Lesson Notes By Weeks and Term v4 - SHS 2
WELDING TECHNOLOGY
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WELDING TECHNOLOGY
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Subject: Applied Technology
Class: SHS 2
Term: 1st Term
Week: 14
Grade code: 2.2.2.LI.2
Strand code: 2
Sub-strand code: 2
Content standard code: 2.2.2.CS.1
Indicator code: 2.2.2.LI.2
Theme: METAL TECHNOLOGY
Subtheme: WELDING TECHNOLOGY
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Welcome, future engineers and technicians! Before we can weld pieces of metal together to create something useful like a school gate, a burglar-proof window, or a metal container, the metal itself must first be shaped. Have you ever wondered how a thick block of steel is turned into a thin roofing sheet, or how a solid cylinder of aluminium becomes a long, complex window frame? Today, we will explore three fundamental processes used to shape metal: Forging, Rolling, and Extrusion. These are not welding processes, but they are crucial pre-welding steps in metal technology. Understanding how metal gets its initial shape is essential for any skilled metalworker.
Introduction to Metal Forming
Metal forming is the process of changing the shape of a metal workpiece through plastic deformation without adding or removing material. The force applied must be greater than the metal's elastic limit to create a permanent change in shape. These processes can be done "hot" (when the metal is heated to make it softer and easier to shape) or "cold" (at room temperature).
We will focus on three key types: Forging: Shaping by hammering or pressing. Rolling: Shaping by squeezing through rollers. Extrusion: Shaping by pushing through a die.
A. Forging