Development Status of 2.0MM-5.0MM Submerged ARC Welding Wire in China
In recent years, with the rapid development of China's economy, the amount of stainless steel is growing, 2.0MM-5.0MM Submerged ARC Welding Wire is also increasing the amount. At the same time with the technical progress and improve, 2.0MM-5.0MM Submerged ARC Welding Wire quality also will increase, and gradually narrow the gap with the advanced level of foreign countries. Here on China's 2.0MM-5.0MM Submerged ARC Welding Wire to do an overview of the status quo.
First, China's 2.0MM-5.0MM submerged arc welding demand trends
Into the 20th century, 90 years to industry, China's stainless steel consumption grew rapidly from 1990, the world's total sales of stainless steel rose to 3% in 2000 to 10% -15%, nearly two years is made shocking Development speed. According to statistics, in 2002 China's apparent consumption of stainless steel has reached 3.2 million t, 2003 apparent consumption of about 4.2 million t.
China's rapid growth in consumption of stainless steel, will inevitably lead 2.0MM-5.0MM submerged arc synchronous growth. According to the statistical results, in 2000, China consumed a total of 2.0MM-5.0MM Submerged ARC Welding Wire of about 11,000 t, in 2001 consumed a total of 2.0MM-5.0MM Submerged ARC Welding Wire of about 12,000 t, 2002 consumption of 2.0MM-5.0MM Submerged ARC Welding Wire of about 15,000 t, in 2003 consumed a total of 2.0MM-5.0MM Submerged ARC Welding Wire of about 17,000 t. The amount of stainless steel wire is estimated to be about 2.0MM-5.0MM Submerged ARC Welding Wire total of 10 or so. The next few years China's 2.0MM-5.0MM submerged arc welding consumables will be more than 10% annual growth rate.
Second, China's 2.0MM-5.0MM submerged arc welding technology level
In recent years, through the efforts of domestic welding technology staff, the introduction of foreign technology to digest and absorb the role of some joint ventures, the domestic 2.0MM-5.0MM Submerged ARC Welding Wire has been greatly improved, but compared with foreign advanced level, There is a certain gap.
1, the domestic 2.0MM-5.0MM submerged arc welding machine formula system
At present, the technical level of 2.0MM-5.0MM Submerged ARC Welding Wire is in a stage of further development. Market sales of 2.0MM-5.0MM submerged arc wire formulations generally have three, the first is some manufacturers continue to use the previous titanium calcium type alkaline formula technology ideas. The advantages of this electrode protruding electrode welding metal is excellent mechanical properties, welding process is not prone to pores, easy to ensure the quality of welding. But its shortcomings are also very obvious, poor welding rod welding process performance, splashing large, forming bad, welding electrode deposited carbon, easy to reduce the corrosion resistance of the weld metal. In some technology to improve the relatively slow or lack of technical staff of the manufacturers, the production of this electrode more. The second is the use of titanium formula with the idea of production of the electrode. This kind of electrode is resistant to redness, excellent welding performance, small splash, beautiful appearance, easy to add carbon welding electrode, easy to ensure the corrosion resistance of weld metal. The drawback is that the welding properties of welding metal metal as titanium calcium electrode, weld prone to hot cracks, such as improper handling when welding, prone to pores. The third is the use of titanium titanate and titanium calcium formula between the technical ideas of the production of the electrode. This electrode basically takes into account the advantages of titanium and titanic acid electrode, with good welding process performance and mechanical properties, more suitable for China's national conditions, especially in some do not follow the specifications of the occasion of welding. Beijing Jinwei Welding Materials Co., Ltd. production of gold Wei licensing electrode is used in the third technical ideas.
2, the domestic 2.0MM-5.0MM Submerged ARC Welding Wire manufacturing process level status quo
Domestic production in the traditional way 2.0MM-5.0MM Submerged ARC Welding Wire compared with the advanced level, in addition to the gap between the formulation technology, the electrode manufacturing process is not high is one aspect. With the 2.0MM-5.0MM Submerged ARC Welding Wire manufacturing are used in the past most of the manufacturing methods, that is, with a double "S" mixer mixing, the use of mold floor (M) for the 3.0-3.2 or so of sodium and sodium mixed water glass Binder. In this way the production of the electrode, the drawback of the electrode coating is more brittle, after high temperature (350 ℃ or so) baking, the electrode coating will brittle crack, welding process in the welding dress will fall off, the impact Welding quality. As the titanium calcium type alkaline formula of the electrode requirements of the drying temperature is low, generally about 250 ℃, in this drying temperature, the electrode coating brittle is not obvious, will not affect the welding quality. If the production of titanium oxide electrode in this way, because of its high drying temperature, generally about 350 ℃, the electrode coating will become brittle crack, can not guarantee the quality of welding.