Gas shielded welding wire as well as preparation method and application thereof

The invention provides a gas shielded welding wire and a preparation method and application thereof, and belongs to the technical field of special welding materials. The invention provides a gas shielded welding wire. The gas shielded welding wire comprises the following chemical components in percentage by mass: 0.03-0.06% of C, 0.20-0.40% of Si, 1.00-1.40% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.1-0.6% of Ni, 0.10-0.30% of Mo, 0.20-0.40% of Cu, 0.02-0.06% of Ti, 0.01-0.05% of Ce, 0.01-0.05% of La, less than or equal to 0.03% of Zr, less than or equal to 0.003% of Mg, less than or equal to 0.03% of Sn and the balance of Fe. According to the invention, a Si-Ni-Mo-Cu-Sn alloy system is adopted, so that the corrosivity of a matrix and a grain boundary is improved; and the low-temperature toughness of the welding wire is improved by optimizing alloy elements. 本发明提供了一种气保护焊丝及其制备方法和应用，属于特种焊接材料技术领域。本发明提供了一种气保护焊丝，化学成分按质量百分比计包括C0.03～0.06％、Si 0.20～0.40％、Mn 1.00～1.40％、P≤0.012％、S≤0.