Views: 208 Author: SEPPE Publish Time: 2023-04-26 Origin: https://www.seppe.cn/
Fluxes are divided into three types: acidic, neutral, and alkaline, and are classified into melted flux and non melted flux according to manufacturing methods.
The flux obtained by mixing various mineral raw materials, mainly manganese ore, silica sand, bauxite, magnesium ore, fluorite, quicklime, ilmenite and other chemical products, cryolite, borax and other chemical products, into furnace charge according to the formula ratio, heating them in an electric furnace or flame furnace to more than 1300 ℃, melting evenly, discharging them, water cooling granulation, drying and screening is called smelting flux.
The main function of sintered flux in submerged arc welding is to create slag, which isolates air and controls the chemical composition of the weld metal, ensures the mechanical properties of the weld metal, and prevents the generation of defects such as pores, cracks, and slag inclusions.
Fluorite, as a solvent, determines whether the formed surface of the weld bead is beautiful and regular.
When the CaF2 content is low, the slag fluidity is poor, the weld seam is narrow and the undercut is severe; when the CaF2 content is too high, the molten droplets are too thin, and the wall of the "cavity" in the arc will be difficult to maintain stably, which is easy to cause damage to the "cavity". At the moment of damage to the "cavity", air will be injected into the arc area, and the weld seam will show pitting.