Low-alkalinity ocean engineering root welding rod

The invention provides a low-alkalinity ocean engineering root welding electrode which is composed of a coating and a core wire, and the coating comprises, by weight, 58%-62% of marble, 2%-3% of fluorite, 5%-8% of fluoride, 10%-15% of rutile, 1%-2% of lithium titanate, 1%-2% of titanium dioxide, 10%-12% of silica powder, 1%-2% of aluminum powder, 4%-8% of low-carbon ferromanganese, 4%-8% of 45% ferrosilicon and 1%-1.5% of CMC. The welding rod has excellent one-side welding and double-side forming root welding process performance and excellent mechanical performance, the tensile strength is larger than or equal to 550 MPa, and the requirement that the low-temperature impact toughness KV2 is larger than or equal to 50 J in the marine environment at the temperature of-40 DEG C is met. The welding rod has good wind resistance and can be suitable for severe construction environments on the seaside and on the sea. 本发明提供一种低碱度海洋工程根焊焊条，由药皮与焊芯组成，以重量百分比计，所述药皮包括大理石58%-62%，萤石2%-3%，氟化物5%-8%，金红石10%-15%，钛酸锂1%-2%，钛白粉1%-2%，硅微粉