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Metal Inert Gas Welding

Welding · Level 4  ·  3 Chapters

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What Metal Inert Gas Welding covers

Metal Inert Gas Welding for Welding Level 4 begins at the drawing board and ends at the repair bench. You first interpret and draft working drawings, create welding symbols and develop an operation procedure. MIG welding then covers health and safety standards, hazards, safe handling of equipment, housekeeping, equipment and accessories, material preparation, welding parameters, modes of metal transfer, positions, joints and weld defects. The learner welds metal up to 10 mm thick in flat, horizontal and vertical positions and finishes the product. The last outcome covers identifying machines and tools that need maintenance, preventive maintenance and repair using the manufacturer's manual.

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Careers after Metal Inert Gas Welding

MIG welding is a common skill in workshops that produce steel products in quantity, and this unit builds it together with the drawing skills behind it.

  • Production workshops in Mombasa - you set MIG parameters, weld steel in flat, horizontal and vertical positions and finish products to the job standard after checking for weld defects.
  • Drafting and planning desks at engineering firms in Thika - you draft working drawings, set out dimensions, apply welding symbols and write operation procedures for welders to follow at the machine.
  • Equipment care crews in Machakos - you identify MIG machines and tools that need attention, carry out preventive maintenance and repair tools from the manufacturer's manual.
  • Owner-operated welding shops in Nyeri - you take a customer's drawing, choose joints and positions, check for weld defects and run the shop safely, including housekeeping and safe handling of equipment.

Each of these roles uses the same chain: drawing, procedure, weld and maintenance.

Chapters

1
Draft working drawing
28 topics
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2
Carry out Metal Inert Gas (MIG) welding
87 topics
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3
Maintain MIG welding machines, tools and equipment
10 topics
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What Metal Inert Gas Welding covers: 20 main topics in 3 chapters

1. Draft working drawing

  1. 1.1 Drawing interpretation
  2. 1.2 Draft work drawings
  3. 1.3 Operation procedure

2. Carry out Metal Inert Gas (MIG) welding

  1. 2.1 Occupational health and safety standards
  2. 2.2 Welding hazards
  3. 2.3 Safe handling of equipment
  4. 2.4 Housekeeping
  5. 2.5 Interpretation of working drawing
  6. 2.6 MIG welding equipment and accessories
  7. 2.7 MIG welding tools
  8. 2.8 Welding material preparation (steel up to 10 mm thickness)
  9. 2.9 MIG welding parameters
  10. 2.10 Modes of metal transfer
  11. 2.11 Metallic Materials (up to 10 mm thickness)
  12. 2.12 Welding positions
  13. 2.13 Types of joints
  14. 2.14 Weld defects
  15. 2.15 Finishing processes

3. Maintain MIG welding machines, tools and equipment

  1. 3.1 Welding tools repair
  2. 3.2 Preventive maintenance of fabrication machines and equipment

Practise this unit

The practical 39 The assessment itself: tools, materials and the marks Step-by-step guide 39 PPE, each step, what good looks like, common mistakes

Revise this unit

Exam-style questions 42 Written to CDACC standard, with answers Test yourself 118 Multiple-choice, one at a time Practise questions 62 Quick recall — check you know the facts
3 more for this unit
Oral exam preparation 29 What the assessor asks, and how to answer out loud Worked calculations 15 Step-by-step maths with the common mistakes Quick cards 587 Myth busters, skill tips and scenarios

Beyond the syllabus

Decision simulator 3 On site, what would you do? Workplace scenarios 40 Real site situations — what would you do? Turn this into income 24 Where this skill earns — what to charge, how to find clients

Other units in Module II