低圧 TIG アークの特性と母板の基本的溶融現象

概要

論文の詳細を見る
Characteristics of TIG arc and the fundamental melting behavior of base metal at low pressure atmosphere are studied in order to get a TIG arc of low arc pressure which is suitable for high speed welding. The results obtained are as follows; (1) Maximum arc pressure at the arc center is very small under low gas pressure condition. At the pressure of 32mmHg, it reaches less than one tenth of that in atmospheric pressure. (2) A bright spherical zone, so called "Cathode Zone, " is clearly observed in low pressure arc just below the cathode electrode. It is highly ionized and acts as a distributed disk heat source for the melting of base metal. (3) The shape of cathode zone can be controlled arbitrarily by a water cooled nozzle. Also, current density and energy density of low pressure arc can be increased by the nozzle constriction without increasing of arc pressure. (4) Under low pressure condition, melting process is not influenced much by the arc pressure even at higher arc current. Metal flow in the molten pool gives much influences to the penetration shape, and is easily changed by the degree of concentration of arc heat source.
社団法人溶接学会の論文
1979-10-05