BF 4
Agglomerated Welding Flux
Description & applications
Versatile flux for joint welding and surfacing with wire or strip electrodes.
BF 4 is suitable for high speed welding of butt and fillet welds with single and multi wire processes. Smooth weld bead appearance with flat weld interfaces free from undercut, self de-slagging without any slag residuals, high current carrying capacity and low flux consumption (wire/flux ratio 1 : 0.8) are other special features of BF 4.
Uniform mechanical property performance and low diffusible hydrogen levels make BF 4 flux suitable for most of the SAW processes with its wide range of applications.
Classification
| EN 760 | ISO 14174 |
|---|---|
| SA AB 1 76 AC H5 | S A AB 1 76 AC H5 |
Typical weld metal composition (%)
| SiO2 + TiO2 | Al2O3 + MnO | CaO + MgO | CaF2 |
|---|---|---|---|
| 30 | 30 | 25 | 12 |
Packaging
25 kg PE-bags or 500-1250 kg Big-Bags
Application Instructions
Joint welding of non-alloy and low alloy structural steels such as S 355 J2 G3 (St 52-3N) acc. to EN 10025, boiler steels such as P265GH (H II) and 16Mo3/A335 Gr. P1, as well as fine-grain structural steels with yield strenght up to 420 N/mm² (t<50 mm) in combination with compatible wires such as S2 or S2Mo.
Surfacing with special hard facing wires and strips, including metal powder-cored wires (MPCW).
Metallurgical Behaviour
Flux Type
Aluminate-Basic
Flux Density
0.95 kg / dm³
Grain Size
2-20; Tyler 8 x 65
4-30; Tyler 6 x 35
Current-Carrying Capacity
1000 A (DC or AC) using one wire
Storage and redrying
The flux can be stored up to 3 years after delivery in dry storage rooms. Flux that has picked up moisture has to be redried at 150 to 250°C effective flux temperature.