Welding Safety and Practice

Overview

Students investigate why welding is used in engineering, compare common welding processes, and identify the equipment, hazards and controls involved. This is a classroom-based theory lesson: no live welding is undertaken.

Learning intentions

• Students will explain what welding is and why it is used in engineering.
• Students will distinguish between common welding processes.
• Students will identify essential personal protective equipment and workshop controls.
• Students will interpret a simple welded-joint diagram and describe a safe work sequence.

Success criteria

• I can describe welding as a permanent joining process using heat, pressure or both.
• I can name at least two welding processes and give one suitable use for each.
• I can match common welding hazards with appropriate control measures.
• I can sequence the main stages of preparing for a safe welding task.

Curriculum links

• Engineering materials and manufacturing processes.
• Workshop safety, risk assessment and responsible use of equipment.
• Technical communication through diagrams, labels and structured explanations.
• Official IE Curriculum alignment could not be verified from available authoritative curriculum evidence; this lesson is therefore a useful topic-level plan rather than a claim of alignment to a specific outcome or descriptor.

Lesson structure (60 minutes)

1. 0–5 minutes – Hook and prior knowledge Open with the welding hook image and question: “How can two separate steel parts become stronger than a bolt or adhesive connection?” Students write an initial answer, then briefly share with a partner. Emphasise that welding is powerful but potentially dangerous when controls are ignored.

2. 5–15 minutes – What welding does Use the welding definition and joint diagrams to explain that welding creates a permanent joint by joining materials at or near their melting point, sometimes with pressure and filler material. Introduce butt, lap and fillet joints using clear diagrams. Ask students to identify where the joint is located and why joint design matters.

3. 15–25 minutes – Compare welding processes Present the process comparison slides covering arc welding, MIG/MAG welding, TIG welding and resistance spot welding at an age-appropriate overview level. Students complete the process table on the welding processes and safety worksheet, recording the heat source, likely appearance or feature, and one engineering application. Avoid requiring students to memorise detailed settings or specialist terminology.

4. 25–35 minutes – Hazards and controls Display the hazard-spotting photographs. In pairs, students identify hazards such as ultraviolet radiation, hot metal, sparks, fumes, electric shock, compressed gases, fire and poor housekeeping. They complete the matching section of the welding processes and safety worksheet, linking each hazard to controls such as suitable eye and face protection, protective clothing, ventilation, fire prevention, equipment inspection and safe storage.

5. 35–47 minutes – Safe-work sequence Model a safe preparation routine using the safe-work sequence. Groups arrange the stages verbally: assess the task, inspect equipment, clear and protect the work area, check ventilation, select PPE, secure the workpiece, confirm settings under teacher supervision, weld only when authorised, and shut down and inspect the area. Students then write the sequence in their own words on the welding processes and safety worksheet. Reinforce that students must never operate welding equipment without qualified supervision and local workshop procedures.

6. 47–55 minutes – Engineering decision task Give each pair one scenario from the application scenarios: repairing a mild-steel frame, joining thin sheet, making a neat visible joint, or producing repeated spot joints. Pairs choose the most suitable process from those studied and justify their choice using material, joint, finish, access and safety considerations. Take brief whole-class responses and challenge unsupported choices with “What evidence led you to that decision?”

7. 55–60 minutes – Plenary and assessment Use the recap and exit questions. Students answer three questions on the worksheet: define welding, name two hazards and controls, and explain one reason a process might be selected for a particular job. Invite several students to share answers and correct misconceptions before collecting the worksheets.

Resources

• the welding safety and processes slide deck
• the welding processes and safety worksheet
• Projector or interactive display
• Images or diagrams of welded joints and workshop hazards
• Whiteboard and markers
• Pens or pencils
• Sample PPE, if available, for teacher demonstration only
• School workshop safety rules and risk-assessment procedure
• No live welding equipment is required for this lesson

Assessment

• Check students’ process comparison tables for accurate distinctions and suitable applications.
• Circulate during hazard identification and question students about why each control is necessary.
• Use the final three worksheet questions to assess understanding of welding, hazards and process selection.

Differentiation

• Provide a word bank with terms including joint, filler, electrode, arc, ventilation, PPE, hazard and control.
• Use labelled diagrams and sentence starters such as “This process may be suitable because…” for students requiring language or literacy support.
• Pair students strategically and allow oral responses before written recording; read worksheet instructions aloud for students with additional learning needs.
• Extend confident students by asking them to compare two processes for the same job and explain the trade-off between finish, speed, equipment and safety.