The consumables deposit Cr-Ni-Mo-Cu weld metal
with a high corrosion resistance to organic acids
and hot sulphuric acid. The high nickel content
gives good resistance to stress corrosion cracking in
chloride and H2S environments.
Applications include tanks and process vessels,
pipework systems, heat exchangers, agitators and
rotors, and cast pumps and valves for use in the
chemical processing and increasingly offshore oil and
gas industries. Also suitable for corrosion resistant
overlays and for welding dissimilar materials. No preheat required, interpass should be restricted
to 150)C maximum and the heat input should
be controlled particularly with 4mm and 5mm
Cr-Ni-Mo-Cu alloy of the generic 825 type.
In the as-welded condition the weld metal
microstructure is fully austenitic.