As a result of its high resistance to strain-age cracking, HAYNES® 282® alloy is much more weldable than other alloys of similar strength. The preferred welding processes are gas tungsten arc (GTAW or TIG) and gas metal arc (GMAW or MIG), using 282 alloy bare filler wire. If shielded metal arc welding (SMAW) of HAYNES® 282® alloy is necessary, please contact the technical support group at Haynes International for information on the most appropriate coated electrode. Submerged arc welding (SAW) of HAYNES® 282® alloy is not recommended due to the high heat input and increased weld restraint associated with this process.
Filler Metal Selection
It is recommended that bare, filler metal of a matching composition be used to join HAYNES 282 alloy to itself, using either the GTAW or GMAW process. HAYNES® 282® alloy filler metal can also be used for dissimilar joining, and/or repair welding, of other age-hardenable, nickel superalloys. Please click here or see the Haynes Welding SmartGuide for more information.
Base Metal Preparation
HAYNES® 282® alloy should be welded in the solution-annealed condition, before it is subjected to the age-hardening treatment. The joint surface and adjacent areas should be thoroughly cleaned, to reveal bright, metallic surfaces, before welding. All grease, oil, crayon marks, sulfur compounds, and other foreign matter should be removed.
Preheating, Interpass Temperatures, and Postweld Heat Treatment
Preheating of HAYNES® 282® alloy is not required, as long as the base metal to be welded is above 32°F (0°C). Interpass temperatures should be less than 200°F (93°C). Auxiliary cooling methods may be used between weld passes, provided that these do not introduce contaminants.
After welding, HAYNES® 282® alloy will normally be subjected to its age-hardening treatment, which comprises 2 hours at 1850°F (1010°C), air cool + 8 hours at 1450°F (788°C), air cool. The heat up rate to 1850°F should be as fast as possible, within the capability of the furnace being used.
The use of a full solution anneal (typically at 2075°F/1135°C) after welding and prior to the two step age-hardening treatment is neither required nor prohibited. For heavy section weldments, or complex weldments with high residual stress, a full solution anneal prior to the age-hardening treatment may be advisable.
NOTE: For information regarding ASME Advanced – Ultra Super Critical (A-USC) applications, please contact Vinay Deodeshmukh (765-456-6212; VDeodeshmukh@haynesintl.com).