PRELIMINARY STUDY ON ARC WELDING IN VACUUM

概要

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A preliminary study on arc welding in vacuum was performed. For weld test, two kinds of work pieces to be welded (welding piece) were prepared, one of which is a pair of pipes and another one is a set of screw/nut. A rod that has round tip was used for the arcing electrode. All welding pieces and arcing electrode ware made of stainless steel. Approx. 3 kA pulsed-arc current with duration of about 10 ms is fed from a power supply of a LC circuit (135μH/0.04F/550V) with a crowbar diode. Arcs is ignited by separating the arcing electrode (cathode) from the welding pieces (anode) in the weld test. The set of screw/nut seemed to be welded satisfactorily while the pair of pipes failed. Arc appearance and trace of erosion on two welding pieces are investigated to compare the test result between them. The arc current should be lower than the threshold value for the anode-spot formation leading to severe erosion on the anode. A preferable arc discharge mode would be foot point mode.
津山工業高等専門学校の論文
2004-02-27