Flux cored wire originated in the 1950s, was developed in the 1960s and 1970s, Welding Wires mainly mainly to large diameter (Hou 3.2mm, Hou 2.4mm) using AC power, gas shielded flux cored wire for welding of steel pipe, self-protection flux cored wire used for the building structure. 1980s, the development of fine diameter flux cored wire (Hou 1.2 to 1.6mm) and all-position Flux Cored Welding Wires using DC power, which for the Hou 1.2 ~~ 1.6mm diameter is used extensively for the manufacture of the ship have developed rapidly, greatly improving the shipbuilding welding degree of automation. During this period, developed a stainless steel, low temperature steel, the 590N/mm2 strength level of steel use a variety of flux cored wire, Hou 1.2 ~ 1.6mm thin diameter self-shielded flux cored wire can be used in the welding of steel pipe pile. Since the late 1980s, Hou 1.2 to 1.6mm gas to protect the manufacture and use of flux cored wire multi-species to rapidly promote the use and expansion of non-shipbuilding industry. Subsequent development of the metal cored flux cored wire and seamless flux cored wire. Flux cored wire has been widely used in the manufacture and repair of buildings, bridges, chemical industry, metallurgy, electric power industry. Total output of the proportion of total output and account for flux cored wire welding material point of view, the 1983 U.S. flux cored wire production accounts for 15% of the total production of welding materials, flux cored wire production was about 42,000 tons, in 1979, drug cored wire for the annual production reached 76,000 tons. U.S. flux cored wire accounted for welding materials of total output ratio of about 40%. U.S. production of crude diameter flux cored wire (2.0mm) larger proportion, mainly for flat welding peace fillet welds, used welding construction machinery, heavy machinery, steel frame, such as bridges. British Flux Cored annual production of welding electrodes for the first time in 1995. Japan's major production of fine diameter flux cored wire, flux-cored wire in 1983 accounted for 3.8% of the total production of welding materials, 13% of the total production of welding materials in 1988, 20 percent of the total production of welding materials in 1992, 1994 for welding materials 23% of the total production. Has gradually increased the proportion of production in Japan flux cored wire, solid wire production in 1984 accounted for 32% of the welding material production gradually increased to 50% in 1991. Solid wire declining since 1992, 1994, the proportion of the solid wire for 42%. According to the latest data reported flux cored wire the total production of 100,000 tons in 1997 about 27% of the total production of welding materials. In view of this, Japan is the fastest growing in flux cored wire. Flux cored wire is in a primitive stage of development: the introduction of a large number of foreign production lines are not fully applied, hoping to increase production capacity and skill levels can not exchange, the emphasis on investment in hardware ignore the software development, and by lack of funds restrictions. Of flux cored wire, flux cored wire with foreign compared to far cry. We unwittingly into the flux-cored wire era, coupled with technical and economic backwardness, the development of flux-cored wire will pay a heavy price.
Li Zhenhua, China Wire Co., Ltd., engaged in the management of the production line. As the technical backbone, he led the technical staff continue to develop new products, so that the the Huatong product development from the Stainless Steel Welding Wires ten series of more than 160 kinds of welding material, in order to meet all kinds of different needs of users.
With the increase of the development needs of the domestic shipbuilding, high-rise buildings, the demand for flux cored wire, and domestic such welding consumables main source or import. Imports welding consumables ordering cycle, the price is high. To this end, the company has made a timely manner the objectives of the development of cored welding consumables, and set up a project with Li Zhenhua, head of the research team. Powder formulation experiment hundreds of times, and finally the successful development of a variety of series, multi-purpose flux cored wire, some products are also obtained a patent for invention.
Previously, the company produces wire process equipment used in hydrochloric acid pickling rust, sodium cyanide and cuprous cyanide copper process and serious environmental pollution, and employing more. Li Zhenhua, after six months of research, the use of expertise in the domestic industry take the lead in the successful development of rust technology online physical, chemical, cyanide technology, which govern the cyanide problem of environmental pollution, and increase to twice the capacity. After the production process, he made a further reform of welding consumables produced from the transformation of an annual output of 2000 tons development to 100,000 tons, the Huatong welding consumables successfully among the top three industries, the products are exported to Europe and America more than 40 countries.
National "Eleventh Five-Year Plan", will be built pipelines, 200,000 km, Welding Electrodes Manufacturers In China with the China Institute of the oil pipeline, China National Petroleum Institute established a research project - the development of welding materials. As the main person in charge of the business side, Li Zhenhua from the smelting of steel, made of wire to the site to use tracking, the final shape of the HTW-60D and HTW-70C pipeline wire. These products will be in the future pipeline construction to break the monopoly of the past, the merchants of the United States, Germany, to further bring high returns.