A Complete Online Guide For Every Mechanical Engineers
Ultrasonic Welding: Ultrasonic welding is represented as a friction welding method, where oxides and other contaminants present on the material surfaces are broken up and also the components to be welded are brought together under simultaneous pressure. Molecular bonding, just like the conventional cold-press welding, then takes place. Ultrasonic welding is the conversion of high…
Ultrasonic Welding: The human ear can hear mechanical vibrations in the frequency range of 16 Hz to 16 KHz. Inaudible frequencies below 16 Hz are known as infrasound and those between 16 KHz and 100 GHz are known as ultrasound. Frequencies above 100 GHZ are known as hyper sound. The process is “green” in that…
BEARINGS A bearing is a machine element that constrains relative motion between moving parts to only give the desired motion. The design of bearing may be provide for free linear movement of the moving parts or free rotation around a fixed axis or it may prevent motion by controlling the vectors of normal forces that…
Speed Governor The governor is a device which is used to controlling the speed of an engine based on the load requirements. Basic governors sense speed and sometimes load of a prime mover and adjust the energy source to maintain the desired level. So it’s simply mentioned as a device giving automatic control (either pressure…
STEERING The steering system in a vehicle is used to move the vehicle in a particular direction. This is a very important sub-system in a car without which it would be impossible for a vehicle to follow its desired path. The steering system can be used to steer all kinds of vehicles like cars, trucks,…
Laser Beam Welding setup: Laser beam welding is a welding process that uses a laser beam to melt and vaporize material. A ruby laser rod is used for machining process. Here the lasing material is in the form of a solid ruby rod (doped with chromium) with the end faces made parallel to each other…
Laser History: The principle of stimulated emission and the quantum-mechanical fundamentals have been presented by Einstein in the year 1917. After the stimulated emission theory, realization of MASER (Microwave Amplification by Stimulated Emission of Radiation) by Towens of Columbia University and Prokhorov and Basov of Moscow University combine receive the noble prize in the field…
LASER Beam Properties: Laser is a powerful source of light having extraordinary properties which aren’t found within the traditional light sources like incandescent lamps, mercury vapour lamps, etc. the unique property of laser is that its light waves travel to a terrible distances with little or no divergence. Just in case of a standard source…
Laser Beam Welding: Definition: Laser beam welding is a welding process that uses a laser beam to melt and vaporizes a material. LASER (Light Amplification by Stimulated Emission of Radiation) beams are very high energy density electromagnetic beams which are highly coherent, monochromic and unidirectional. Power of LASER: For example, a LASER can give a…
Pressure Thermit Welding: Pressure thermit welding is a process in which the heat produced by the thermit reaction is utilized only for heating the ends of the pieces to be joined, while the actual joint formation occurs by solid pressure welding. History of Thermit welding: In 1893 Hans Goldschmidt of Germany began to experiment with…
Cad welding / Cadwell thermit welding process: Cad welding or Cadwell Welding process is a modification of the simple thermit welding process (exothermic welding process) in which controlled reduction of copper oxide and aluminium is used to produce molten copper and aluminium oxide slag. Exothermic is a chemical term describing a chemical reaction which gives…
Thermit Welding Thermit welding is a fusion welding process that makes use of the intense heat produced when a mixture containing iron oxide and powdered aluminium is ignited. The reaction is based on the high affinity of aluminium is ignited. It reduces iron oxide to thermit steel and slag, like this 8Al + 3Fe3O4 –…
Thermit welding steps: Various steps involved in the non pressure fusion thermit welding of metal parts is explained below. The mold is non-repetitive in nature and is used for repair welds. 1. Clean the joint: An oxy-acetylene torch may be used to clean the metal surfaces by heating. During cleaning all dirt, grease, loose oxides,…
Plasma Arc Welding: Plasma is the name given to a high temperature stream of partially ionized gas flowing at near sonic velocity. It is a mixture of neutral atoms, free electrons that have disassociated from the gas atoms and positively charged gas ions. Plasma arc welding is an arc welding process wherein coalescence is produced…
