Development of automated welding processes for field fabrication of thick-walled pressure vessels: electron beam method. Fourth quarterly report, July 1--September 30, 1978
This report is the fourth quarterly report of a project to develop and demonstrate an electron beam welding procedure for welding 8'' thick SA 387 Grade 22 Class 2 (2-1/4 Cr--1 Mo) steel. Due to the late arrival of the steel to be used in this project, a six month extension in the completion date has been made. Work is in progress for developing 4-1/2'' deep partial penetration electron beam welding procedures. A total of 257 welds have been made to date. Several defects have been encountered and successfully eliminated. The occurrence of a necklace defect, which has been shown to be a cold shut resulting from improper solidification, has not yet been eliminated. It has been observed that the beam oscillation pattern is influential on the behavior of the weld cavity during welding. In the vertical welding position, it has been determined that the use of a welding shoe is required.
- Research Organization:
- Babcock and Wilcox Co., Alliance, OH (USA). Research and Development Div.
- DOE Contract Number:
- EF-77-C-01-2606
- OSTI ID:
- 6261903
- Report Number(s):
- DOE/ET/2606-4
- Country of Publication:
- United States
- Language:
- English
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