Agglomerated Welding Flux BF 2.1

Flux type: Aluminate-Rutile

ISO 14174: S A AR 1 76 AC H5 *)

Datasheet English Safety data sheet English


BF 2.1 is an agglomerated welding flux with the characteristic of an Aluminate-Rutile Type. Designed for all SAW-processes and welding of ordinary carbon-manganese, low alloy structural and boiler quality steels with yield strength up to 355 MPa (t < 25 mm) in combination with wire grades S2, S2Si. The flux is suitable for high speed welding (up to 2.2 m / min.) and provides very good weld bead appearance and excellent slag release even with small angle preparation and fillet welds. The chemical nature of BF 2.1 flux provides high resistance to cracking on single pass applications. Additional features are resistance to porosity when welding rusty plates, heavy scale or other contaminations of plate surfaces (e.g. special primer-coatings) and low sensitivity to arc blow.


Preferentially used for single-run, two-run and fillet SA-welding. Main fields of application include structural steelwork, thin-walled containers, LP-gas cylinders and lightning towers.

Characteristic chemical constituents

SiO2 + TiO2 Al2O3 + MnO CaO + MgO CaF2
25 % 50 % 10 % 10 %
Basicity according to Boniszewski: ~0,8

Flux density: 1.0 kg / dm3 (l)
Grain size acc. to DIN EN 760: 4 – 14
Current-carrying capacity: up to 800 A (DC or AC) using one wire

*) Diffusible hydrogen content H5: determined in deposited metal acc. to the method described in ISO 3690
Type of current DC; redrying conditions 200 ± 50°C


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