Exothermic welding
Exothermic welding is a simple, high efficiency and high quality method of metal connecting.
Lihe exothermic welding uses high temperature reaction of powdered copper oxide and aluminum. The chemical equation is 2Cu2O+2Al=6Cu+Al2O3 ( the temperature can be in excess of 2500℃.) It is a method of welding copper, iron, steel and ferroalloy without outside power.
In order to weld different sizes conductor, a graphite mold is needed. It is only to put the conductor need welding in the mold, dump powder into the mold, ignite the starting powder, than the reaction takes place. Open the mold when it is cold, thus the conductor connection is finished. We supply different connections and the matched mold and welding powder.
Characteristics
Good current loading ability
The welding point current loading ability is the same as conductor.
Good mechanical performance
The connection is a molecular connection. It is a permanent connection.
Stable dash current resistance
The test shows that in the surge of big current in short time, the conductor melts earlier than the connection point, so it will not be damaged by surge current.
Good resistance to corrosion
The welding point is covered by copper, it provides good resistance to corrosion.
Simple and safe connection
Neither outside power nor facility is required. It requires very little time to finish one welding. It can be done both indoor and outdoor.
Free control the reaction temperature
Different welding powder is provided according to the metal features, so the welding powder can be very solid.
Range of application
It is widely used in lightning protection and grounding and surge protection projects, equipment grounding, petrochemical projects, airport and expressway construction.
Making a exothermic welding connection
1. Make sure the mold is dry, by pre-heating, put the cleaned conductors in mold.
2. Place metal disc in bottom of mold crucible and close the mold.
3. Dump welding powder into crucible, and place starting powder in the ignition pocket.
4. Close lid, ignite the starting powder with the flint gun.
5. Reaction takes place in the graphite mold.
6. Open the lid when it is cold. The welding connection is done.
Notice
First, develop the correct mold according the conductor and the connection way, also provide the matched welding powder. Second, before welding, clean the conductor. Third, pre-heating mold. Forth, in the welding operation scene, no inflammable articles within 2 meters distance. Fifth, the operator must wear gloves. Sixth, clean mold after welding finishing, for next connection. Seventh, molds should last for 50-80 welds if proper care is given.
