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  • COPPER ALLOYS
CuMnAl

Description

Basic coated manganese bronze electrode
Basic coated manganese bronze electrode (Cu Mn Al Ni Fe) for welding and surfacing on aluminum bronzes and for dissimilar joints between steels and copper alloys. Excellent welding characteristics, stable arc, low spatters, very easy slag removal. Its favourable coefficient of friction makes this electrode ideal to overlay sliding guides. Wear-resistant electrode for hardfacing on any steel, resistant to corrosion and cavitation. Specific for turbines, naval hinges, etc ...
Specifications
AWS A5.6
ECuMnNiAl
DIN 1733
EL-CuMn14Al
Shielding
-
Positions
PA, PB, PC, PD, PF
Current
DC+
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
37
A-No (QW442)
-

Hardness

210HB - 250HB
Chem. Comp. %
DEFAULT
Mn
13.5
Ni
2.2
Al
7.1
Fe
2.5
Mechanical Properties
min
variant
Tensile strength Rm MPa
520
660
Yield strength Rp0.2 MPa
-
400
Elongation A (L0=5d0) %
15
25
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4.0 mm
Ampere
55A - 60A
80A - 90A
100A - 120A
Voltage
-
-
-
Packaging
pcs/kg
pcs/kg
pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Description

Application

The CuMnAl alloy is mainly used for joining and surfacing on complex aluminum bronzes, particularly on materials with a high manganese content, as well as on steel and cast steel. Thanks to its excellent resistance to seawater and corrosion, it is particularly suitable for the shipbuilding industry, finding applications in objects such as propellers, pumps, and fittings. In industrial chemistry, it is ideal for components such as valves, guides, and pumps, especially when exposed to chemical attacks combined with erosion. Its good friction coefficient makes it perfect for overlays on wavy surfaces, sliding surfaces, bearings, and matrices of all kinds. The weld deposit offers excellent mechanical properties, being robust and crack-resistant. It is characterized by excellent workability in chip removal, corrosion resistance, and non-magnetic properties. Before welding, it is essential to clean the area to achieve a bright metallic finish. For large welds, preheating to about 150°C is recommended, keeping the absorbed heat to a minimum and ensuring that the interpass temperature does not exceed 150°C.

Alloy Type

Highest grade of the Al-Bronze-types.

Microstructure

Consists of primary α-phase grains in a matrix composed mainly of γ-phase grains and an intergranular phase layer containing both α and γ-phase particles.

Materials

This alloy is also used to join or repair high-strength bronzes of similar chemical composition and for high-strength repairs of cast iron.

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