What are the common methods to reduce the grounding resistance

At present, most of the grounding systems using copper-clad steel grounding rods and bare copper stranded wires have been widely used in the petrochemical industry, and the exothermic welding technology has been more and more used in the petrochemical industry, which solves the problems of high contact resistance value of grounding connection points, difficult resistance reduction, difficult on-site construction and short service life of grounding system in the construction of common grounding grid.