With the continuous development and improvement of TIG welding (Tungsten Inert Gas), plasma welding, spraying, cutting and other technologies, people have put forward higher requirements to electrode material performance; certainly, including cerium tungsten electrode, there are several requirements of cerium tungsten electrode welding performance showing in the following:
(1) Increasing the arc performance - lower work function (that is, the need for better active substance and content);
(2) Applies to more welding atmosphere - the need for greater chemical stability;
(3) Also requires that they have a better material structure;
(4) Under high temperature conditions, it is able to put up with stream erosion;
(5) What is more, the mort important point is the one that, requiring it without radioactivity, to eliminate the radioactivity that to harm the environment and human health. The following is a comparative on cerium tungsten electrode and thorium tungsten electrode performance:
(1) Compared to the thorium tungsten electrode, cerium tungsten electrode work function material, oxidation resistance and X-ray dose and other properties are significantly improved.
(2) Cerium tungsten electrode influenced by the decrease of cathode spot reduce and the lower of cathode voltage drop, so that the arc emission current density increases, which raising the minimum arc current, the allowable current and breaking arc spacing and other properties. These parameters will increase as the increase of the content of cerium oxide stainless steel inserts in the experimental range, and during plasma cutting, its ends will be rendered 'natural sharpened' characteristics.
(3) Cerium tungsten electrode melting deep, weld width, burning rate and the reliability of repeated arc is superior to thorium tungsten electrode. During welding the ultra-thin foil devices and precious metals, the performance of 4% cerium tungsten electrode is better.
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