HAYNES® 263 alloy has excellent forming and welding characteristics. It may be hot-worked at temperatures in the range of about 1750-2100°F (955-1150°C) provided the entire piece is soaked for a time sufficient to bring it uniformly to temperature. Initial breakdown is normally performed at the higher end of the range, while finishing is usually done at the lower temperatures to afford grain refinement.
As a consequence of its good ductility, alloy 263 is also readily formed by cold-working. All hot- or cold-worked parts should normally be annealed at 2100 °F (1150°C) and cooled by air cool or faster rate before aging at 1470°F (800°C) in order to develop the best balance of properties.
The alloy can be welded by a variety of processes, including gas tungsten arc, gas metal arc, electron beam and resistance welding. High heat input processes such as submerged arc and oxyacetylene welding are not recommended.
Welding procedures common to most high-temperature, nickel-base alloys are recommended. These include use of stringer beads and an interpass temperature less than 200°F (95°C). Preheat is not required. Cleanliness is critical, and careful attention should be given to the removal of grease, oil, crayon marks, shop dirt, etc. prior to welding. Because of the alloy's high nickel content, the weld puddle will be somewhat" sluggish" relative to steels. To avoid lack of fusion and incomplete penetration defects, the root opening and bevel should be sufficiently open.
HAYNES 263 alloy should be joined using matching filler metal. For welding alloy 263 to other alloys, HASTELLQY® S or W filler wires are suggested. Please click here or see the Haynes Welding SmartGuide for more information.
Postweld Heat Treatment
HAYNES 263 alloy is normally used in the fully-aged condition. Following forming and welding, a full solution anneal prior to aging is often employed in order to develop the best joint and overall fabrication properties. The best practice is dependent upon the specific condition of the fabrication prior to aging. Contact Haynes International, Inc. for further information.