, weld metal melted from the edges to be joined and allow to solidifies from the liquid state and usually below the recrystallization temperature without any applied deformation. Arc welding is most extensively employed method of joining metal parts by fusion.
Types Of Welding Processes
In this welding the arc column is generated between an anode, which is the positive pole of power supply, and the cathode, the negative pole. When these two conductors of an electric circuit are brought together and separated for a small distance such that the current continues to flow through a path of ionized particles called plasma, an electric arc is formed. This ionized gas column acts as a high resistance conductor that enables more ions to flow from the anode to the cathode. Heat is generated as the ions strike the cathode. This heat used as melting of metal to be joined or melting the filler metal which further used as joining material of welding metal. The electrode is either consumable or non-consumable as per welding requirement.
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The temperature at the center of the arc being 6000 OC to 7000OC2. Gas Welding:The gas welding is done by burning of combustible gas with air or oxygen in a concentrated flame of high temperature. As with other welding methods, the purpose of the flame is to heat and melt the parent metal and filler rod of a joint. It can weld most common materials3. Gas Metal arc welding (MIG):This welding is also known as metal inert gas welding. In this type of welding a metal rod is used as one electrode, while the work being welded is used as another electrode.
It is a gas shielded metal arc welding which uses the high heat of an electric arc between a continuously fed, consumable electrode wire and the material to be welded. Metal is transferred through protected arc column to the work.In this process the wire is fed continuously from a reel through a gun to constant surface imparts a current upon the wire. In this welding the welding area is flooded with a gas which will not combine with the metal. The rate of flow gas is sufficient to keep the oxygen of the air away from the hot metal surface while welding is being done.4. Gas Tungsten Arc Welding (TIG):This welding is also known as tungsten inert gas welding is similar to the MIG in that is uses the gases for shielding. This arc welding process uses the intense heat of an electric arc between a no consumable tungsten electrode and the material to be welded.
In this process the electrode is not consumable during welding process and gas is used to protect the weld area form atmospheric air. Dear Admin,Thanks a lot for your wonderful work.I really appreciate your work.I wish if pdf format was available.it will provide more comfort to learn the topics with more ease.Another thing that I felt that contents provided are awesome but at the GATE level you need to improve a lot.lots of materials should be added so that for those who are preparing for GATE or other Engineering competitive Exams can get much more benefits.Thanks again.Wish you and all the members, all the best for your future.RegardsVishal S.
Today we will learn about arc welding process and its types. Arc welding is one of the famous used in industrial work to join metal. It is one type of fusion welding in which metal is melted together to form the joint. The energy required for melt the work piece is taken by electric arc so it is known as arc welding. One of the main advantages of arc welding is that it can be easily develop a high temperature which is desirable for welding. The temperature of welding is about 6k to 7k in degree centigrade.
Types Of Welding Process And Working Principle
It uses both with and without filler materials.