Fracture toughness of austenitic stainless steel weld metal at 4 K

Technical Report · Wed Aug 01 04:00:00 EDT 1984

DOI:https://doi.org/10.2172/6569271· OSTI ID:6569271

Goodwin, G. M.

Selection of the welding processess and weld filler metals for fabrication of a large toroidal superconducting magnet is described. Data available in the literature are collected and compared with data generated in this study for three welding processes, shielded metal arc (SMA), gas tungsten arc (GTA), and flux cored arc (FCA) welds had the highest fracture toughness as measured by K/sub Ic/ estimated from J/sub Ic/. The SMA and FCA welds had about the same toughness, below the GTA values but above the average from the literature. The fracture mode for all three processes was typified by ductile dimples. The fracture morphology of the FCA weld specimens was influenced by the solidification substructure, and small particles were found to be nucleation sites for void formation, especially for the GTA welds. All three welding processes were deemed adequate for the intended service and were used to fabricate the large magnet. A trunnion-type turning fixture eliminated the need for welding in the vertical and overhead positions. The GTA process was used for all root passes, and the horizontal welds were filled by the SMA process. Over 80% of the welds were done in the flat position with the FCA process, and its high deposition rate and ease of operation are credited with contributing greatly to the success of the effort.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6569271
• Report Number(s): ORNL/TM-9172; ON: DE84016638
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700202 -- Fusion Power Plant Technology-- Magnet Coils & Fields
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DATA
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
EXPERIMENTAL DATA
FAILURES
FRACTURE PROPERTIES
FRACTURES
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MAGNET COILS
MAGNETS
MECHANICAL PROPERTIES
NUMERICAL DATA
STAINLESS STEELS
STEELS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
ULTRALOW TEMPERATURE
WELDED JOINTS