Why solder flux is needed for submerged arc welding?
First of all, submerged arc welding is also arc welding. Arc welding is characterized by the melting of metals. In the process of metal melting, if there is no separation from the air, there will be excess oxides in the weld, alloy elements are reduced, there are many nitrides and so on. In order to reduce the harmful effects of oxygen and nitrogen, the molten metal must be separated from the air during welding. The separation of liquid metal from air by means of gas and slag produced by flux.
Used to protect the welding pool from oxidation, and the same role as the electrode coating.
First of all, submerged arc welding is also arc welding. Arc welding is characterized by the melting of metals. In the process of metal melting, if there is no separation from the air, there will be excess oxides in the weld, alloy elements are reduced, there are many nitrides and so on. In order to reduce the harmful effects of oxygen and nitrogen, the molten metal must be separated from the air during welding. The separation of liquid metal from air by means of gas and slag produced by flux.Role of welding flux:1) improve the electric conductivity of arc, make arc easy, stable arc;2) to form molten slag, to protect the transition droplets, to protect the molten pool, to cover the upper surface of the bead, and to avoid the excessive cooling of the weld;3) the metallurgical effect on the dissolution bath, between the metal and slag, through the ferromanganese and ferrosilicon reaction deoxygenation;4) alloying action, adding Si and Mn, Cr, Ni, Mo and other elements.
