Tungsten, the metal with the highest melting point, has high density, hardness, wear resistance, corrosion resistance, ultra-high temperature resistance and other high performance, tungsten products are widely used in electronics, new energy, ships, vehicles, engineering machinery, nuclear power, aerospace, aviation, military and other fields.
China is a large tungsten resource country, with tungsten production accounting for 80% of the world, and the research, development and application of tungsten in various fields have received wide attention.
At present, the domestic tungsten industry is in a major transition period of accelerating the development towards deep processing and increasing the proportion of deep-processed products, with higher and higher technical content of products, wider and wider application fields and growing market demand.
The tungsten and molybdenum high-tech materials processing and manufacturing industry is a key industry supported by the state. The overall average annual growth rate of about 30% has been maintained, and the industry still has greater development potential and space.
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In addition, the future of high-tech weapons and equipment manufacturing, the progress of cutting-edge science and technology and the rapid development of nuclear energy, such as the urgent need for high-performance tungsten-based alloy materials, which are used in inert gas shielded welding, cutting, thermal spraying electrodes to maintain rapid growth in demand.
The properties of tungsten make it well suited for TIG welding and other electrode materials for such work. The addition of rare earth oxides to tungsten metal to stimulate its electron escape work results in improved welding performance of tungsten electrodes: better arc starting performance of the electrode, higher stability of the arc column, and less electrode burnout. The usual rare earth additives are cerium oxide, lanthanum oxide, zirconium oxide, yttrium oxide and thorium oxide, etc.
1、The brighter and more even the surface, the less the abrasion marks and black spots, the better the tungsten electrode.
2、The less internal scars, the smaller the scars, the better the tungsten electrode.
3、The less negative difference in diameter, the more durable the tungsten electrode is.
4、The more stable the internal molecular structure of annealed tungsten electrode, but because the requirement of grinding tip is high and easy to fracture, it is not respected in the country instead, mainly used for export requirements, so it is a technical difficulty to do molecular stability without annealing.
The welding of tungsten electrode is the current through the whole tungsten electrode to the end, thus the more stable the tungsten molecular structure, the less current value used, the lower the power, thus the more durable, the more surface and internal defects, the greater the current output in use, the more heat generated, the faster the burnout, the internal if more defects, cracks, welding current will be large and unstable, easy to appear partial arc, bifurcation and other problems, so the flaw detection standard will later be used as one of the most important indicators of good or bad quality.
