Skip to main content

Please Select Your Country/Language Preferences

nVent ERICO Cadweld History

We trace our roots back to 1903 — a time when very few homes or businesses even had electricity — with the founding of the Electric Railway Improvement Company (ERICO). The company in 1939 patented its Cadweld exothermically welded connection, an invention that paved the way for rail car companies to make repairs to rail tracks without large welding equipment. More than 100 million nVent ERICO Cadweld connections are now installed in a broad array of applications around the globe.



  • 1903

    The Electric Railway Improvement Company (ERICO) was formed to manufacture power bonds, signal bonds and related welding equipment.

  • 1938

    Dr. Charles A. Cadwell of the Electric Railway Improvement Company invents the Cadweld process – a copper-based, exothermic process for welding copper conductors to steel rails.


  • 1949

    Cadweld process is introduced for Cathodic Protection applications, specifically formulated to provide minimum heat effect on steel, which is especially important on thin-wall, high-stress pipes.

  • 1951

    Adapted the Cadweld process for use in grounding connections adapting the time savings from rail applications for streamlining commercial installations

  • 1959

    nVent ERICO Cadweld One Shot developed – a disposable mold for one time use in connecting a copper conductor to conductor and conductor to a ground rod

  • 1988

    nVent ERICO Cadweld Exolon introduced for low emission welding connections for sensitive indoor applications with electronic ignition and ceramic filters


  • 2003

    nVent ERICO Cadweld Plus introduced as first exothermic welding system with self-contained welding material with electronic ignition

  • 2014

    nVent ERICO Cadweld is first connection type to pass IEEE 837-2014 requirements for substation grounding – the most rigorous grounding connection qualification testing

nVent ERICO Cadweld.jpg


  • 2020

    Next generation nVent ERICO Cadweld Plus products, including the nVent ERICO Cadweld Plus Impulse Exothermic Welding Control Unit, improve on system safety and ease-of-use.

Erico Cadweld

Learn more with our Blog

Stay up to date with the latest whitepapers, developments, and tips from our experts by visiting our blog 


The latest in nVent ERICO Cadweld

Learn more about the features that will save you time, money, and keep your worksite safe.