本发明公开了一种大线能量钢专用焊丝及制备方法，该焊丝由外皮钢带和药芯组成，该药芯组成和含量为：氟化物3‑5重量份、硅铁粉5‑10重量份、铝铁粉1‑3重量份、锰铁粉6‑10重量份、镍粉8‑12重量份、钛酸钾1‑5重量份、电熔镁砂0.2‑1.0重量份、钼铁1‑10重量份、长石粉5‑10重量份、铁粉40‑55重量份。与现有的相比，本发明焊接工艺性能良好，电弧稳定、飞溅小、焊缝成型美观等目的；性能上达到良好的‑40℃低温冲的目的。

The invention discloses a welding stick special for high-heat input steel and a preparation method. The welding stick is composed of an outer steel belt and a flux core. The flux core comprises, by weight, 3-5 parts of fluoride, 5-10 parts of ferrosilicon powder, 1-3 parts of aluminum and iron powder, 6-10 parts of ferromanganese powder, 8-12 parts of nickel powder, 1-5 parts of potassium titanate, 0.2-1.0 part of fused magnesite, 1-10 parts of ferro-molybdenum, 5-10 parts of feldspar powder and 40-55 parts of iron powder. Compared with the prior art, the welding stick special for the high-heat input steel and the preparation method achieve the purposes that the welding process performance is good, electric arcs are stable, spattering is small and the weld appearance is attractive; and on performance, the purpose of good -40 DEG C low-temperature impact toughness is achieved.