ULTIMET alloy is an ideal weld overlay material. Not only does it provide corrosion and wear protection to critical surfaces, it is very easy to apply compared with the traditional cobalt-base hardfacing alloys. This ease of application stems from its relatively high ductility. ULTIMET alloy may be applied in multiple layers with little or no preheat. Deposit cracking does not occur under most circumstances.
Weld overlays of ULTIMET alloy have been applied by gas tungsten arc, gas metal arc, shielded metal arc, submerged arc and plasma transferred arc welding techniques.
Oxyacetylene process is not recommended. For submerged arc welding, Lincoln Blue-Max 2000 flux is recommended.
Postweld Heat Treatment
Under most conditions, the postweld heat treatment of ULTIMET weld deposits is not required. If bending or cold-forming of the deposits is necessary, an annealing treatment at 2050°F (1121°C), followed by water quenching, may be required depending on the bend radius. The effects of annealing on the substrate material should be considered.
Stress-relief heat treatments in the temperature range of 1100 to 1200°F (593 to 649°C) do not markedly affect the properties of ULTIMET weld overlays. For further information, please consult Haynes publication H-2089 and H-2099. |
