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Cored Wire

Description and Application

AMPCO-CORE® 250S is a nickel aluminum bronze metal core wire for use with the Gas Metal Arc Welding process producing sound, pore-free deposits.

AMPCO-CORE® 250S is primarily an overlay filler metal for aluminum bronzes and ferrous materials. The characteristics of this filler metal make a good choice for overlaying components used in bearing applications where very high pressures are encountered operating against hardened steel surfaces.

AMPCO-CORE® 250S is especially suited for marine environments due to its Ni content which increases corrosion resistance in brackish seawater. It also exhibits resistance to cavitation and stress corrosion.


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Typical Applications

Shafts Guide grooves Marine applications
Overlaying steel parts

Product availability and packaging

AMPCO-CORE® 250S is available in two diameters: 0.045” (1.2mm) and 0,062” (1.6mm). Both sizes are available in 12″ (300mm) spools weighing 33lb (15 kg) each. Other diameters are available upon request.

Welding position and deposits

Flat position welding is recommended. Backhand (trailing) welding is preferred rather than forehand (pushing) to make either stringer or weaved beads.

Shielding gas

100% Argon

Operating conditions

Current type Gas flow rate Intensity [A] Voltage [V] Stick-out [inch (mm)]
continuous or pulsed
25 – 42 cfh (12-20 L/min) 0.045″ (1.2 mm) 150-320
0.062″ (1.6 mm) 200-350
Continuous 27-31
Pulsed 22-25
All diameters
5/8″- 3/4″ (10-20)

NB. Higher intensities and voltages can be used but will result in increased element burn-off (particularly Al) and dilution, leading to lower hardness levels. Preheating and working temperatures of up to 300°C are recommended to avoid cracking.


Limiting Chemical Composition
% (filler metal)
Copper* Balance
Aluminum 11.5
Nickel 4.8
Iron 2.0
Manganese 1.0
Mechanical Properties
(Nominal all-weld metal values)
Hardness (HBW 10/3000)
Three layer deposit on mild steel
*Hardness will vary depending on quality of the weld and experience and knowhow of the welder.

Document Download

AMPCO-CORE® 250S Technical Data Sheet