As resistance welding, the electrode is a very critical material, which must withstand ablation during the welding process and avoid welding with the welding material. Therefore, the requirements for the electrode material are also very high. To withstand high temperature ablation, a high melting point is first required. In the metal material, the melting point of tungsten is the highest (up to 3400 °C), and its electrical properties are also very good. Therefore, tungsten is often chosen as the electrode material.

With the declining oil resources, the production of crude oil has become heavy and inferior. Refining and chemical enterprises are faced with the problem of light weight of domestically produced inferior heavy oil and imported inferior heavy oil. At the same time, along with increasingly stringent environmental requirements, it is important to control the quality of steam and diesel to meet the production of clean fuels.

There are a large number of processes in industrial production that require water to cool. With the continuous development of social urbanization and industrial production, water resources are becoming more and more tense. In order to save water, the concentration of the industrial circulating water cooling system is continuously increased, reaching more than 4 times.

At present, with the rapid development of industrial technology, the water resources on which humans depend for survival are polluted to varying degrees. Water pollution has become an urgent problem for all countries in the world. The presence of pollutants in water, especially toxic organic pollutants, not only causes environmental pollution, ecological damage, but also seriously endangers human health. These organic pollutants include polycyclic aromatic hydrocarbons, polychlorinated biphenyls, pesticides, environmental interferons, dyes, and the like.