Seamless flux-cored wire and preparation method thereof

The invention provides a seamless flux-cored wire and a preparation method thereof, and particularly relates to the field of welding materials. The seamless flux-cored wire comprises a steel strip sheath and a flux core filled in the steel strip sheath, and the flux core comprises the following raw materials in percentage by weight: 30-50% of rutile, 2-4% of potassium titanate, 2-4% of feldspar, 1-3% of quartz, 8-12% of manganese-silicon alloy, 6-10% of low-carbon ferromanganese, 1-2% of aluminum-magnesium alloy, 1.5-3% of aluminum-iron, 10-12% of nickel powder, 2-3% of ferromolybdenum, 1.5-3% of sodium fluoroaluminate and 2-3.5% of ferrotitanium. 0.2-0.6 wt% of low-boron iron, 1-2 wt% of calcium zirconium lanthanum, and the balance of iron powder. According to the seamless flux-cored wire, during welding, electric arcs are stable, splashing is little, the all-position welding process is excellent, deposited metal has excellent strength and low-temperature toughness, the diffusible hydrogen content is low, an