How to perform Exothermic welding?

Cadwelding, a type of exothermic welding, permanently joins copper parts. It is often used in grounding systems and for connecting copper wires, rods, plates, and tubing.

Steps involved in Cadwelding:

  1. Preparation:
    • Clean the connection area free of any contamination, grease or paint.
    • Place the conductors in the appropriate graphite mold.
    • Prepare the welding powder based on the size and type of connection.
    • Place the ignition pill on top of the welding powder.
  2. Ignition:
    • Ignite the pill, initiating the intense heat of the thermite powder, melting and fusing the conductors together.
  3. Molding:
    • Allow the weld to cool after the conductors have melted.
    • The molten metal fills the mold and solidifies at the joint, creating a strong connection.
  4. Inspection:
    • Inspect the cooled weld for visible defects like cracks or porosity.

Advantages of Exothermic welding:

  • Ease of use: The process is simple, easy to learn, and requires no complex equipment or specialized skills.
  • Portability: Cadwelding equipment is portable and versatile.
  • Cadwelding is safer without flames or electric arcs..

Disadvantages of Cadwelding:

  • Cadwelding produces fumes and gases, so proper ventilation is needed.
  • It generates high heat, so be careful to avoid burns.
  • Limited use: Cadwelding only works with copper.

Safety precautions:

  • Wear safety gear: gloves, goggles, and a respirator.
  • Ensure proper ventilation.
  • Avoid wet or damp locations.
  • Reject defective welds.

Cadwelding is a reliable and effective welding method for joining copper conductors.

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