Abstract: The characteristics and feasibility of metal argon gas welding with coated solid-wire were researched.A nanometer composite coating was developed,which gave the wire a sound weldability during metal argon gas welding.The welding tests showed that the deposited metal with the coated solid-wire had higher mechanical poperties and cold cracking resistance because of its lower oxygen and diffusible hydrogen content compared to that of TIG welded.It could be concluded that metal argon gas welding with coated solid-wire could be a potential method to weld high strength steels with high efficiency and quality.