Sintered flux for nickel base strip submerged arc welding

Abstract

The invention relates to sintered flux for nickel-based band electrode submerged-arc welding, and particularly discloses the sintered flux for nickel-based band electrode submerged-arc welding. The sintered flux is characterized by being prepared through dry powder compositions and binder water glass, the dry powder compositions include, by mass, 20% to 50% of CaF2, 20% to 40% of Al2O3, 10% of 20% of MgO, 5% to 10% of SiO2, 5% to 15% of CaO, 1% to 5% of sodium fluoride, 1% to 5% of rare earth fluoride and 1% to 5% of ferrocolumbium powder, and for the binder water glass, the ratio of kalium to natrium is 2 to 1, the modulus ranges from 2.4 to 3.5, the baume degree under a room temperature ranges from 39 to 45, and the weight of the binder water glass accounts for 20% to 30% of the weight of the dry powder. The sintered flux can be used in cooperation with EQNiCrMo-3, EQNiCr-3 and various nickel-based solder strips, when the sintered flux is used in cooperation with the nickel-based solder strips for band electrode submerged-arc welding, the stable built-up welding process and excellent welding process performance can be kept within a wide welding process parameter range, a built-up welding layer is excellent in forming quality, and all indexes of the built-up welding layer meet the use requirements of a user.

Description

technical field

[0001] The invention belongs to the field of welding materials, in particular to a sintered flux for submerged arc welding of nickel-based strip electrodes. The flux is mainly used with nickel-based welding strips to weld nickel-based corrosion-resistant protective layers on the inner walls of large containers such as urea equipment, nuclear containers, and coal chemical equipment. Background technique

[0002] Corrosion is one of the three main failure modes (wear, corrosion and fatigue) of mechanical components. Metal corrosion is a phenomenon in which the surface of a metal material undergoes a state change due to the action of the surrounding medium and transforms into a new phase or other substances, thereby gradually destroying the equipment. Corrosion problems are directly related to all fields of the national economy. The direct loss caused by corrosion to the alloy material is huge. According to statistics, about 100 million tons of corroded and s...

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