Electron-Beam Fusion Welding of Beryllium.

摘要

Ingot-sheet beryllium (Be) having three different chemistries and three different thicknesses was fusion-welded by the electron-beam process. Several different preheats were used to obtain 100% penetration and crack-free welds. Cracking susceptability was found to be related to aluminum (Al) content;the higher Al-content material was most susceptable. However,adequate preheat allowed full penetration and crack-free welds to be made in all materials tested. The effect of a post-weld heat treatment on the mechanical properties of these compositions was also determined. The heat treatment produced no significant effect on the ultimate tensile strength. However,the yield strength was decreased and the ductility was increased. These changes are attributed to the formation of AlFeBe sub 4and FeBe sub 11 . (ERA citation 03:028866)