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 785 MPa-grade steel high-strength high-toughness argon tungsten-arc welding welding wire for marine engineering and an application thereof, and belongs to the technical fieldof welding materials. The chemical components (wt.%) of the welding wire comprises 0.02-0.07% of C, 0.20-1.20% of Cr, 5.0-8.0% of Ni, 0.30-0.90% of Mo, 0.7-1.50% of Mn, 0.20-0.50% of Si, less than orequal to 0.25% of V, and the balance iron and inevitable impurities. The welding wire is suitable for welding of marine engineering structural parts, during welding, the welding wire is small in splashing, stable in process and good in process performance. According to the high-strength and high-toughness argon tungsten-arc welding welding wire, welding seams which meet the requirement performance can be obtained.