本发明公开了一种海洋工程用785MPa级高强高韧熔化极活性气体保护焊丝及其应用，属于焊接材料技术领域。该焊丝化学成分为(wt.％)：C：0.02‑0.06％、Cr：0.15‑0.60％、Ni：3.0‑6.5％、Mo：0.50‑0.80％、Mn：0.90‑1.30％、Si：0.30‑0.60％、V≤0.15％，余量为铁及不可避免的杂质。本发明焊丝适用于海洋工程结构件焊接，焊接工艺适应性好，焊接时飞溅小，过程稳定，焊缝成形好。本发明高强高韧熔化极活性气体保护焊丝能够获得性能符合要求的焊缝。

The invention discloses a 785MPa-class high-strength and high-ductility consumable electrode active gas-shielded welding wire used for marine engineering and application thereof, and belongs to the technical field of welding materials. The 785MPa-class high-strength and high-ductility consumable electrode active gas-shielded welding wire used for marine engineering comprises, by weight, 0.02%-0.06% of C, 0.15%-0.60% of Cr, 3.0%-6.5% of Ni, 0.50%-0.80% of Mo, 0.90%-1.30% of Mn, 0.30%-0.60% of Si, no more than 0.15% of V, and the balance ferrum and inevitable impurities. The welding wire is suitable for welding structural parts for marine engineering, the adaptability of the welding process is good, little splattering is caused during welding, the process is stale, and the formability of weld joints is good. The high-strength and high-ductility consumable electrode active gas-shielded welding wire can obtain weld joints with the performance meeting requirements.