Class: Junior Secondary School 3 (JSS3, JSS 3)
Term: 2nd Term
Week: 5 – 6
Age: 14 years
Duration: 45 minutes
Subject: Basic Science And Technology
Curriculum Theme: Basic Technology
Previous Lesson: Simple Woodwork Projects and Tools
Topic: Metal Work Projects – Metal Joining
Subject Matter: Methods of joining metals, Tools and materials used for joining metals

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:
(a) Explain the meaning of metal joining.
(b) Identify and describe methods used in joining metals.
Affective Domain:
(a) Show interest in metal work activities and safety practices.
(b) Appreciate the importance of proper metal joining in everyday tools and structures.
Psychomotor Domain:
(a) Demonstrate correct handling of basic metal joining tools.
(b) Perform simple metal joining procedures under supervision.
Social Domain:
(a) Work cooperatively in groups during practical demonstrations.
(b) Share tools responsibly with classmates.

Reference Materials

The following resources was used in planning this lesson:

9 Years Basic Education Curriculum
Lagos State Unified Scheme of Work for Junior Secondary Schools
Wikipedia – Brazing
Relevant Textbooks

Instructional Materials

The teacher will teach this lesson with the aid of:

Charts showing metal joining methods
Samples of joined metals
Rivets, bolts, and nuts
Pictures of welding and soldering processes
Chalkboard and chalk

Rationale for the Lesson

This lesson equips learners with basic technological skills and knowledge needed to understand how metal objects are constructed and repaired in daily life.

Prerequisite/Previous Knowledge

Pupils have prior knowledge of metals and their uses from earlier Basic Technology lessons and have seen joined metal objects in everyday life.

Lesson Content

Metal Work Projects – Metal Joining

Meaning of Metal Joining

Metal joining is the process of connecting two or more metal parts together to form a single strong unit. It is commonly used in making tools, machines, furniture, and buildings.

Methods of Joining Metals

Different methods are used to join metals depending on the type of metal and the purpose of the product.

The following are methods of joining metals:

Welding – joining metals by melting them together using heat.
Soldering – joining metals using a low melting metal called solder.
Brazing – joining metals using molten filler metal at high temperature.
Riveting – joining metals using rivets hammered into holes.
Bolting and Nutting – joining metals using bolts and nuts.

Tools and Materials Used for Joining Metals

Metal joining requires specific tools and materials to ensure strength and safety.

These include:

Welding machine
Soldering iron
Rivets
Bolts and nuts
Hammer
Protective goggles

Teaching Methods/Instructional Techniques:

Discussion, Explanation, Demonstration, Visual Aids, Group Work

Instructional Procedures

To deliver this lesson, the teacher will adopt the following steps:

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher asks pupils questions about metal objects they use daily and briefly reviews previous knowledge of metals.
Pupils’ Activity: Pupils respond to questions and mention examples of metal objects.
Learning Point: Metals are commonly used materials that can be joined together.

Step 2: Meaning of Metal Joining

Time: 8 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains the meaning of metal joining and gives everyday examples.
Pupils’ Activity: Pupils listen attentively and ask questions.
Learning Point: Metal joining is the process of connecting metal parts together.

Step 3: Methods of Joining Metals

Time: 12 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher explains and displays charts showing different methods of metal joining.
Pupils’ Activity: Pupils observe and identify methods shown.
Learning Point: Metals can be joined using various methods such as welding and riveting.

Step 4: Tools and Materials for Metal Joining

Time: 8 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher shows samples of tools and materials used for metal joining and explains their uses.
Pupils’ Activity: Pupils identify the tools and describe their uses.
Learning Point: Specific tools and materials are required for metal joining.

Step 5: Note-Taking

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher writes a summary of the lesson on the board for pupils to copy.
Pupils’ Activity: Pupils copy the notes into their notebooks.
Learning Point: Proper notes help in revision and understanding.

Step 6: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What is metal joining?
Mention three methods of joining metals.
List two tools used in metal joining.
Pupils’ Activity: Pupils respond to the questions.
Learning Point: Assessment helps to confirm understanding.

Step 7: Conclusion

Time: 2 minutes
Teaching Skill: Summary
Teacher’s Activity: The teacher summarizes the lesson and links it to future practical activities.
Pupils’ Activity: Pupils listen attentively.
Learning Point: Metal joining is an important skill in technology.

Lesson Keywords

Metal joining – connecting metal parts together
Welding – joining metals by melting
Riveting – joining metals with rivets
Soldering – joining metals using solder
Tools – equipment used for work

Differentiation

Use group work, visual aids, and simple explanations to support learners with different abilities.

Note for teachers using this lesson plan

Ensure safety precautions are emphasized when discussing metal joining tools and processes, even during demonstrations.