⑴ Oxygen Remover and nitrogen removal agent
Because nitrogen and oxygen can cause the weld metal to create pores or embrittlement, the flux must add manganese and silicon, such as oxygen removal agent, as for the self protection Flux cored wire, solder in the other need to add Al as a nitrogen removal agent. The above-mentioned addition of oxygen removal agent and nitrogen removal agent is to purify molten metal.
⑵ Solder Slag Forming agent
Calcium, potassium, sodium or silicon are solder slag forming agent, add in the flux can effectively protect the molten pool from air pollution, welding slag can make the appearance of better welding props and fast cooling and can support the full posture welding molten pool. The weld slag cover can reduce the molten metal cooling rate, which is especially important for the welding of low alloy steels.
⑶ Arc Stabilizer
Sodium and potassium can keep the arc soft and smooth and reduce splash.
⑷ Alloy Elements
The addition of alloying elements such as molybdenum, chromium, carbon, manganese, nickel and vanadium can improve the strength, ductility, hardness and toughness of molten metal.
⑸ Gas forming Agent
The fluorine stone, limestone and so on need to add in the self protection flux cored wire to cause the combustion to produce the protective gas.