BÖHLER FOX DMO Kb is a covered electrode with a basic coating for manual arc welding. The deposit with 0.5 percent molybdenum has an acicular ferrite and bainite structure, with good mechanical properties in the as welded condition and after heat treatment. The manufacturer directs it to creep resistant steels and cast steels, and also to higher strength structural, fine grained and pipeline steels.
The range of base material is S235JR to S355JR, S235JO to S355JO, S235J2 to S355J2, S275N to S460N, S275M to S460M and P235GH to P355GH. The manufacturer permits service under creep conditions at design temperatures up to 550 degrees C, and the impact energy holds below -50 degrees C. The coating hardly picks up moisture, so the diffusible hydrogen is low and the metal recovery is 115 percent.
- Classification EN ISO 3580-A: E Mo B 4 2 H5
- Classification EN ISO 3580-B: E4918-1M3 H5
- Classification EN ISO 2560-A: E 46 5 Mo B 4 2 H5
- AWS classification A5.5 / SFA-5.5: E7018-A1 H4 R
- Coating: basic
- Current: DC+
- Diameters: 2.5 / 3.2 / 4.0 / 5.0 mm
- Lengths: 250, 350 and 450 mm
- Approvals: TÜV (00019), KTA 1408.1 (8053), DB (10.014.82), ABS, DNV, CE
Molybdenum raises the hot strength, but it does not release you from preheating on heavier boiler walls. Check in the documentation whether the joint enters service as welded or after annealing, because the choice of parameters depends on it. Bake the electrodes to the instructions and take them from the quiver as you go. On pipeline joints keep a short arc and narrow beads, and chip the slag clean between passes.
