| 摘要 |
<PICT:0857154/III/1> Two carbon articles (the carbon being in any form except diamond) are welded together by means of an electric arc in an inert atmosphere, e.g. argon, helium, neon, or krypton, at a temperature of about 4,000-7,000 DEG Kelvin and a pressure of about 100-11,500 atmos. Additional carbon, as a rod or powder, may be supplied to the welding zone. An arc may be produced by alternating or direct current. Articles specified are electrodes, blocks, rods, tubes, and sheets. Graphite connector rods may be attached to graphite anodes for use as thyratrons and ignitrons. As shown a direct current arc is struck between two cylindrical carbon pieces A and B within a carbon crucible 22 surmounted by graphite radiation shields 24, spacers 25, and insulating plate 26, and contained within a stainless steel pressure vessel 11. When melting has been effected piece A is lowered into contact with piece B, the source of current is cut off and cooling is allowed to take place. |
