Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1Mo electroslag weldments. Final report, June 30, 1978-October 30, 1981
A functional relation between the major electroslag welding process variables of potential, current, and electrode velocity has been developed. A two-dimensional heat transport model has been developed for heat flow in the parent metal plates of electroslag welds. An energy balance has been developed for the electroslag welding process. Two-dimensional process variable plots have been developed which predict the correct operating conditions required for weld penetration in electroslag welds of 2-1/4 Cr-1 Mo steel. It was shown that oxygen pickup, tramp element pickup, and alloy element oxidation losses in electroslag welding are primarily caused by electrochemical rather than thermochemical reactions. An electrochemical cell was used to study cathode reactions and to obtain current efficiency data for oxygen pickup, alloy element oxidation losses, and Al pickup in 2-1/4 Cr-1 Mo electroslag welds. A relation has been developed for alloy and tramp element concentration changes. Welding and post-weld heat treatment procedures have been developed which provide excellent toughness in the fusion zones of 2-1/4 Cr-1 Mo steel welds without a re-austenization heat treatment. An experimental determination has been made of the microstructures which produce high toughness in 2-1/4 Cr-1 Mo steel weld fusion zones. 21 figures.
- Research Organization:
- Colorado School of Mines, Golden (USA). Dept. of Metallurgial Engineering
- DOE Contract Number:
- AS05-78ET12313
- OSTI ID:
- 7088871
- Report Number(s):
- DOE/ET/12313-4; ORNL/Sub-7219/1; ON: DE83000875
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterizing and improving the toughness of thick-sectioned 2 1/4 Cr-1 Mo electroslag weldments
Characterizing and improving the toughness of thick-sectioned 2-1/4 Cr-1 Mo electroslag weldments. Quarterly report, October-December 1980
Related Subjects
CHROMIUM-MOLYBDENUM STEELS
ELECTROSLAG WELDING
FRACTURE PROPERTIES
WELDED JOINTS
ENERGY BALANCE
HEAT TRANSFER
MICROSTRUCTURE
PLATES
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CRYSTAL STRUCTURE
ENERGY TRANSFER
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MECHANICAL PROPERTIES
STEELS
WELDING
360101* - Metals & Alloys- Preparation & Fabrication