1. Locate the conductors (A) to be joined in the weld cavity (B) and close the mould (C).
2. Locate the steel retaining disc in the base of the crucible (D). Pour in the weld powder (E) followed by the starting powder (F).
Ignite starting powder with a spark gun.
3. The resulting exothermic reaction reduces the weld powder to molten copper alloy which melts the retaining disc and flows
into the weld cavity where it partially melts the conductors (G).
4. The molten copper alloy cools to leave a fusion weld of great mechanical and electrical integrity.

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The Exothermic weld moulds are made of a heat-resistant semipermanent graphite.
They comprises a crucible, tap hole and a weld cavity.
The high temperature thermic reaction takes place in the crucible of the moulds allowing molten copper to flow through the tap hole into the weld cavity, producing a solid joint.
They can be used for over than 70 connections under normal usage.
Graphite cover protects from the reaction projections.

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