At present, fine tungsten wire has become a high-quality alternative material for cutting high carbon steel wire busbars, and is considered by the industry as a new technology iteration and upgrading direction for photovoltaic silicon wafer cutting. Thin tungsten wires for photovoltaic applications have continued to catch fire after market trials, becoming a hot commodity. Industry insiders are generally optimistic about the future application prospects of tungsten wire in the photovoltaic field. Under what circumstances were fine tungsten wires for photovoltaic research and production developed? Why is sales so hot? A reporter from Securities Daily visited Xiamen Tungsten Industry, a "giant" enterprise in the metal tungsten industry, for an on-site visit. From a small light bulb to a cross-border photovoltaic system, the development of Xiamen's tungsten industry is slowly unfolding as the tungsten filament is exposed to "light" and ignites. When tungsten wire dipped in "light" and entered the office of Huang Changgeng, Chairman of Xiamen Tungsten Industry, the first thing that caught the reporter's eye was a piece of tungsten ore. This is the cornerstone of Xiamen Tungsten Industry. The company has the world's most complete tungsten industry chain, starting from midstream smelting and now developing leading photovoltaic fine tungsten wire products. Xiamen Tungsten Industry has always been at the forefront of the industry. Xiamen Tungsten Industry has been committed to the research and application of tungsten products since its establishment. The traditional tungsten wire is mainly used in the lighting field, and the lighting tungsten wire has gradually been replaced by LED. The company has been exploring new application directions and ways out. Since LED replaced tungsten wire in the lighting field, Xiamen Tungsten Industry has continuously transformed and upgraded, actively exploring new application fields. High strength fine tungsten wire for photovoltaic is only one of the new application fields explored in recent years, "Huang Changgeng told Securities Daily. Data shows that from January to April 2023, Xiamen Tungsten's sales of fine tungsten wire products reached 19.783 billion meters, a year-on-year increase of 301.7%; The total profit increased by 589.6% year-on-year. Among them, the sales of photovoltaic fine tungsten wire products reached 15.778 billion meters, a year-on-year increase of 694.8%. The tungsten wire stained with "light" is like fire, with its underlying logic. The trend of "large-size+thinning" for photovoltaic silicon wafers is that carbon steel busbars are mainly used for cutting. With the further development of the industry, the demand for upgrading and iteration of cutting technology is further stimulated. The industry generally believes that tungsten wire busbars are the upper replacement of carbon steel busbars (diamond wires). For silicon wafer companies, the finer the diamond wire, the less polycrystalline silicon loss occurs when cutting silicon rods, which is more conducive to cost savings. If special tungsten wire is used to cut silicon rods, the line loss will be reduced, and the yield of silicon wafer cutting can be increased by about 5%. In 2021, Xiamen Tungsten Industry took the lead in developing special tungsten wires for use in photovoltaic industry scenarios. According to the person in charge of Xiamen Tungsten Industry, "Currently, the diameter of the tungsten wire busbar produced by the company is mainly between 33 microns and 37 microns (corresponding to diamond wire models between 28 microns and 32 microns). In the future, the company will continue to develop tungsten wire busbar products with finer wire diameters." From an industry perspective, several leading tungsten companies have continued to increase their layout of fine tungsten wires for photovoltaic purposes, including leading companies such as China Tungsten High tech and Xianglu Tungsten Industry. And Xiamen Tungsten, which was the first to launch this application scenario, continues to increase its investment in related fields. On May 19th, the company released its third financing plan since going public, proposing to raise 4 billion yuan for multiple projects such as the construction of a 100 billion meter photovoltaic tungsten wire production line