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.4
Strand code: 2
Sub-strand code: 2
Content standard code: 2.2.2.CS.1
Indicator code: 2.2.2.LI.4
Theme: METAL TECHNOLOGY
Subtheme: WELDING TECHNOLOGY
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This lesson focuses on fundamental sheet metal forming operations: drawing, die, and press work. While part of the Welding Technology sub-strand, these processes are crucial pre-welding steps. Before we can join metal pieces (weld), we often need to shape them into specific forms. Think about the aluminium cooking pots ("sankwa") used in every Ghanaian kitchen, the body panels of a Kantanka car, or even a simple metal trunk box ("chop box"). These items are not made from flat sheets alone; they are pressed and formed into their final shape. Understanding these operations is essential for any future technician or engineer in the fabrication industry.
(Teacher models emotional self-control, patience, and clarity during explanation) A. Introduction to Sheet Metal Fabrication
Sheet metal fabrication is the process of building machines and structures from raw sheet metal. It involves cutting, bending, forming, and assembling (often through welding). Today, we focus on forming, which is changing the shape of the metal without removing any material. The main machine used for this is a Press. B. The Press and Die System
Imagine you are making "bofrot" and you use a round cutter to get a perfect circle from the dough. In metalwork, we use a much more powerful system: a press and a die. Press: A machine designed to apply a very high, controlled force (pressure) to a specific area. Presses can be small and manually operated, or huge and powered by hydraulics or electricity. Their job is to provide the "squeeze". Die Set: This is the custom tool that does the actual shaping. It works with the press. A die set has two main parts: Punch (Male part): This is the part that moves downwards and pushes into the metal. It has the shape of the desired internal feature (e.g., the inside of a cup). Die/Cavity (Female part): This is the stationary part that the metal is pushed into. It has a cavity with the shape of the desired external feature (e.g., the outside of a cup).
Analogy: The Press is like your arm providing the force. The Punch is like a pestle, and the Die is like the mortar for pounding fufu. The sheet metal is the yam in between! C. Key Press Operations Drawing (Specifically, Deep Drawing)