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Application of welding materials in various fields
With the development of China's construction industry and the progress of urbanization, the amount of steel consumed in the construction industry is huge every year. According to statistics from relevant departments, the construction steel construction capacity in 2006 was about 16 million tons, including industrial plant steel structure, high-rise steel structure, large-span stadium steel structure, municipal construction steel structure and residential steel structure, which is equivalent to consumer welding materials. 25-35 million tons. It is predicted that the production capacity of various types of steel structures in 2010 will be 26 million tons, which will require 400,000-500,000 tons of various welding materials. It is predicted that all types of construction steel structures in 2015 will consume more than 40 million tons of steel. The reinforced concrete structure used in the construction process will consume more than 100 million tons of steel and wire materials every year. Except for a small amount of coarse-diameter steel, which is connected by cold extrusion sleeves, the other mainly uses steel slag pressure welding and welding rod electric fox. weld. Each year, it is required to use 10 to 130,000 tons of HJ431 and other smelting fluxes for rebar slag pressure welding, and more than 500,000 tons of J422 and other welding rods. Therefore, construction steel and corresponding welding materials are a growing hot spot in the future.
China's shipbuilding industry has used semi-automatic flux-cored wire in the country through the “Eighth Five-Year Plan” and “Ninth Five-Year Plan” for a decade. It uses a variety of simple and convenient welding equipment and processes such as fillet welder and double wire single. Molten pool CO2 welding process. In the splicing of the slats, the 3 wire and 4 wire fox welding technology is used to achieve high speed welding. In the hull closed seam welding, the vertical vertical welding technology is used, which greatly improves the efficiency of the welding operation, and the overall strength of the industry has been significantly improved. The statistics of 2007 show that China’s order volume is now ranked second in the world. However, with the traditional shipbuilding powers such as South Korea and Japan, there is still a certain gap. The Korean shipbuilding industry has succeeded in competitiveness by focusing on high value-added ships such as super-large oil tankers. From the perspective of Samsung Heavy Industries, its world market share is nearly 70% in every drilling ship with a cost of 1 trillion won (drilling crude oil and natural gas equipment in deep waters or waves). The competitiveness of Korean shipbuilding companies lies in the addition of IT technology to the shipbuilding process. Although the shipbuilding industry is synonymous with the “chimney enterprise”, Korean large shipyards have actively introduced cutting-edge technologies such as Internet-based 3D design systems and automatic operation control products to become the industry leader. On the contrary, China has a higher proportion of bulk ships (common freighters such as grain and minerals) that are relatively cheaper. With the development of the internationalization of China's shipbuilding industry, on the one hand, it puts forward higher requirements on the efficiency, processability and dust emission of existing welding consumables; on the other hand, it is built with chemical tankers and aluminum alloy vessels. Increased, there will be certain demand for various types of stainless steel, two-way steel and non-ferrous metal welding materials in the future. In 2006, China's shipbuilding completion volume was 14.52 million DWT, and about 5.6 million tons of steel were used. The corresponding consumption of welding materials was 140,000 to 160,000 tons, of which 80-90,000 tons of flux-cored wire. It is predicted that China's shipbuilding industry will reach 10.35 million tons of steel in 2010, and the corresponding demand for welding materials will be 2-3-28 thousand tons.
According to the latest statistics released by the German Automobile Manufacturers Association, China’s automobile production in 2008 exceeded Germany and the United States, ranking first in the world. According to the statistics of the association, in 2008, automobile production accounted for 17.2% of global automobile production, Germany accounted for 14.7%, while the United States only accounted for 14.6%. In 2008, China's automobile production and sales were 9,345,100 vehicles respectively. And 938,500 units, an increase of 5.21% and 67.565%, of which passenger cars produced and sold 26.074 million and 26.249 million, an increase of 4.24% and 5.24%. It is predicted that the output of various types of automobiles in China will reach 900-1 million in 2010, and the consumption of steel will be 15-18 million tons. At the same time of the development of highway transportation, the railway transportation facilities have also undergone significant changes. By 2008, China has realized three major speed-ups of railways. With the increase of railway speed, a large number of new locomotives will be put on the historical stage, March 2009. On the 16th, the Beijing Railway Bureau signed an agreement with CNR Co., Ltd. to purchase 100 new-generation high-speed EMUs with a total amount of RMB 39.2 billion. The new-generation EMU adopts 16 long-group formations, consisting of four traction power units, which are “eight-shift and eight-tow” structure, with a continuous operation speed of 350km/h and a test speed of over 400350km/h. The new generation of EMUs has a higher operating speed and correspondingly higher material requirements. In addition, the new generation of EMUs also have higher requirements for railway tracks, which have greatly promoted the development and use of steel and welding materials .
Application and development of welding materials