Multi-element environment-friendly smelting flux for welding low alloy steel and preparation and application thereof

The invention relates to the technical field of welding, in particular to a multi-element environment-friendly smelting flux for welding low alloy steel and preparation and application of the multi-element environment-friendly smelting flux. The multi-element environment-friendly smelting flux for welding the low alloy steel is prepared from the following components in percentage by mass: 52%-60% of CaO, 12%-19% of ZrO2, 13%-19% of SiO2, 3%-8% of Al2O3 and 8%-15% of MnO. Components of the multi-element environment-friendly smelting flux for welding the low-alloy steel do not contain calcium fluoride, so that the multi-element environment-friendly smelting flux is more environment-friendly, and the accuracy of the components of the smelting flux is In addition, the multi-element environment-friendly smelting flux for welding the low alloy steel has the advantages of being high in alkalinity, reasonable in flux oxygen potential and oxygen content of weld metal, good in post-welding deslagging performance and th