BF 8.1
Agglomerated Welding Flux
Description & applications
Agglomerated, semi-basic, Calcium-Silicate flux with Manganese support for SA-overlay welding and shape-forming using single or multiwire (TWIN-ARC) processes. BF 8.1 is particularly designed for the repair of worn pistons for lage ship diesel engines.
The weld bead exhibits a flat smooth surface with good wetting and self-lifting slag detachability without residuals even at high intermediate welding temperatures above 300°C. Stable chemical flux reactions and constant operating characteristics over a wide current range, also when welding AC, are advantages of this flux. Low consumption as well as low humidity are additional features of BF 8.1 together with low sensitivity to arc-blow and high resistance to porosity.
Classification
| EN 760 |
|---|
| SA CS 1 75 AC |
Typical weld metal composition (%)
| SiO2 + TiO2 | Al2O3 + MnO | CaO + MgO | CaF2 |
|---|---|---|---|
| 25 | 15 | 35 | 20 |
Packaging
25 kg PE-bags or 500-1250 kg Big-Bags
Application Instructions
BF 8.1 is to be welded DC (+ or -) or AC in combination with non-alloyed and low-alloyed wires for overlay and build-up welding of heat-treatable, low-alloy steels which require preheat and interpass temperatures above 300°C up to 500°C. Especially applied for repair-welding / form-welding of worn piston ring grooves and the surface of piston heads.
Flux Type
Calcium-Silicate
Flux Density
0.95 kg/l
Grain Size
3-25; Tyler 8 x 48
Current-Carrying Capacity
1200 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.