BF 6.5
Agglomerated Welding Flux
Description & applications
A semi-basic multi-purpose flux suitable for single and multi-wire (up to 5 wires) SAW-processes. The flux exhibits good weldability characteristics over a wide range of welding parameters and is characterized by a low consumption rate.
BF 6.5 is especially recommended for longitudinal pipe fabrication (two-run or multi-layer technique) due to its high welding speed characteristic. Weld bead performance and slag release, even in narrow gaps, 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. 5ml/100g), oxygen 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 6.5 are also resistant to sour gas environment.
Classification
| EN 760 | ISO 14174 |
|---|---|
| SA FB 1 67 AC H5 | S A FB 1 67 AC H5 |
Typical weld metal composition (%)
| SiO2 + TiO2 | Al2O3 + MnO | CaO + MgO | CaF2 |
|---|---|---|---|
| 20 | 30 | 30 | 17 |
Packaging
25 kg PE-bags or 500-1250 kg Big-Bags
Application Instructions
Non-alloy and low-alloy structural steels acc. to EN 10025; boiler steels such as 16Mo3/A335 Gr. P1 and 13CrMo4-5/A387Gr. 12; fine-grain structural steels with yield strenghts up to 700 N/mm² observing the specific material requirements; pipe steels qualities acc. to EN 1208-2 / API-5L/5LX/5LS (up to X 80 grade) with appropriate filler metals such as S1Mo1.2 or TiB-grades.
Metallurgical Behaviour
Flux Type
Fluoride-Basic
Flux Density
0.95 kg / dm³
Grain Size
2-16; Tyler 10 x 65
2-20; Tyler 8 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.