Page 235 - CITS - Welder - Trade Theory

WELDER - CITS

c Environmental friendly materials are used (water and garnet). Reuse of the abrasive up to 80% is possible. No
impurities like oil and emulsions.
d No dust or fume generated
e Loss material to be cut is too small
f Heat generated during the process is insignificant
g Almost no distortions
h One tool for cutting different types of materials and thicknesses
i Can cut very thick materials (over 300 mm)
Limitations
a High speed linear cutting gets a V profile
b Water jet deviates at high speed cutting of circles and arches
c Water jet may produce notches at high speed cutting of inner angles
d In cutting of thick materials striations may occur along the depth of the cut due to high
e Transverse speed or insufficient pressure
f Limitations in machining 3D shapes
g Machining very hard materials is difficult
h After cutting, corrosion prone materials need to be protected
INTRODUCTION
Laser Cutting
Mechanical Cutting Each method has its relative pluses and minuses and no one method fits every situation. The
thickness of the stock to be cut, hardness of the stock, whether or not the stock is stacked or layered, your cost
and timing requirements, and the desired condition of the material after it’s been cut are among the key factors
that determine which method is right for a particular job. There are also some application procedures where one
process or another is most suitable. Before we compare the three methods, let’s briefly overview how they work.
Laser

The cutting action is the result of light from a laser (typically a CO2 laser with an energy of up to 2600 watts)
passing through a lens and being directed at the material to be cut.

Fig 2

Mechanical
The cutting action occurs when a power-driven, hardened cutting blade removes excess material to create a
desired shape. Three of the most common mechanical cutting methods are as follows.
Die cutting: A die (a blade made in a particular shape, like a cookie cutter) shears webs of sheet metal or other
relatively low-strength stock such as rubber or plastic.

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CITS : C G & M - Welder - Lesson 77 - 82