Sandvik 22.8.3.LSi is a duplex stainless filler metal for welding of duplex stainless steels, such as Sandvik SAF 2205 and Sandvik SAF 2304.
ISO 14343: 22 9 3 N L
AWS A5.9/ASME SFA-5.9: ER2209
Chemical composition (nominal)
Sandvik 22.8.3.LSi is designed for gas shielded arc welding and particularly MIG welding of duplex stainless steels, such as Sandvik SAF 2205 and Sandvik SAF 2304. Its corrosion resistance is equal to ASTM 904L in most applications. It combines high strength with excellent ductility. Sandvik 22.8.3.LSi can also be used for joining Sandvik SAF 2205 or Sandvik SAF 2304 to carbon steel or low-alloy steels.
Forms of supply
Sandvik 22.8.3.LSi is supplied as wire and straight rods.
Weld metal characteristics
Sandvik 22.8.3.LSi gives an austenitic-ferritic (duplex) microstructure with approximately 50FN according to the WRC-92 diagram.
MIG TIG – typical for non-heat treated weld metal
|Temperature||°C (°F)||20 (68)||-40 (-40)|
|Yield strength, RP0.2||MPa (ksi)||600 (87)||-|
|Tensile strength, Rm||MPa (ksi)||750 (109)||-|
|Impact strength, Charpy V||J (ft lbs)||130 (96)||110 (81)|
Sandvik 22.8.3.LSi is resistant to intergranular and pitting corrosion. It also has good resistance to stress corrosion cracking, especially in environments containing H2S.
Electrode positive is used to give good penetration in all types of welded joint. The following table shows common conditions for MIG welding.
|Wire diameter||Wire feed||Current||Voltage||Gas|
1)Pulse parameters: Peak current 300 - 400 A
Background current 50 - 150 A
Frequency 80 - 120 Hz
Sandvik can provide recommendations for shielding gases.
Short-arc welding is used with light gauge material of less than about 3 mm, in depositing root runs, and in welding out-of-flat positions.
The higher the inductance in short-arc welding, the higher the fluidity of the molten pool.
Spray-arc welding is normally used for heavier gauge material.
The parameters for TIG welding depend largely upon the base metal thickness and the welding application.
Electrode negative and a shielding gas of argon or helium should be used to prevent oxidation of the weld metal.
Recommended thermal data
The interpass temperature should be kept below 250°C (482°F) and the heat input between 0.5 and 2.5kJ/mm for joint welding. Preheating is normally not recommended. In case post weld heat treatment is needed from a construction point of view, contact Sandvik for support