by Sunday | Oct 6 | NABTEB QUESTIONS
i. NORMALIZING Normalizing is a heat treatment process in which the steel heated to 3°C-500°C above the upper critical point and cooled freely in air. To bring to normal the internal structure. ii. ANNEALING The purpose of annealing is to make the metal softer and...
by Sunday | Oct 6 | NABTEB QUESTIONS
Carburizing is the process of adding carbon to the surface layer of low carbon steel. The Carburize components possess a tough core together with a hard case. There are about three methods of carburizing i. Surrounding with a carbonaceous material ii. Immersing in a...
by Sunday | Oct 6 | NABTEB QUESTIONS
(i) Upsetting This is a foregoing operation in which the material being forged is thickened or bulged and at the same time shortened. A bar of iron may be upset by heating the end to a welding heat; then placing its hot end down on the top of the anvil and striking...
by Sunday | Oct 6 | NABTEB QUESTIONS
(i) To relieve internal stresses (ii) To soften the material
by Sunday | Oct 6 | NABTEB QUESTIONS
(i) Tempering is often called drawing or drawing the temper. It is heat treatment process which relieves internal strain in hardened steel and this increases it toughness. Steel can be tampered by heating it to a temperature below the lower critical temperature and...
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