The welding process is simple to operate, does not need external power source and heat source, and the welding cost is low, the quality is not random and reliable, the conductivity is the same as the base metal, it is very suitable for the field cable and other metal components welding, welding copper core cable and steel structure or copper core cable connection during the installation of cathodic protection system.

Exothermic welding began in the late 19th century, when H. Goldschmidt found that exothermic reaction between aluminum powder and metal oxide could be initiated by an external heat source, and once the reaction could be self-sustainable. The general formula for this reaction is:

Metal oxide + aluminum (powder) → alumina + metal + heat

Exothermic fusion welding can mainly weld pure copper, brass, bronze, copper, copper clad steel, pure iron, stainless steel, wrought iron, galvanized steel, cast iron, etc.

1. Characteristics and advantages of exothermic welding

(1) The current closure of the welding point is equal to that of the wire;

(2) The welding point is permanent and will not cause high resistance due to loosening or erosion;

(3) The solder joints are like copper, but are stronger than copper itself and are not affected by corrosive products;

(4) The welding point can withstand repeated large surge current (fault) without degradation;

(5) The welding operation method is simple and easy to use;

(6) The equipment is light and easy to carry;

(7) There is no need for external power or heat source during welding;

(8) The quality of welding can be verified from the appearance;

Can be used for welding copper, copper alloy, copper plated steel, all kinds of alloy steel including stainless steel and high resistance heating heat source material.

Exothermic welding (also known as thermite welding) is the use of exothermic reaction between metal oxide and metal aluminum to produce superheated molten metal to achieve the bonding method.

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