The process of exothermic welding is a method of making electrical connections of copper-to-copper or copper to steel in which no outside source of heat or power is required. In this process, granular metallic particles are placed into a graphite mold and ignited. The reduction of these particles (exothermic reaction) creates high heat in excess of 1400 degrees Celsius and produces molten copper. The molten copper flows into the weld cavity, filling any available space and completes the weld. The weld should then be allowed to cool and solidify. The mold is removed and made ready for the next weld. This entire process takes only seconds to complete, but preparation and finishing can take from 10 to 20 minutes per connection.
Exothermically welded connections produce a joint that is superior in performance to any known mechanical or pressure type surface-to-surface contact connector. By virtue of its molecular bond, an exothermically welded connection will not become loose or increase in resistance over the lifetime of the installation.
We recommend that you contact our valued grounding professionals to obtain additional information about their services, capabilities and experience.
The average default price provided to the client for the labor portion of providing a professional exothermic weld is $29.44 each (6 welds or less; additional welds are priced accordingly). This does not include any material and is based upon an unobstructed working area. Any trenching, elevated work or other site-specific requirements should be priced accordingly.