Fused Welding Flux WP 380

Flux type: Calcium-Silicate

ISO 14174 (low alloy steels): S F CS 1 63 DC
ISO 14174 (stainless steels): S F CS 2 5742 DC
EN 760 (stainless steels): SF CS 2 DC


Specially designed for welding austenitic stainless steels WP 380 is also suitable for welding both low-alloy steels for use at elevated temperatures as well as the combination with austenitic stainless steels. As a result of the semi-basic flux characteristics crackfree welds are obtained for most grades of stainless steels welded with the corresponding wire electrodes. The metallurgical behaviour of the flux is neutral (C-neutral, low Si pick-up and low Mn burn-out) without Cr compensation.
It is suitable for welding DC using single or DC/AC for multi-wire processes and produces smooth weld beads free of slag residuals with flat weld interfaces even in narrow gaps and on preheated work pieces.


Joint welding and surfacing of:

  • creep-resistant CrMo-steels such as 12CrMo19-5 / A355 Gr. P22-P5 or X20CrMoWV12-1 / A351 for boiler, vessel and pipe fabrication
  • martensitic and ferritic Cr(NiMo)-steels acc. to EN 10088 with the appropriate wire electrodes in conjunction with the corresponding heat treatments
  • austenitic CrNi(Mo)-steels (including ELC-grades) acc. to EN 10088; resistant against inter granular corrosion in both the as-welded and solution-treated condition
  • high-alloy CrNi(Mo)-steels for use at low temperatures and heat-resistant steels
  • high-alloy Cr(NiMo)-steels in combination with low-alloy steels (dissimilar joints)
  • Nickel-base alloys using NiCr- and NiCrMo- wire electrodes acc. to AWS A5.14 / EN ISO 18274

Characteristic chemical constituents

SiO2Al2O3CaO + MgOCaF2
30 % 5 % 35 % 20 %
Basicity according to Boniszewski: ~1.3

Flux density: 1.5 kg / dm3 (l)
Grain size acc. to ISO 14174: 1 – 16 (Tyler 10 x 150)


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