Tickles from a work price. In ultrasonic application. the frequency to the sound

Question

Tickles from a work price. In ultrasonic application. the frequency to the sound is sometimes important. List three examples for which hot wire cutting might be a good method of material removal. List three examples for which a cutting torch would be the best method of Materia, cutting. List three examples for which laser cut, mg might, be a good method of material removal. List three the major advantages and limitations of laser cutting. List the major advantages and limitations of oxyacetylene cutting. List three applications for which water saw cutting would be a good method of material removal. Would the use of a water saw to cut up automobile tires be a good method to do so? Which method of cutting would be better for titanium-a water saw or band saw? Why? List three applications for which electron-beam machining might be a good method of cutting. Given the processes of oxy-acetylene cutting, water saw cutting, and electron-beam cutting, summarize or list the advantages and limitations of each.

Explanation / Answer

3.a)Laser Perforating-it is used for perforation of packaging films to prolong the freshness and quality of perishable food. Micro perforation enhances the shelf life of vegetables etc. by exchanging oxygen through micro holes in the range of 60 – 100 µm

b)Drilling of Silicon wafers-it is used to drill micro holes in silicon wafers with virtually no micro cracks or edge melting which might weaken the cell during further processing. Laser drilling is also used for drilling of precision holes for injection nozzles in the automotive industry or needle holes in medical industry.

C)Laser removal of oil, grease, rust etc-High-power short laser pulses are used to remove oil and build-up by selective decoating without damaging or melting the surface

4)Advantages:

a)it can cut almost any material conductiing non conducting,hard soft brittle metal non metal etc

b)Fast effecient easily and accurately repeatable

c) No secondary damgages

d)No secondary clean up process required for most materials

limitations:

a)Difficulty cutting reflective metals like copper, brass, and sometimes aluminum etc

b)Expensive as compared to process like processes plasma or water-jet cutting

c)material removal rate is very very low

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