Description & applications

Glassy fused flux with acid characteristics of the MS-type with pick-up of both Silicon and Manganese. WP 250 is designed for joint welding on AC or DC of ordinary carbon-manganese steels using SAW single- or multi-wire processes, in combination with the appropriate wire grades such as S1, S2 and S2Mo according to EN 756. Due to the flux characteristics WP 250 produces welds with good weld bead appearance, good slag detachability and resistance to porosity. Mechanical properties with moderate impact toughness as required for ordinary structural steels are achievable. The flux is also especially suitable for many hardfacing jobs in combination with the appropriate solid or cored wires.


EN 760
SF MS 1 88 AC

Typical weld metal composition (%)

SiO2+TiO2 Al2O3+MnO CaO+MgO CaF2
45 40 10 5


25 kg PE-bags

Application Instructions

Commonly used for single- and multi-run SA-welding of thin-walled ordinary, structural steels up to 510 N/mm² U.T.S. with moderate impact strength requirements. Main application of WP 250 is hardfacing of low alloy steels in combination with special hardfacing solid- or cored-wire electrodes, e.g. such as Stellite grades.

Metallurgical Behaviour

Flux Type


Flux Density

1.6 kg / dm³

Grain Size

2-20; Tyler 8 x 65

Current-Carrying Capacity

800 A (DC or AC) using one wire

Storage and redrying

The flux can be stored up to 5 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.

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