The difference between exothermic welding and mechanical connection looks small, but in fact they are very different.
Exothermic welding is a simple, high-efficiency, high-quality metal connection process, which uses metal compound chemical reaction as a heat source, through superheated molten metal, direct or indirect heating work, forming a certain shape in the cavity of a special graphite mold The shape and size are in accordance with the welding needs of the project.
An exothermic welding connection is formed by thermal fusion, so the connection quality is very reliable and belongs to the molecular connection. The electrical conductivity at the connection is equal to or even better than that of the connected conductor itself. Therefore, its service life is equal to or even higher than that of the grounding system itself.
Exothermic welding does not require much maintenance, and can withstand repeated current shocks without attenuation. Once the mold is closed, the heat release process will be automatic and repeated.
On the other hand, in the mechanical connection, the connection is made by pressing, so it is only a contact connection. The conductivity of the connection point is lower than that of the conductor itself, and it is not tolerant to repeated inrush currents.
The mechanical connection will be impacted by repeated fault currents, and the connection operation requires manual compression by the operator. Need to manually adjust the equipment control part, and observe the welding process at any time. Mechanical welding relies heavily on human experience, so there are many problems.
Therefore, exothermic welding is a trend, safer and standardized. Exothermic welding has generally replaced the previous mechanical connection method between metals.
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The difference between mechanical welding and exothermic welding
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