... "WHVRI" with the inspection report. Estweld exothermic power/Exothermic welding flux have got patent from State Intellectual Property Office of ... the People's repubilic of China.The main welding heat can be welded copper, brass, bronze, copper, ... other metal materials.we developed an upgraded version of exothermic welding products-ESTweld plus.Stable quality and reliable performance leading ...