Flux

Agglomerated Welding Flux BF 38

Flux type: Aluminate-Fluoride-Basic

Classification:
ISO 14174: S A AF 2 5644 DC H5 *)
(EN 760: SA AF 2 DC)

Characteristics

Specially designed for welding austenitic and austenitic-ferritic stainless steels (Duplex/Superduplex). This basic, but neutral flux will produce outstanding results in the welding of the standard austenitic and heat-resisting stainless steels, when using the corresponding wire electrodes according to EN ISO 14343 or ASME II C: SFA 5.9. Due to the basic flux characteristics of BF 38 most grades of the 300-stainless steel can be welded using single or multiple wire submerged-arc processes. It is also suited for joint-and overlay welding of nickel alloys, together with adequate Ni-base wire electrodes.
BF 38 produces smooth flat weld beads when fillet welding. If appropriate welding parameters are applied a finely ripped surface along with self-releasing slag is yielded as well as weld beads that are free of slag inclusions.
The metallurgical behaviour of the flux is neutral (C-neutral, low Si pick-up and low Mn burn-out) without Cr- or other alloy compensation.

Application

Joint welding and surfacing of:

  • Austenitic-ferritic stainless steels (DSS) such as grade 2205 (Duplex S31805/S32205 = 1.4462) or grade 2507 (Superduplex S32750 = 1.4410)
  • Austenitic CrNi(Mo)-steels (including Nb/Ti and ELC-grades); resistant against intergranular corrosion in both the as-welded and solution-treated condition
  • High-alloy CrNi(Mo)-steels for use at low temperatures and heat resisting steels
  • Nickel-base alloys using NiCr- and NiCrMo- wire electrodes acc. to AWS A5.14 / EN ISO 18274
  • Welding of dissimilar metals such as low alloy steel with stainless steel or special cryogenic steel (e.g.9%Nisteel) in flat or 2G-position

Characteristic chemical constituents

SiO2 + TiO2Al2O3 + MnOCaO + MgOCaF2
10 % 35 % 5 % 50 %
Basicity according to Boniszewski: ~1,9

Flux density: 1.0 kg / dm³ (l)
Grain size acc. to ISO 14174: 2 – 16 ( Tyler 10 x 65)
Current-carrying capacity: up to 900 A DC using one wire

 

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