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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.

This material data has been provided by AMPCO METAL.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts




Recycled Content

80 %

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Hardness, Brinell

23.0 °C

320 [-]

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(3000 kg), Three layer deposit on mild steel

Chemical properties



11.5 %

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Balance, including silver


2 %

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1 %

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4.8 %

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Technological properties

Application areas

Welding: Shafts, Guide grooves, Marine applications, Overlaying steel parts without a buffer layer


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.

Processing methods

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

Current typeGas flow rateIntensity [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.