Current situation and analysis of the hottest weld

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According to statistics, more than half of the world's steel production is made into steel products by welding process. Welding, as a technology that permanently connects materials and has a given functional structure, has been able to stretch, shrink, bend, tear, shear, 180 degree peel and 90 degree peel experiments, which have penetrated into all fields of manufacturing

How to solve the failure of connecting the testing machine to the computer

the welding process depends on the welding equipment, which has become an important processing equipment in modern industry

1. 2007 annual statistics

1.1 overall situation

in 2007, through the investigation and statistics of 40 major welding machines, cutting machines and part-time manufacturing plants, large welding auxiliary equipment plants (including 37 welding equipment production enterprises and 3 auxiliary equipment parts and components production enterprises), the main economic indicators are shown in table 1:

from the above overall data, following the trend of sustained macroeconomic development in China last year, In 2007, the production and sales of the domestic welding machine industry increased compared with the same period of the previous year, and the total profit increased significantly, showing a continuous booming situation, and the overall economic situation is running well. However, 11 of them still suffered losses, reflecting the survival of the fittest in market competition

1.2 production development

in 2007, the total output of electric welding machines of 37 home appliance welding machine enterprises reached 742543, a decrease of 14.38% over the same period last year. Among them:

a. the output of AC arc welding machines accounted for 21.96% of the total output, a decrease of 15.45 percentage points over the same period of the previous year. The production reached 163295 units, a decrease of 47.51% over the same period of the previous year, but the output of non-standard AC arc welding machines increased by 288.14% over the same period of the previous year

b, the proportion of DC arc welding machine output in the total output continued to rise, accounting for 36.74% of the total output. Among them, the output of inverter DC arc welding machine increased by 91.11% over the previous year

c, the proportion of automatic and semi-automatic welding machines in the total output increased by 2.58 percentage points over the same period last year, accounting for 33.71% of the total output

d, the proportion of resistance welding machine output in the total output decreased by 4.86 percentage points compared with the same period of last year, accounting for 2.69% of the total output

e, the output of special, special and other welding machines decreased by 9.42% over the same period last year, but the output of CNC cutting machines, complete sets of welding equipment and other welding machines showed an upward trend

in 2007, the output of high-tech products increased significantly to varying degrees, among which inverter DC arc welding machine is a prominent representative

1.3 market sales

1.3.1 domestic market situation

in 2007, although affected by national macro-control policies, high prices of main raw materials, rising labor costs, fierce market competition and other factors, the domestic welding machine industry still maintained the momentum of rapid growth, achieved good results, and achieved remarkable economic benefits

a. the market competition is more intense. The high-end market is basically still occupied by foreign products. The supply of medium and low-end markets exceeds the demand. Price competition has become the main means of competition, and the profit space of products has been further reduced with the rise in the prices of raw and auxiliary materials. While the price of copper and iron rises, the price of electronic devices gradually decreases, which highlights the cost advantage of inverter welding machines. In 2007, the inverter DC arc welding machine increased by 91.11% on the basis of the rapid growth in 2006 and 2005. b. The market demand has changed, and products with medium and high technology content are increasingly favored by users

c. market space increases. The overall technical level and comprehensive strength of the industry have been improved

d. enterprises strengthen internal management in many ways, attach importance to improving product quality, constantly increase investment in science and technology, and at the same time, they also begin to gradually integrate with international standards in business philosophy

1.3.2 external sales

with the improvement of the product technology level of China's electric welding machine industry, the transfer of the world's processing and manufacturing industry to China and the role of price leverage, the export of China's electric welding machine products soared in 2007, and the total export of 37 enterprises' electric welding machines was 858.216 million yuan (excluding auxiliary machinery and accessories), an increase of 96.55% over the same period last year, but the export volume decreased by 35.10% over the same period last year. It can be seen from table 4 that the grade of China's export welding equipment has been improved, and some products with high technical content have entered the international market

1.4 management and reform

since the reform and opening up, after a period of adjustment, the nature of enterprises in China's electric welding machine industry has changed greatly. At present, non-state-owned enterprises account for the vast majority. Enterprises with non-state-owned capital (including joint-stock, Sino foreign joint venture, wholly foreign-owned and private enterprises) have reached or exceeded 96% of the total in terms of output value, output and main business income. Enterprises with non-state-owned capital have developed rapidly in recent years, and the new mechanism established is more market-oriented, more dynamic, more powerful vitality and market competitiveness. China's welding equipment manufacturing industry has been fully activated

2. The development of inverter welding machines in China is mainly driven by the development of power electronic devices. Since the advent of fast thyristor, transistor (GTR), gate turn off thyristor (GTO), MOS FET and insulated gate transistor (IGBT), they have been used as switching elements in welding equipment by using the inverter principle, and thyristor inverter welding machines, transistor inverter welding machines FET inverter welding machine and IGBT inverter welding machine

in industrialized countries, inverter technology has been widely used in manual arc welding, TIG welding, especially MIG/MAG/CO2 automatic and semi-automatic welding, and has also been applied in resistance welding machines. Several major welding machine manufacturers in the world have gradually completed the serialization of their products

because inverter welding machine has the advantages of good welding performance, fast dynamic response speed, good dynamic characteristics, high efficiency, high welding speed, multi-function, which is conducive to the realization of welding mechanization and automation, it has become the development direction of arc welding power supply. In 2000, China listed IGBT inverter power supply in the high-tech product catalogue, becoming the only product listed in the welding equipment industry

annual growth rate of inverter welding machine output in recent years

the output of inverter welding machine has increased rapidly every year in recent years, if the operation and protection personnel have received better training. Since the second half of 2002, on the premise that the sharp rise in the price of raw and auxiliary materials has further reduced the profits of welding machines, the price of electronic devices has gradually decreased, which has highlighted the cost advantage of inverter welding machines. Since 2003, its output growth has been significantly higher than in the past, with an increase of 150.34% in 2006. Its popularization and application speed has exceeded the development level of the world in the same period

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