Effects of Shielded Gas on Microstructures and Properties of High Strength Steel Deposits
The microstructures and properties of high strength steel deposits under different shielded gases were investigated.The results indicate that the microstructures of deposits are mainly acicular ferrite and have good strength and excellent toughness when welded with Ar+(5~20)%CO2 mixed gas.The microstructures are mainly lath-shaped low carbon martensite when welded with pure argon gas.The strength of deposits is further improved but the plasticity and toughness decrease slightly.