The surface strengthening flux of roller should have good metallurgical properties, suitable welding wire and reasonable welding process. The weld metal should have suitable chemical composition, good mechanical properties (compatible strength with base metal, high plasticity and toughness), and strong resistance to cold crack and hot crack. The following is about the advantages of flux!
1. The flux should have good workability, stable arc combustion, suitable melting point, viscosity and surface tension. The welding seam has good shape, easy slag cleaning and less harmful gas produced in the welding process.
The flux should have a certain particle size and strength for repeated use. The particle size can be divided into two categories: 2.5-0.45mm (8-40 mesh) for general submerged arc welding and electroslag welding, and 1.25-0.28mm (14-60 mesh) for fine particles, which are suitable for semi-automatic or fine wire submerged arc welding. Among them, the fine particles smaller than the specified size are not more than 5%, and the coarse particles larger than the specified size are not more than 2%. The content of impurities and other impurities in the flux shall not be greater than 0.1% of the mass fraction of the flux.
3. The flux should have low water content and good moisture resistance. The water content shall not exceed 0.2%. The moisture absorption rate should not exceed 0.15% when it is released at 25 ℃ and 70% relative humidity for 24 hours. The above is the content of our introduction, I hope to help you with your questions!