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.
|Shafts||Guide grooves||Marine applications|
|Overlaying steel parts without a buffer layer|
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.
|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
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)|
|(Nominal all-weld metal values)|
|BHN (3000 kg)
Three layer deposit on mild steel