4.2 Brazing

• Meaning of brazing as a thermal joining process in metalwork
• Difference between brazing, soldering and welding
• The principle of capillary action in brazing
• Tools and equipment used in brazing
• Oxy-acetylene equipment: cylinders, regulators, hoses, blowpipe and nozzle
• Oxy-acetylene flames: neutral, oxidizing and carburizing
• Types of brazing filler rods (spelter)
• Brazing fluxes and their functions
• Cleaning tools and preparation of the joint
• Safety precautions in brazing
• The procedure of brazing
• Heating the joint and applying the filler rod
• Joints used in brazing sheet metal
• Inspection of brazed joints for defects
• Maintenance of brazing tools and equipment
• Cleanliness before, during and after brazing
• Applications of brazing in day-to-day life
• Promoting brazing as a practical skill

• describe brazing as a thermal joining process in metalwork
• perform brazing for a given task in a metal workshop
• maintain brazing tools and equipment in the workshop
• promote the use of brazing as a practical skill in day-to-day life

“What is brazing?”

“What are the applications of brazing in day-to-day life?”

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1. Brazing: an introduction
   40 min · 1 practice tasks · quiz
   Introduce brazing as a thermal joining process used in the metal workshop.
2. Brazing, soldering and welding
   40 min · 1 practice tasks · quiz
   Compare brazing with soldering and welding.
3. How brazing works
   40 min · 1 practice tasks · quiz
   Explain the principle of capillary action and the correct joint gap.
4. Tools and equipment for brazing
   40 min · 1 practice tasks · quiz
   Identify the tools and equipment used in brazing.
5. The oxy-acetylene equipment
   40 min · 1 practice tasks · quiz
   Identify the parts of the oxy-acetylene equipment and how it is set up.
6. Oxy-acetylene flames
   40 min · 1 practice tasks · quiz
   Describe the neutral, oxidizing and carburizing flames and choose the right one.
7. Brazing filler rods
   40 min · 1 practice tasks · quiz
   Identify the types of brazing filler rods and select a suitable one.
8. Brazing fluxes
   40 min · 1 practice tasks · quiz
   Explain what a flux does and how it is used in brazing.
9. Cleaning and preparing the joint
   40 min · 1 practice tasks · quiz
   Prepare the surfaces and set the gap before brazing.
10. Safety in brazing
    40 min · 1 practice tasks · quiz
    Observe safety rules when using brazing tools and equipment.
11. The brazing procedure
    40 min · 1 practice tasks · quiz
    Describe the step by step procedure for making a brazed joint.
12. Heating the joint and applying the filler
    40 min · 1 practice tasks · quiz
    Heat the joint evenly and feed the filler so it fills the whole joint.
13. Joints for brazing sheet metal
    40 min · 1 practice tasks · quiz
    Identify the joints used in brazing sheet metal and choose the best one.
14. Inspecting brazed joints for defects
    40 min · 1 practice tasks · quiz
    Inspect brazed joints and identify common defects and their causes.
15. Maintaining brazing tools and equipment
    40 min · 1 practice tasks · quiz
    Care for and maintain brazing tools and equipment.
16. Cleanliness before, during and after brazing
    40 min · 1 practice tasks · quiz
    Keep the work and the workshop clean at every stage of brazing.
17. Applications of brazing in everyday life
    40 min · 1 practice tasks · quiz
    Describe the everyday and industrial uses of brazing.
18. Promoting brazing and reviewing work
    40 min · 1 practice tasks · quiz
    Promote brazing as a practical skill and review brazed work with peers.