In recent years, with the rapid development of the national economy, as well as international economic integration after accession to the WTO and the continuous influx of the country, the foreign advanced welding and cutting equipment, welding and cutting companies face a multitude of strong international market as well as domestic competition is mounting accelerate the restructuring and reorganization of the market, on the basis of industry specialization. From the view of the nature of the enterprises in recent years, Beijing Essen Welding Show exhibitors, joint ventures, wholly-owned enterprises, private enterprises, joint-stock enterprises increased, truly reflect the course of development of the welding industry and changes in industry structure; national key projects the start, but also for the production of welding and cutting equipment to provide good opportunities for development and broad market space, huge market demand is bound to bring to the welding and cutting corporate huge market opportunity. Based on this, this issue in conjunction with the Chinese Mechanical Engineering Society and its welding branch to carry out the "Welding and Cutting Products Applications Survey, and the findings to be published in the Eighth Beijing Essen Welding Show.
Purpose of the survey Any industry, any company (enterprise), grasp the dynamic of the industry, and understanding of user needs is the key to develop appropriate marketing strategies. Since the magazine of the "the mechanical workers" (thermal processing) has been closely following the development of the welding industry, the reported advanced welding and cutting technology, promote the use of state-of-the-art welding and cutting equipment, has a wide and loyal audience. Learn more about the changes in industry structure adjustment of welding and cutting products, application status to explore welding and cutting near-term needs of the user in order to better product research and development, production and marketing programs developed for welding and cutting equipment companies to provide the basis for the user optional equipment to provide basis for decision making, and to better serve the industry. Articles investigation since May 2003, the application of welding and cutting products.
I. Introduction Welding Wireand cutting technology as an important means of modern advanced manufacturing technology in all fields of the construction of China's national economy has been widely used in the 20th century, made an important contribution to the development of the industrial economy. Welding as a traditional today is facing new opportunities and challenges of the 21st century: on the one hand, the vigorous development of advanced manufacturing technology from information technology, integrated, systematic, flexibility and other aspects of welding technology The development of increasingly high requirements of welding technology to produce a qualitative leap in terms of breadth and depth; On the other hand, changes in the industry structure adjustment of welding and cutting enterprise showed the coexistence of new warlords, common prosperity and new pattern, reflecting the level of automation for welding machinery continues to improve, with high parameters, high life, large-scale, ultra-fine features such as welding products continue to emerge; rapid increases in the degree of welded structure design innovation; welding new techniques and new methods of production practical application cycle is much shorter; efficient high-quality welding materials, welding equipment, serialization and localization are climbing to a new level; welding complementary standardization system; private, joint ventures and foreign-funded enterprises has become increasingly active in the Chinese market, advanced welding technology production and integration into the international development. The mechanical workers Magazine in the 53 years of development, and always adhere to the promotion of advanced welding technology, industry, enterprise services, "the responsibility of the purpose of the magazine over the years has been concerned with the development of the welding industry. Especially in recent years, but also keep in mind the development of hot spots to track the welding industry, remains the most "intimate contact" with the welding industry friends, continuous innovation, and strive to make new contributions to the development of the Welding Electrode Materials industry. Therefore, in order to further understand the application of the status quo after the change in industry structure adjustment of welding and cutting products, explore the near-term needs of the users of welding and cutting products and the development trend of the industry, the magazine of "mechanical workers make use of the advantage of a huge loyal audience, as well as The magazine has a large, covering a wide range of features, in conjunction with the Chinese Mechanical Engineering Society and its welding branch to launch a nationwide investigation which lasted five months, "Welding and Cutting Products. Survey as of September 30, 2003, received a total of 627 valid responses were. We hope that through the analysis of the information obtained in the survey, to give the majority of welding and cutting equipment companies to provide reference for the development of product R & D, production and marketing programs, and purchase equipment to provide a basis for decision making to the majority of users, at the same time better serve the industry. The survey has been some local Welding Society, the Association, as well as the majority of welding and cutting the enterprise and welding experts vigorously support and help, but also actively cooperate with the vast number of users, To repay all better, now findings published as follows.
Second, the survey group analysis 1. Geographical distribution of the survey groups As can be seen from the survey groups in which the geographical distribution: East China, North China, Central South region the number of people participating in the survey were ranked first, second and third. The survey shows that: the most economically developed regions - East China most number of people participating in the survey, accounting for 43.28%; followed by the North and South regions is 19.40% and 15.82%, respectively. A certain level, the survey data reflect the depth and breadth of application of welding and cutting products in the region. 2. Sector Breakdown Vary due to the extremely wide range of welding and cutting products, the demand of various industries, enterprises and various products of welding and cutting equipment, so in order to better understand the demand of various industries for welding and cutting equipment, we in the The selected welding and cutting products "is used more often several major industries in the survey. From the survey results, the personnel involved in the investigation of 25.73% from the machinery manufacturing industry, 18.05% from spare parts manufacturing industry, to 8.92% from the pressure vessel. 8.30% from the automotive and motorcycle industry, 7.88% from sheet metal processing ... specifically refer to Table 2. Welding and cutting products are the basis of technology and equipment available to all walks of life, and therefore its main market demand basic industries. The row in the top few in the basic industries industry: machinery manufacturing, spare parts manufacturing, pressure vessels, automobile, motorcycle, sheet metal processing, construction, and mold etc.. The results from the survey, the overall demand of industry for welding and cutting products for the industry, demand is also different. Therefore, all enterprises in the development of a program of research and development, production and marketing, the different sectors should take the appropriate measures in order to better meet the market demand for basic industries. 3. Business Type The survey on your type of business, the regional distribution. Therefore, due to the scope of application of welding and cutting products is extremely broad, and is synchronized with the development of the national economic construction development in the country will be developed to shift the focus to the basic industries (energy, transport), information industry, railway, highway, automobile manufacturing and construction and other industries, the main type of business for regional application of welding and cutting products also change accordingly. Especially after joining the WTO, enterprises through organizational restructuring to adapt to international competition, to promote the restructuring and reorganization. As can be seen from Table 3 survey: Although the state-owned and private enterprises still occupy a large proportion of 37.61%, 27.76%, respectively ranked first and second, compared with the previous downward trend; wholly foreign-owned / up to 11.05% of the proportion of the joint venture, joint-stock enterprises accounted for 17.91%, showed a strong upward trend. Groups where the geographical distribution of the type of business also shows that these trends: the top three areas of state-owned enterprises 81.8% Northwest, Southwest accounted for 54.55% of North China accounting for 47.69%; followed by South Africa accounted for 35.86%, Northeast 28.57 %, East of 26.22 per cent. Private enterprises, particularly in the East China highlights, the proportion reached 34.49%; followed by China and South Africa accounted for 30.18%, the northeast region accounted for 25% of North China accounted for 21.52%. Joint venture in east China the proportion of up to 16.56%, followed by China and South Africa accounted for 13.21%, the northeast region accounted for 10.72%. From the above survey groups, the geographical distribution of the type of business where the more economically developed regions of the joint venture, the joint venture has the advantage of technology, capital and management, and enjoy various preferential policies, so that it is in a favorable position in the market competition . In addition, these joint ventures have higher starting point, used in welding and cutting products requirements, so that the production of good quality products, account for a higher market share. In recent years, a variety of advanced welding and cutting equipment and automatic and semi-automatic welding machine products constitute more than substantial increase, using advanced welding and cutting equipment joint venture in which play an important role.
Beam combination by a single electron, photon, electron, ion or two or more kinds of particles. The heat source belonging to the high power density: plasma arc, electron beam, laser beam, laser beam and the composite heat source + Arc (TIG, MIG, Plasma).
This high-energy beam welding the main areas of concern are: (1) high-energy beam size of the facility - the power of large, and processability parts (even parts integration) the large-scale. ② the development of new equipment, such as pulse work, and short-wavelength lasers. ③ equipment intelligent and flexible processing. ④ improve the beam quality and diagnosis. ⑤ beam, the workpiece, the study of the mechanism of interaction between the process media. ⑥ composite beam. ⑦ theWelding Electrodeof the new material. ⑧ the expansion of application fields.
1, the latest progress of laser welding
1.1 new laser
(1) DC the slat (DCSlab) CO2 laser, (2) the diode-pumped YAG laser, (3) CO 2 laser, (4) a semiconductor laser (5) of the excimer laser.
1.2 laser power of large-scale, pulse and high beam quality mode
United States PRC, for example, a few years ago, the CO2 laser power for cutting 1500 ~ 2000W, 4000 ~ 6000W leading products in recent 6000W can cut the thickness of the stainless steel, carbon steel thickness of 35mm and 40 mm, respectively.
1.3 Equipment intelligent and flexible processing
YAG laser available optical fiber transmission to the processing of a great deal of convenience.
Its main features are: ① The use of a machine. ② using a laser machine can be a multi-position (up to 6) processing. ③ fiber length up to 60m. ④ open the control interface. ⑤ remote diagnosis. The 1.4 beam the composite
The most important is the laser - Arc composite. Deep penetration welding, the plasma is generated above the bath, the composite processing, the laser produced plasma is conducive to the stability of the arc; composite processing can improve the processing efficiency; poor welding of welding of materials such as aluminum alloy, dual phase steel can be improved ; increase welding stability and reliability; usually, laser Jiasi, welding is very sensitive, by a composite with the arc, the change easily and reliably.
Laser - arc hybrid laser and TIG, Plasma, and GMA through the interaction of laser and arc, to overcome the deficiencies of each method, and produce a good composite effect.
GMA low cost, using the filler wire, applicability, the disadvantage is melting shades, Mig Welding Electrode, workpiece withstand thermal loads. Laser welding can form deep and narrow welds, welding speed, low heat input, but high investment, high accuracy requirements of workpiece preparation, poor adaptability of materials such as aluminum. Laser-GMA composite effect: the arc increase the bridging of the gap, for two reasons: First, the filler wire, a wide range of electric arc heating; arc the power decided weld top width; laser produced plasma Less small arc ignition and maintenance of resistance, so that the arc is more stable; laser power determines the depth of the weld; Furthermore, composite led to increased efficiency and welding adaptive enhancement.
From the energy point of view, laser arc hybrid welding efficiency improve very significantly. This is mainly based on two effects, the first high energy density results in a higher welding speed; second superposition effect of the two heat sources interaction.