Development of Automated Welding Processes for Field Fabrication of Thick-Walled Pressure Vessels: Electron Beam Method. Sixth Quarterly Report, January 1-March 31, 1979

摘要

Research is reported 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. A total of 414 welds have been made to date. Partial penetration welding procedures capable of producing defect-free, 4'' welds have been developed in the horizontal position. Beam oscillation conditions strongly influence welding performance. Defect-free, partial penetration welds have been made at vacuum pressures of up to 30 microns. Several 8'' thick, defect-free welds have been made in the horizontal position. Attempts to produce defect-free, partial penetration welds in the vertical position have been unsuccessful. (ERA citation 05:003317)