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: 16
Grade code: 2.2.2.LI.6
Strand code: 2
Sub-strand code: 2
Content standard code: 2.2.2.CS.1
Indicator code: 2.2.2.LI.6
Theme: METAL TECHNOLOGY
Subtheme: WELDING TECHNOLOGY
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Soldering is a fundamental skill in metal technology that allows us to join metal parts together without melting them. In Ghana, this skill is visible everywhere – from the local technician fixing a mobile phone or radio in Makola Market, to the plumber joining copper pipes for a new house in Kumasi, to the artisan crafting beautiful brass ornaments in Koforidua. Understanding soldering opens up opportunities for repair, creation, and entrepreneurship. This lesson will introduce you to the two main types of soldering – soft and hard – and the tools and safety measures required to perform them correctly.
A. What is Soldering?
Soldering is a joining process used to connect metal pieces together by melting and flowing a filler metal, called solder, into the joint.
Key Principles: Lower Melting Point: The solder always has a lower melting point than the metal pieces being joined (the base metals). No Melting of Base Metal: Unlike welding, the base metals themselves are not melted. The solder acts like a strong metallic glue. Capillary Action: The solder is drawn into the small gap between the two closely fitted parts through a process called capillary action, creating a strong bond when it cools and solidifies. B. The Role of Flux
You cannot get a good solder joint on a dirty or oxidised surface. Flux is a chemical cleaning agent used before and during soldering.