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美国政府科技报告
>Development of Automated Welding Processes for Field Fabrication of Thick-Walled Pressure Vessels:Electron Beam Method. Fifth Quarterly Report,October 1--December 31, 1978.
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Development of Automated Welding Processes for Field Fabrication of Thick-Walled Pressure Vessels:Electron Beam Method. Fifth Quarterly Report,October 1--December 31, 1978.
This is the fifth quarterly report of a project to develop and demonstrate an electron beam welding procedure for welding 8''thick SA 387Grade 22Class 2 (2-1/4Cr--1Mo) steel. A total of 324welds have been made to date. Much difficulty has been encountered in the past in attempts to make partial penetration welds (4-1/2''deep) which do not have a necklace defect. However, a beam oscillation pattern,the horseshoe pattern,has been successfully used to make defect-free,partial penetration welds in the horizontal position. An 8''thick,defect-free weld was made. Determination of the optimum welding procedure has not yet been made though. For welding in the vertical position, a shoe was designed and used to make void-free,partial penetration welds. A welding procedure which produces defect-free welds in the vertical position has not yet been developed. (ERA citation 04:046946)
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