Development of a new hot-cracking test - The sigmajig

Journal Article · Sun Feb 01 04:00:00 EST 1987 · Weld. J. (Miami); (United States)

OSTI ID:5614533

Goodwin, G M

The development of a new hot-cracking test and its application to 12 heats of austenitic stainless steel are described. The test involves application of a transverse stress, sigma (hence the name), to a 50- x 50-mm (2- x 2-in.) square sheet specimen, followed by autogenous gas tungsten arc welding. As the preapplied stress is increased specimen by specimen, cracking eventually occurs. Testing to date has concentrated on 0.25-mm (0.01-in.) thick Types 304 and 316 stainless steel. Threshold stress values at the onset of cracking were found to range from 15 to 53 ksi (103 to 365 MPa). Ranking of the heats agrees completely with prior results from both the Lambert test and the ORNL Circular patch test, and it provides quantitative indices unavailable from the other tests. Data analyses indicate a dependence of cracking sensitivity on total sulfur plus phosphorus content for the Type 316 heats.

• Research Organization: Materials Joining Group, Metals and Ceramics Div., Oak Ridge National Lab., Oak Ridge, TN
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5614533
• Journal Information: Weld. J. (Miami); (United States), Journal Name: Weld. J. (Miami); (United States) Vol. 66:2; ISSN WEJUA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ARC WELDING
AUSTENITIC STEELS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACKS
DESTRUCTIVE TESTING
ELEMENTS
FABRICATION
FRACTURE MECHANICS
GAS TUNGSTEN-ARC WELDING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEATING
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS
MATERIALS TESTING
MECHANICS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
PHOSPHORUS
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
STRESS ANALYSIS
SULFUR
TEMPERATURE EFFECTS
TESTING
WELDING