4.3 Manual Metal Arc- Welding

• Meaning of manual metal arc welding as a thermal joining process
• Tools and equipment used in manual metal arc welding
• Welding rods (electrodes), their parts and sizes
• Personal protective equipment used during manual metal arc welding
• Safety measures to be observed during manual metal arc welding
• Setting up manual metal arc welding equipment
• Straight polarity and reverse polarity
• Starting an arc: scratch start and tap start
• Flat position welding
• Horizontal position welding
• Types of welded joints
• Common weld defects and their causes
• Inspection and testing of welds
• Maintenance of manual metal arc welding tools and equipment
• Relevance of manual metal arc welding in solving everyday practical problems

• describe manual metal arc welding as a thermal joining process in metalwork
• perform manual metal arc welding for a given task in a metal workshop
• maintain manual metal arc welding tools and equipment in the workshop
• reflect on the relevance of manual metal arc welding in solving everyday practical problems

“What is manual metal arc welding?”

“How is an arc started and a weld made safely?”

“What is the importance of manual metal arc welding in society?”

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1. Manual metal arc welding: an introduction
   40 min · 1 practice tasks · quiz
   Describe manual metal arc welding as a thermal joining process in metalwork.
2. Tools and equipment for arc welding
   40 min · 1 practice tasks · quiz
   Identify the tools and equipment used in manual metal arc welding.
3. The welding electrode
   40 min · 1 practice tasks · quiz
   Describe the parts, sizes and choice of welding electrodes.
4. Personal protective equipment
   40 min · 1 practice tasks · quiz
   Identify and use the personal protective equipment for arc welding.
5. Safety in arc welding
   40 min · 1 practice tasks · quiz
   Describe the safety measures to be observed during manual metal arc welding.
6. Setting up the arc welding equipment
   40 min · 1 practice tasks · quiz
   Set up manual metal arc welding equipment for a given task.
7. Straight polarity and reverse polarity
   40 min · 1 practice tasks · quiz
   Explain straight polarity and reverse polarity in arc welding.
8. Starting the arc
   40 min · 1 practice tasks · quiz
   Start an arc correctly by the scratch and tap methods.
9. Flat position welding
   40 min · 1 practice tasks · quiz
   Weld in the flat position with a steady bead.
10. Horizontal position welding
    40 min · 1 practice tasks · quiz
    Weld in the horizontal position on a vertical surface.
11. Types of welded joints
    40 min · 1 practice tasks · quiz
    Describe the main types of welded joints and their preparation.
12. Weld defects and their causes
    40 min · 1 practice tasks · quiz
    Identify common weld defects and the faults that cause them.
13. Inspecting and testing welds
    40 min · 1 practice tasks · quiz
    Inspect and test a weld so that weak joints are found.
14. Maintenance of arc welding tools and equipment
    40 min · 1 practice tasks · quiz
    Maintain manual metal arc welding tools and equipment in the workshop.
15. Importance of arc welding in society
    40 min · 1 practice tasks · quiz
    Reflect on the relevance of manual metal arc welding in everyday life.
16. Performing manual metal arc welding: a task
    40 min · 1 practice tasks · quiz
    Carry out manual metal arc welding for a given task in the workshop.