Selected mechanical properties of Inconel 718 and 706 weldments

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · Weld. J. (Miami); (United States)

OSTI ID:7332899

Mayor, R A

A preliminary study has confirmed the weldability of Inconel 718 and 706 and indicates that joint tensile strengths at room and elevated temperatures closely approach base metal values. Welding parameters were established for manual gas tungsten-arc welding (GTAW) of these alloys for butt, fillet, and plug welds. Weld quality and soundness were established through dye penetrant, radiographic, and metallographic inspections of material samples at various stages of the process. Relative ductility was shown through guided bend tests. Other mechanical properties of the weldments were determined as a function of temperature and heat treatment using transverse weld and T-joint tensile specimens. Ultimate strength and 0.2 percent offset yield strength of Inconel 718 weldments at room temperature, 1200, and 1400/sup 0/F was above 90 percent that of base metal and in most cases exceeded the minimum level specified by AMS 5596 and MIL-Hdbk-5B for base metal. Similar relative results were obtained with Inconel 706, although this alloy showed strength values 15 to 20 percent lower than Inconel 718. Both alloys were found to be fully weldable to each other. The strength of fillet welds was similar to base metal. Plug welds exhibited an average 30 percent reduction in strength (in the aged condition) compared to base metal. Age hardening following welding was found to be acceptable without a need for a re-solution treatment.

• Research Organization: Martin Marietta Aerospace, Orlando, FL
• OSTI ID: 7332899
• Journal Information: Weld. J. (Miami); (United States), Journal Name: Weld. J. (Miami); (United States) Vol. 55:9; ISSN WEJUA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ARC WELDING
CHROMIUM ALLOYS
FABRICATION
FRACTURE PROPERTIES
GAS TUNGSTEN-ARC WELDING
INCONEL 706
INCONEL 718
INCONEL ALLOYS
JOINING
JOINTS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
VERY HIGH TEMPERATURE
WELDABILITY
WELDED JOINTS
WELDING
YIELD STRENGTH