Exothermic welding is based on the reaction of copper oxide by metallic aluminum. The reaction is very exothermic, releasing a large amount of energy in the form of heat. It is produced through a starting reactant which provides enough energy to activate the welding reaction. This takes place quickly and safely inside a graphite mould. The most important one being that the process produces a molecular joint and not just a mechanical one in between the conductors.

Characters of exothermic welding:
-It has a superior electrical conductivity to the conductors themselves.
-It does not corrode, oxidize or degrade with time and is resistant to galvanic coupling.
-It is able to withstand repeated electrical discharges.
-It never increases its resistance.
-It has greater mechanical and squeezing resistance than the conductors themselves.
-It does not need extra energy (electrical source or heat source), only needs simple tools and equipment, and has high efficiency of operating.
-It is simple to learn how to operate in safe procedure, without professional knowledge and special protection.
-It is easy to check the welding quality by visual method
-It guarantees all types of common joints. Not only cooper cable unions but also to weld tapes, brass metallic pieces, stainless steel, steel ground rods covered by copper, etc.
-It does not produce any contamination and harmless to the environment.