Submerged arc flux: ensure welding quality and reliability

Submerged arc flux is a kind of welding material used for Submerged arc welding, which is usually composed of ferroalloys and metal compounds. The main function of submerged arc welding flux is to protect the welding process, improve the welding strength and stability, and reduce welding defects.

1.The selection of submerged arc welding flux shall generally consider the following requirements:

Good metallurgical properties: submerged arc welding flux shall have appropriate chemical composition and physical properties to adapt to the strength, high plasticity and toughness of the base metal, and strong cold and hot crack resistance.

Good process performance: submerged arc welding flux shall have good arc combustion stability and proper viscosity and surface tension of slag. It should be able to form a good molten pool, allowing complete fusion between weld beads and between weld beads and base metal, with a smooth surface and no defects such as undercuts, easy slag removal, and minimal environmental pollution during the welding process.

Appropriate particle size and particle strength: submerged arc welding flux shall have certain particle size and particle strength to ensure good coverage and protection effect.

Good anti porosity performance: submerged arc welding flux shall be able to effectively prevent the formation of pores and improve the reliability of welding quality.

Good corrosion resistance: submerged arc welding flux shall have good corrosion resistance to ensure that it will not be affected by the corrosion of external environment during welding.

2.The commonly used submerged arc welding fluxes mainly include the following types:

Slag type submerged arc welding flux: slag type submerged arc welding flux refers to the slag formed at high temperature that can protect the welding arc and molten pool. This type of flux is usually composed of ferroalloys, metal compounds, and slag forming agents, which have good protective effects and process performance.

Sintered submerged arc flux: Sintered submerged arc flux refers to the submerged arc flux made by high-temperature sintering. This type of flux is usually composed of ferroalloys, metal compounds, slag forming agents, and binders, which have good protective effects and process performance.

Bonded submerged arc flux: Bonded submerged arc flux refers to the submerged arc flux formed by bonding various solid powder materials with adhesives. This type of flux is usually composed of ferroalloys, metal compounds, slag forming agents, and binders, which have a faster molten pool formation speed and good protective effect.

Flux cored submerged arc flux: Flux cored submerged arc flux refers to the submerged arc flux made by filling powder in steel pipe or steel sheet. This type of flux is usually composed of ferroalloys, metal compounds, slag forming agents, and binders, which have good protective effects and process performance.

The selection of suitable submerged arc welding flux requires comprehensive consideration according to specific welding requirements and conditions, such as the type, thickness, structural form of base metal, welding process and method and other factors. At the same time, in order to ensure welding quality and reliability, it is also necessary to pay attention to selecting appropriate process parameters such as welding current, voltage, and welding speed.