UNIT-2 CASTING AND WELDING

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Presentation transcript:

UNIT-2 CASTING AND WELDING

LASER BEAM WELDING Light energy is converted into heat energy. Hence, light energy is produced from the laser source like ruby rod in the form of monochromatic light Due to electrical discharge from the capacitors, the flash tube converts the electrical energy into light flashes When ruby rod is exposed to the intense light flash, the chromium atoms of the crystal excited & pumped to a high energy level beam This high energy level is immediately reduced to intermediate & drop to original state with the evolution of red fluorescent light. When this light energy is impacted to the work piece, it will convert into heat energy.

The various laser forms are 1. Liquid laser 2. Gas laser 3. Ruby laser 4. Semi conductor laser

Advantages It is used in glass & plastics Even very small holes can also be welded Accuracy is greater There is no heat loss Neat & clear surface finish can be obtained Disadvantages Welding process is slow Limited depth of weld can be done It is not suitable for large production

Applications: Thin metals about 0.5 to 1.5mm thick can be welded It is very much useful in electronic components welding It is used in aircraft components joining It is very much useful in joining metal alloys

PLASMA ARC WELDING Special form of GTAW in which a constricted plasma arc is directed at weld area Tungsten electrode is contained in a nozzle that focuses a high velocity stream of inert gas (argon) into arc region to form a high velocity, intensely hot plasma arc stream Temperatures is PAW reach 28,000°C (50,000°F), due to constriction of arc, producing a plasma jet of small diameter and very high energy density

Advantages Disadvantages Penetration is uniform Arc stability is good High accuracy weld can be produced High speed weld can be obtained Disadvantages Huge noise occurs during welding It is limited to high thickness applications Ultraviolet radiation can affect human body Gas consumption is high