mechanical engineering

A properly designed casting, a properly prepared mould and correctly malted metal should result in a defect free casting. However, if proper control is not exercised in the foundry-sometimes it is too expensive - a variety of defects may result in a casting. These defects may be the result of: (a) improper pattern design, (b) improper mould and core construction, (c) improper melting practice,

Pattern:  A replica of the  the final casting, used to form the mold cavity.         A pattern is an element used for making cavities in the mould, into which molten metal is poured to produce a casting. It is not an exact replica of the casting desired. There are certain essential differences. It is slightly larger than the desired casting, due to the various allowances (shrinkage

What is Casting :  Casting is one of the most ancient processes of manufacturing metallic components. Also with few exceptions  it is the first step of manufacturing metallic components. The Basic steps of casting  1.       Melting the metal. 2.       Pouring it into a previously made mould or cavity which

In the flux shielded metal arc welding process coalescence is produced from the electric arc. Here the electric arc is produced between the workpiece and the electrode. Here is to mention that the electrode is coated by flux to prevent oxide formation. In other other words the coating prevents contamination from the environment. This coating also helps in performing stability and weld metal

Advantages of Submerged Arc Welding 1. Molten flux provides very suitable conditions for high current to flow. Great intensities of heat can be generated and kept concentrated to weld thicker sections with deep penetrations. 2. Because of high heat concentration, considerably higher welding speeds can be caused. 3. Because of high heat concentration and high welding speeds weld distortion is

Internal energy in thermodynamics  Internal energy is defined as the sum of microscopic energies of all the molecules of a system which may appear in several complex forms. These forms may include  Inter-molecular potential energy, associated with   forces between the molecules.  Molecular K.E associated with transitional and rotational velocity of each molecules. Intra molecular energy

Gas Metal Arc Welding is generally known  as MIG (Metal Inert Gas) welding.  Metal Inert Gas (MIG) welding is a commonly used high deposition rate welding process.  Wire is continuously supplied from a spool.  MIG welding is known to as a semiautomatic welding process. Principle of Operation Gas and water flow are checked again and again before catching the fire (igniting). Proper