Sunday, 11 October 2015

Types of Welding

Today we will discuss about welding and types of welding. Welding is the process of joining similar metals by application of heat with or without application of pressure and addition of filler material. It is used as permanent fasteners. In the every metal industry welding is used widely.  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. 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.

Types of Welding

1. Plastic welding:

In the plastic welding or pressure welding the pieces of metal to be joined are heated to a plastic state and then forced together by external pressure. This procedure is used in forge welding, resistance welding thermit welding and gas welding. 

2. Fusion welding:

In the fusion welding or no pressure welding, the material at the joint is heated to a molten state and allowed to solidify. This includes gas welding, arc welding etc.

3. Cold welding:

In this welding the joints are produced without the application of heat, but by applying pressure which results in intersurface molecular fusion of the parts to be joined. This process is mainly used for welding nonferrous sheet metal, particularly aluminum and its alloys.

4 Main Welding Processes:

1. Arc Welding (Fusion Welding):

In this type of welding 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. 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 form 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.  The temperature at the center of the arc being 6000 OC to 7000OC
Types of Welding

2. Gas Welding:

The gas welding is done by burning a combustible gas with air or oxygen in a concentrated flame o 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 materials

Types of Welding

3. 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.
Types of Welding

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. 
Types of Welding
Today We have discussed about welding and Types of Welding. If you have any doubt or query put it in comment box. 


Post a Comment