Base Metal Preparation 
The joint surface and adjacent area should be thoroughly cleaned before welding.  All grease, oil, crayon marks, sulfur compounds and other foreign matter should be removed. It is preferable, but not necessary, that the alloy be in the solution-annealed condition when welded. 

Filler Metal Selection 
HAYNES 230-W™ filler wire (AWS A5.14, NiCrWMo-1) is recommended for joining 230 alloy by Gas Tungsten-Arc or Gas Metal-Arc welding.  Coated electrodes of 230-W alloy are also available for Shielded Metal Arc welding in non-ASME code construction .  For dissimilar metal joining of 230 alloy to nickel-, cobalt-, or iron-base materials, 230-W filler wire, HAYNES 556™ alloy, HASTELLOY S alloy (AMS 5838) or HASTELLOY W alloy (AMS 5786, 5787) welding products may all be considered, depending upon the particular case.  Please see publication H-3159 for more information. 

Preheating, Interpass Temperatures and Post-Weld Heat Treatment 
Preheat is not usually required so long as base metal to be welded is above 32°F (0°C).  Interpass temperatures generally should be low.  Auxiliary cooling methods may be used between weld passes, as needed, providing that such methods do not introduce contaminants.  Post-weld heat treatment is not normally  required for 230 alloy.  For further information please consult publication H-3159.