Page 131 - WCS - Electrical
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WORKSHOP CALCULATION & SCIENCE - CITS
Fusibility (Fig 6)
It is the property possessed by a metal by virtue of which it melts when heat is applied. Many materials are
subject to transformation in the shape (i.e) from solid to liquid at different temperatures. Lead has a low melting
temperature while steel melts at a high temperature.
Tin melts at 232°C.
Tungsten melts at 3370°C.
Mechanical properties
• Ductility
• Malleability
• Hardness
• Brittleness
• Toughness
• Tenacity
• Elasticity
Ductility (Fig 7)
A metal is said to be ductile when it can be drawn out into wires under tension without rupture. Wire drawing
depends upon the ductility of a metal. A ductile metal must be both strong and plastic. Copper and aluminium
are good examples of ductile metals.
Malleability (Figs 8 and 9)
Malleability is the property of a metal by which it can be extended in any direction by hammering, rolling etc.
without causing rupture. Lead is an example of a malleable metal.
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CITS : WCS - Electrical - Exercise 11
