Agglomerated Welding Flux BF 6.9 HELIX

Flux type: Aluminate-Basic

ISO 14174: S A AB 1 67 AC H5 *)
(EN 760: SA AB 1 67 AC H5)


A semi-basic flux suitable for high speed welding with single and multi-wire submerged-arc processes.
BF 6.9 HELIX is designed 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 pock-marks, flux-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), oxygen levels of about 350 ppm and low nitrogen levels in the weld deposits, uniform mechanical properties with low temperature toughness are obtained. Due to achievable low hardness levels the weld deposits made with the flux BF 6.9 HELIX are also resistant to sour gas environment.


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.

Characteristic chemical constituents

SiO2 + TiO2Al2O3 + MnOCaO + MgOCaF2
25 % 35 % 25 % 10 %
Basicity according to Boniszewski: ~1.2

Flux density: 0.95 kg / dm3 (l)
Grain size acc. to ISO: 2 – 16 (Tyler 10 x 65)
Current-carrying capacity: up to 1.500 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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