What is the effect of molten low manganese high silicon medium fluorine flux on welding performance?
Publish Time: 2025-04-09
Molten low manganese high silicon medium fluorine flux is widely used in the field of welding, and its composition and characteristics have a multi-faceted and important influence on welding performance.From the perspective of weld metal composition, the content of silicon dioxide (SiO₂) in the flux is relatively high, which can transition silicon elements to the weld. Silicon plays a role of solid solution strengthening in weld metal, which can improve the strength and hardness of the weld, but too high a content will reduce the toughness of the weld and make it easy to fracture brittlely in a low temperature environment. The content of manganese oxide (MnO) affects the transition of manganese in the weld. The transition of manganese varies significantly with the different MnO content in the flux. Appropriate amount of manganese can deoxidize and desulfurize, and improve the toughness and crack resistance of the weld. Calcium fluoride (CaF₂), as a characteristic component of medium fluorine flux, can stabilize the arc, reduce spatter, reduce the hydrogen content of the weld metal, and improve the ability to resist cold cracking.In terms of welding process performance, the flux has good arc stability and stable arc burning, which can ensure the continuity of the welding process and reduce welding defects. The slag removal performance is excellent, and the slag is easy to remove after welding, which reduces labor intensity and improves welding efficiency. The weld bead is beautiful, the weld surface is smooth and uniform, and the workload of subsequent grinding is reduced.However, some issues should be noted when using this flux. For example, the surface of the parent material needs to be strictly treated before welding to remove impurities such as oil and rust, otherwise it is easy to produce defects such as pores and slag inclusions. The flux needs to be baked at 300-350℃ for 2 hours before use to remove moisture and avoid hydrogen pores during welding.In addition, when welding acid-resistant stainless steel structures, high chromium-nickel welding wire is required to avoid burning of alloy elements and ensure the corrosion resistance of the weld metal. In applications such as roller surfacing, the welding parameters should be adjusted according to the specific working conditions to optimize the matching of the flux and the welding wire to obtain the best surfacing layer performance.Molten low manganese high silicon medium fluorine flux has a significant impact on welding performance. Reasonable use can improve welding quality and efficiency, but attention should be paid to relevant process requirements and precautions.
