Since the beginning of the twenty-first century, the recovery of the global nuclear energy and its challenges, suggesting the world's nuclear power development is accelerated and turned to the stage of rapid development, China's nuclear power construction by the moderate stage of development. To carry out nuclear power equipment manufacturing high-end development and application of Welding Material, nuclear power high-end Welding Material domestically, has become the inevitable trend of large-scale nuclear power equipment manufacturing autonomy. Announced by the Chinese long-term nuclear power development plan, 2020, in running nuclear power capacity has reached 40 million kilowatts; September 2010, the State Council issued State Council on the decision to speed up the cultivation and development of strategic emerging industries identified nuclear power as a focus on the development of new energy projects. In the "12th Five-Year" period, the domestic nuclear power equipment manufacturing industry will usher in a huge market space of nearly 500 billion yuan, the amount of nuclear high-end welding materials will greatly increase, which is bound to drive the nuclear high-end application market of welding materials the formation and development.
Month 400 tons of the total 2010 production of welding materials, more than the sum of the United States, Japan, Germany, three welding material production, the electrode arc welding electrode production accounted for 75% of mechanization and automation welding wire accounted for 25% in the manufacturing of key products of the nuclear island, the application of high-end welding consumables is still almost blank. The next few decades, China's nuclear power equipment to produce the required high-end welding consumables will continue to increase market demand for high-end welding consumables will have broad space for development.
The main technical characteristics of nuclear power high-end welding materials is more stringent control of the harmful elements in the welding material elements are vulnerable to the impact of the equipment operating conditions, such as: the trace elements for the reactor pressure vessel welding consumables and susceptible to irradiation affect control of the elements, welding material for a loop, strict control of Cu, Co, B, and V content; strict control of the content of Sn, Sb, As and other trace elements. Starting from the point of view to control the weld crack sensitivity, strict control of the S, P content, O, N element content of the testing requirements. The same time, starting from the welding consumables own technical characteristics and the welding process, the requirements of welding consumables anti-stomata, anti-crack and process performance and slag also has a higher technical requirements, the permeability, the flux slag off a relatively high the technical requirements to ensure that the plasticity of the weld, impact toughness, crack resistance, to meet technical requirements for manufacture of nuclear power production. The technical characteristics of nuclear grade welding materials can be summed up as follows: the element of control, mechanical performance requirements; long production cycle; involved in a wide field; the high level of quality assurance; high production costs.
China R & D of high-end welding materials, and will break the monopoly of Europe and the United States and Japan on the Chinese nuclear power high-end technology and market of welding materials, and establish a national brand, get rid of the status of nuclear power high-end welding material dependence on imports, and gradually realize the localization of high-end welding consumables to promote China's nuclear power equipment manufacturing, installation, maintenance and other key technologies independently process.
Special steel in the last 10 years, is stepping up response to the internationalization of the market and environmental protection issues such as the dramatic changes. The current financial crisis has led to the world economic downturn, Japanese domestic special steel manufacturers are cutting production. In this context, the situation on the field of special steel welding has also undergone great changes, there has been a fierce cost competition and enables companies to continue to survive and the pursuit of personalized welding materials and welding technology. In this paper, specific examples of an overview of the Welding Material, welding bonding technology development trends.
Due to the slow development of construction steel, automobile, shipbuilding, construction machinery, industrial machinery and other industries in the country and the rapid development in foreign countries, so that the production and sale of Welding Material in the past 10 years has been strong growth.
Production of statistics in Japan under the Japan electrode Industry Association four major welding materials varieties. Of which approximately 14% (about 50 000 t) for export. Tubular wire production has been stagnant in 2003, but recently due to the recovery of the shipbuilding industry, the production began to increase, close to the solid wire production levels. In addition, the applicator welding production fell slightly increasing trend of solid welding wire and submerged arc welding material.
The international market, since 2003, imports of Japanese solid wire showing a growth trend. Imports about 50 000 t in 2007, and welding materials exports fairly. From South Korea's largest volume of imports, accounting for about 70%, most of the rest from Taiwan and mainland China.
Welding materials research themes are: the welding of high-quality and high performance, high efficiency welding and, more recently, in particular the introduction of important welding environment improvement ".
The study not only the solid wire to wire itself, more of a welding wire and shielding gas, welding power combined study. Will pulse active gas arc welding and Tatung Co. developed 490MPa class high strength steel in mild steel using pulsed reactive gas shielded arc welding wire combine to inhibit the welding spatter. The reason is that due to the increased rate of decline of the pulse peak current, the increase in pulse frequency (skin effect enhanced current is concentrated in the wire surface, so the electromagnetic contractility increased, the droplet move smoothly) and will mainly contain the alkali metal grease coating on the wire surface inhibit the splash effect. The use of this wire can also improve the environment of the welding operation.
During the vehicle production line, automatic welding of thin steel plate requirements in addition to reducing the above-mentioned welding spatter, also calls for a reduction to welding fumes, welding Ministry of burn and welding line intermittent welding defects. Therefore, the wire in the future to continue efforts to develop an important work.
In the automotive industry, due to worldwide stricter exhaust regulations and improve fuel efficiency requirements, the requirements of the automotive lightweight growing in the exhaust system components, corrosion resistance, heat resistance and excellent parts .
Automotive exhaust systems, exhaust manifold has been changed by the casting greater use of sheet metal welded structure, therefore, to promote research and development of ferritic wire.
Tatung to develop both high temperature strength and corrosion resistance, but also has good welding operability of the ferritic wire, which, on the wire surface plating of Cu in the WSR series wire has been commercialized, applicable in many parts of the welding. Table 1 lists the brand and chemical composition of the newly developed wire. The WSR series wire WSR42K basic wire and high temperature performance WSR42KM improve the corrosion resistance of WSR35K weld metal grain refinement of anti-welding and good crack resistance WSR42KF formed series products.
The WSR series is a high-volume manufacturing of the Tatung unique ferritic stainless steel coating wire production equipment. The device automatically wire the power to lift scales, coating, finishing wire drawing, coiling operation. Bus electrolytic pickling by H2SO4 to remove the oxide scale, in order to improve the adhesion of the plated Cu layer, the implementation of the impact of the electroless Ni processing, and then, followed by side-plated Cu side of the light the whole Roberts and take advantage of volume spool coiling.