COATING TYPE — Special
|ГОСТ 9466 — 75 МНЧ-2
||ЕN ISO 1071: E C NiCu 1
ТУ У 25.9-34142621-012:2015
Wire НМЖМц 28-2,5-1,5 (MONEL)
Welding with electrodes MNCH-2 provides weld metal with high technological effectiveness during processing and with corrosion-resistance in liquid aggressive environments and hot gases. The metal faced using electrodes due to the low hardness of the last layers (120-160 HB) is easily subject to cutting or abrasive processing. On welding with electrodes MNCH-2 a cupronickel alloy - Monel metal (Cu~30%; Ni up to 63%; other components are Mn, Si, Fe) is formed. The fusing temperature of this alloy is close to the temperature of the cast iron fusion, that's why the alloy contributes to the cast iron graphitization in the weld area, which reduce the risk of occurrence of a significant chilled area. As the alloy has good plastic properties, the joint metal is resistant to crack formation.
PURPOSE AND FIELD OF APPLICATION
Coated metal electrodes MNCH-2 are used for welding without heating, welding defective castings and surfacing parts of gray, high-strength and malleable cast iron. Electrodes MNCH-2 are most suitable for welding the first layer in compounds requiring high density, as well as welding joints, which are subject to increased requirements for surface cleanliness after machine processing.
Deposition rate factor is - 11.5 g / А.h. Electrode consumption per 1 kg of deposited metal - 1.5 kg. Welding is performed without heating or modest heating with short beads 20-30mm length. After each bead the welded area is peened with hammer. Welding is continued after the place of welding is cooled in air to 60 °С.
REDRYING BEFORE WELDING
At the normal storage conditions, the redrying is not required. In case of moisture redrying is made at 180-210°С for 60 min.
CHEMICAL COMPOSITION OF WIRE, %
Welding should be made at DC of reverse polarity, «+» on the electrode.
||Welding current, A
||Units per package, pcs
||Weight of packing, kg
ДСТУ EN ISO 6947