BF 6.4
Agglomerated Welding Flux
Description & applications
A semi-basic flux suitable for high speed welding with single and multi-wire (up to 5 wires) submerged-arc processes. BF 6.4 is designed for pipe-welding and vessels of small diameter (> 300 mm) and is especially recommended for spiral pipe fabrication employing the two-run technique.
Weld bead performance and slag release are excellent providing flat welds with low reinforcement and flat weld interfaces free from undercut. The flux shows a high resistance to abrasion and a low consumption rate with good flux feeding properties in the transport and recovery system.
As a result of low hydrogen levels (max. 5 ml/100g), oxigen levels of about 350 ppm and low nitrogen levels (max. 70 ppm) in the weld deposits, uniform mechanical properties with low temperature toughness are obtained. Due to achievable low hardness levels (max. 240 HV) the weld deposits made with the flux BF 6.4 are also resistant to sour gas environment.
Classification
| EN 760 |
|---|
| SA AB 1 66 AC H5 |
Typical weld metal composition (%)
| SiO2 + TiO2 | Al2O3 + MnO | CaO + MgO | CaF2 |
|---|---|---|---|
| 25 | 35 | 20 | 17 |
Packaging
25 kg PE-bags or 500-1250 kg Big-Bags
Application Instructions
Low-alloy structural steels up to 500 N/mm², boiler steels and especially pipe steel qualities acc. to EN 10208-2 / API-5L/5LX/5LS up to X 80 with special low-alloy filler materials such as S1Mo1.2 or TiB-grades.
Flux Type
Aluminate-Basic
Flux Density
0.95 kg / dm³
Grain Size
2-16; Tyler 10 x 65
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.