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MECHANISM OF LASER WELDING
Laser welding of metals is performed with beams focused to irradiate levels in the range of 106 to 107 W / cm2. At such power densities, melting occurs in less than a millisecond. First, the radiation pressure becomes appreciable capable of supporting 0.5 mm liquid steel column. Next, the molten liquid has an appreciable vapour pressure. The metal vapour, now interacts with light through the process of inverse population, where electrons in the field of an ion may be accelerated by electromagnetic radiation. This heats the vapour, increasing the number of ions and hence the absorption. Now the plasma, which is a highly ionised gas that absorbs laser light and emits back body radiation. As long as power density is sufficient to sustain it the plasma will act as an efficient absorber.
A shaft is hinghed by two bearings placed 1.0 m apart. A 600mm diameter pulley is mounted at a distance of 300 mm to the right of left hand bearing and this operates a pulley direc
Clutch cable model: Ensure the cables fitted is of the respective model and not interchanged with other model. Also ensure that the cable is genuine.
Part Contact States The loading, movement and unloading of parts via the manufacturing system should be scheduled through supervisory computer. In contrast along with classical
Types of Registration Provisional Registration Certificate ( PRC ) This is given for the pre-operative period and enables the units to obtain the term loans and worki
whta is tortion
Q. Handling Suspect Material? • Material or items at a Supplier's facility or those received or stored in the warehouse or other construction site location that require PMI-tes
Coplanar and Non-Coplanar Forces: In this unit, you have learnt to identify the different systems of forces. You have also learnt the many techniques of adding the forces to g
Types of Cooling System: Two types of cooling system are used in two wheelers. (a) Natural air-cooling. (b) Forced air-cooling.
Prove the torsion equation T/J=τ/R=C. θ/L for the solid circular shaft. State the various assumptions used on above said equation.
According to the explanation, why reverse will happen in the case of cantilevers? ( that is, tensile stresses will be induced in upper layers and compressive stresses will be induc
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