FLUXES FOR EVERY SAW AND ESW APPLICATION
DAIKO has optimized a full range of welding fluxes formulated for the most demanding submerged arc and electroslag joining, cladding and coating applications.
The metallurgical behavior of a welding flux is described through its basicity which is expressed as the ratio between the basic compounds, the fluorides, and the acids, the oxides, with which it is made. The basicity index, B.I., identify introduced by Boniszewski, now universally used as a reference, allows for three macro-categories of fluxes: rutile B.I. <1, semi-basic 1 3.
The rutile fluxes optimize the speed of advancement and facilitate the drafting of the weld pool, consequently they are mainly used to increase the productivity and aesthetics of the bead. The low hydrogen content typical of basic and semi-basic flows allows to obtain joints with high toughness for single-pass, multi-pass, single-wire, tandem, twin-arc or multi-wire applications. The relationship between basicity and toughness is particularly important for highly alloyed grades, such as duplex steels.
The electroslag process does not require the presence of an electric arc, except during ignition, and therefore requires special fluxes with specific resistivity capable of maintaining the passage of current and melting the base material and consumables due to the Joule effect. Given these characteristics, submerged arc fluxes have very low metallurgical actions on the weld pool.
