Welding flux for surfacing of low-alloy high-strength steel

The invention discloses a flux for surfacing of low-alloy high-strength steel, which is composed of the following components in parts by weight: 8-30 parts of rosin modified phenolic resin, 10-20 parts of rosin glycerol ester, 10-20 parts of organic solvent, 10-20 parts of surfactant, 10-20 parts of activating agent, 10-20 parts of film-forming agent, 10-20 parts of amine hydrochloride, 10-20 parts of dead burnt magnesia, 10-20 parts of ferrosilicon alloy, 10-20 parts of manganese ore and 10-20 parts of potassium sodium water glass. And 6-9 parts of glycerol ester of rosin. Through the rosin modified phenolic resin, the rosin glyceride, the organic solvent, the surfactant, the activating agent, the film-forming agent, the amine hydrochloride, the dead burnt magnesia, the ferrosilicon alloy, the manganese ore and the potassium-sodium water glass, mineral raw materials are adopted, and special alloy is added, so that the prepared welding flux has excellent low-temperature impact toughness, residues are easy to