Application of Rich Ar Gas Shield Welding with Metal Powder Cored Wire on Rock Bit Ma Ziqiang Yang Hanmin Wu Jian Engineer, New Material Division, Kingdream Public Ltd. Co., QianJiang 433124, China.This paper introduces the main characteristics of rich Ar mixed gas shield welding with metal powder cored wire, and then designs and experiments on welding parameters, obtains optimum welding specification for this method application on the welding of rock bit assembling, at last, analyses the cost of producing.welding of rock bit assembling; metal powder cored wire; rich Ar mixed gas shield welding