In recent years, with the rapid development of my country's economy, the consumption of stainless steel is increasing, and the consumption of stainless steel welding consumables is also increasing. At the same time, with the advancement and improvement of technology, the quality of stainless steel welding consumables has also improved, gradually narrowing the gap with foreign advanced levels. The following is an overview of the development status of stainless steel welding consumables in my country.

1. The development trend of the demand for stainless steel welding consumables in my country

Entering the 1990s, the consumption of stainless steel in my country has grown rapidly, from 3% of the world’s total stainless steel sales in 1990 to 10%-15% in 2000. The past two years have achieved shocking results. Speed ​​of development. According to statistics, China's apparent consumption of stainless steel reached 3.2 million tons in 2002, and the apparent consumption in 2003 was about 4.2 million tons.

The rapid growth of stainless steel consumption in my country will inevitably drive the simultaneous growth of stainless steel welding consumables. According to statistics, my country consumed 11,000 tons of stainless steel welding treaties in 2000, 12,000 tons of stainless steel welding treaties in 2001, 15,000 tons of stainless steel welding treaties in 2002, and 17,000 tons of stainless steel welding treaties in 2003. The amount of stainless steel welding wire is estimated to be about 10 of the total stainless steel welding rod. In the next few years, the consumption of stainless steel welding consumables in my country will increase at a rate of more than 10% per year.

Second, the technical level of stainless steel welding consumables in my country

In recent years, through the efforts of domestic welding technicians, the digestion and absorption of foreign imported technology and the role of some joint ventures, the level of domestic stainless steel welding materials has been greatly improved, but compared with the advanced level of foreign countries, there is still a certain gap. .

1. The formulation system of domestic stainless steel electrodes

At present, the technical level of domestic stainless steel electrodes is in a stage of further development. There are roughly three formula systems for stainless steel electrodes sold on the market. The first is that some manufacturers continue to use the previous formula technology ideas of titanium calcium type partial alkali. The outstanding advantage of this kind of electrode is that the electrode has excellent mechanical properties of deposited metal, and it is not easy to appear pores during the welding process, and it is easy to ensure the welding quality. However, its shortcomings are also very obvious. The welding rod has poor welding performance, large spatter, and poor forming. The deposited metal of the electrode increases carbon, which easily reduces the corrosion resistance of the weld metal. In some manufacturers that have been slow to improve technology or lack technical personnel, more of these electrodes are produced. The second is the electrode produced by the idea of ​​titanium matching formula. This kind of welding rod is resistant to redness, has excellent welding process performance, small spatter, and beautiful shape. The deposited metal of the welding rod is not easy to increase carbon, and it is easy to ensure the corrosion resistance of the weld metal. The disadvantage is that the mechanical properties of the deposited metal of the electrode are not as good as that of the titanium-calcium type electrode, and the weld is prone to hot cracks. If the welding is not handled properly, it is prone to pores. The third type is the welding rod produced by the technical idea between the titanic acid type and the titanium calcium type formula. This kind of electrode basically takes into account the advantages of calcium titanium and titanic acid electrodes, has better welding process performance and mechanical properties, and is more suitable for my country's national conditions, especially in some occasions where welding is not performed according to the specifications. The Jinwei brand welding rod produced by Beijing Jinwei Welding Materials Co., Ltd. adopts the third technical idea.

The stainless steel electrodes produced by well-known foreign welding consumables companies, such as AVESTA, SANDVIK, and ESAB, basically belong to the calcium titanate formula system.

2. Current status of domestic stainless steel electrode manufacturing technology

Compared with the advanced level of foreign stainless steel electrodes produced in the traditional way, in addition to the gap in formula technology, the low level of manufacturing technology of welding electrodes is also an aspect. Most of the stainless steel electrodes in the same industry are manufactured by the previous manufacturing method, that is, the double "S" mixer is used for stirring, and the potassium-sodium mixed water glass with a mold (M) of about 3.0-3.2 is used as the binder. The disadvantage of the welding rod produced by this manufacturing method is that the electrode coating is brittle. When it is baked at a high temperature (about 350℃), the electrode coating will become brittle and crack, and the electrode coating will fall off during the welding process. Welding quality. Because of the low drying temperature required by the titanium-calcium partial alkali formula system, the electrode is generally about 250℃. At this drying temperature, the coating of the electrode becomes brittle and does not affect the welding quality. If the titanic acid type electrode is produced in this manufacturing method, due to its high drying temperature, generally around 350°C, the electrode coating will become brittle and crack, and the welding quality cannot be guaranteed.

The production of stainless steel electrodes abroad uses a roller mixer, which uses a mixture of soda water glass with a modulus of 2.0-2.4 and potassium water glass with a modulus of 3.0-3.2 as the binder. The stainless steel electrode produced in this way has a smooth appearance and high strength of the coating. After being dried at a high temperature of about 350°C, the coating will not become significantly brittle. If the production of titanic acid type stainless steel welding rod meets another similar level, this manufacturing process can only be used. At present, only a few domestic manufacturers such as Beijing Jinwei Welding Materials Co., Ltd. have roller mixers.

It should be said that compared with foreign countries, the technical level of domestic stainless steel welding rods differs not only in formula, but also in the backwardness of equipment.

Development status of stainless steel welding consumables in my country

2004-07-15 00:00 Source: My Steel Author: mysteel see market supervision and information using a mobile phone

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In recent years, with the rapid development of my country's economy, the consumption of stainless steel is increasing, and the consumption of stainless steel welding consumables is also increasing. At the same time, with the advancement and improvement of technology, the quality of stainless steel welding consumables has also improved, gradually narrowing the gap with foreign advanced levels. The following is an overview of the development status of stainless steel welding consumables in my country.

1. The development trend of the demand for stainless steel welding consumables in my country

Entering the 1990s, the consumption of stainless steel in my country has grown rapidly, from 3% of the world’s total stainless steel sales in 1990 to 10%-15% in 2000. The past two years have achieved shocking results. Speed ​​of development. According to statistics, China's apparent consumption of stainless steel reached 3.2 million tons in 2002, and the apparent consumption in 2003 was about 4.2 million tons.

The rapid growth of stainless steel consumption in my country will inevitably drive the simultaneous growth of stainless steel welding consumables. According to statistics, my country consumed 11,000 tons of stainless steel welding treaties in 2000, 12,000 tons of stainless steel welding treaties in 2001, 15,000 tons of stainless steel welding treaties in 2002, and 17,000 tons of stainless steel welding treaties in 2003. The amount of stainless steel welding wire is estimated to be about 10 of the total stainless steel welding rod. In the next few years, the consumption of stainless steel welding consumables in my country will increase at a rate of more than 10% per year.

Second, the technical level of stainless steel welding consumables in my country

In recent years, through the efforts of domestic welding technicians, the digestion and absorption of foreign imported technology and the role of some joint ventures, the level of domestic stainless steel welding materials has been greatly improved, but compared with the advanced level of foreign countries, there is still a certain gap. .

1. The formulation system of domestic stainless steel electrodes

At present, the technical level of domestic stainless steel electrodes is in a stage of further development. There are roughly three formula systems for stainless steel electrodes sold on the market. The first is that some manufacturers continue to use the previous formula technology ideas of titanium calcium type partial alkali. The outstanding advantage of this kind of electrode is that the electrode has excellent mechanical properties of deposited metal, and it is not easy to appear pores during the welding process, and it is easy to ensure the welding quality. However, its shortcomings are also very obvious. The welding rod has poor welding performance, large spatter, and poor forming. The deposited metal of the electrode increases carbon, which easily reduces the corrosion resistance of the weld metal. In some manufacturers that have been slow to improve technology or lack technical personnel, more of these electrodes are produced. The second is the electrode produced by the idea of ​​titanium matching formula. This kind of welding rod is resistant to redness, has excellent welding process performance, small spatter, and beautiful shape. The deposited metal of the welding rod is not easy to increase carbon, and it is easy to ensure the corrosion resistance of the weld metal. The disadvantage is that the mechanical properties of the deposited metal of the electrode are not as good as that of the titanium-calcium type electrode, and the weld is prone to hot cracks. If the welding is not handled properly, it is prone to pores. The third type is the welding rod produced by the technical idea between the titanic acid type and the titanium calcium type formula. This kind of electrode basically takes into account the advantages of calcium titanium and titanic acid electrodes, has better welding process performance and mechanical properties, and is more suitable for my country's national conditions, especially in some occasions where welding is not performed according to the specifications. The Jinwei brand welding rod produced by Beijing Jinwei Welding Materials Co., Ltd. adopts the third technical idea.

The stainless steel electrodes produced by well-known foreign welding consumables companies, such as AVESTA, SANDVIK, and ESAB, basically belong to the calcium titanate formula system.

2. Current status of domestic stainless steel electrode manufacturing technology

Compared with the advanced level of foreign stainless steel electrodes produced by traditional methods in China, in addition to the gap in formula technology, the low level of manufacturing technology of welding electrodes is also an aspect. Most of the stainless steel electrodes in the same industry are manufactured by the previous manufacturing method, that is, the double "S" mixer is used for stirring, and the potassium-sodium mixed water glass with a mold (M) of about 3.0-3.2 is used as the binder. The disadvantage of the electrode produced by this manufacturing method is that the electrode coating is brittle. When it is baked at a high temperature (about 350℃), the electrode coating will become brittle and cracked, and the electrode coating will fall off during the welding process. Welding quality. Due to the low drying temperature required by the formula system of titanium-calcium partial alkali, the electrode coating is generally about 250℃. At this drying temperature, the coating of the electrode becomes brittle and will not affect the welding quality. If the titanic acid type electrode is produced in this manufacturing method, due to its high drying temperature, generally around 350°C, the electrode coating will become brittle and crack, and the welding quality cannot be guaranteed.

The production of stainless steel electrodes abroad uses a roller mixer, which uses a mixture of soda water glass with a modulus of 2.0-2.4 and potassium water glass with a modulus of 3.0-3.2 as the binder. The stainless steel electrode produced in this way has a smooth appearance and high strength of the coating. After being dried at a high temperature of about 350°C, the coating will not become significantly brittle. If the production of titanic acid type stainless steel welding rod meets another similar level, this manufacturing process can only be used. At present, only a few domestic manufacturers such as Beijing Jinwei Welding Materials Co., Ltd. have roller mixers.

It should be said that compared with foreign countries, the technical level of domestic stainless steel welding rods differs not only in formula, but also in the backwardness of equipment.

3. Stability of domestic stainless steel electrode technology

Compared with foreign countries, the quality of domestic stainless steel welding rods also has a certain gap in stability. The first reason is that the manufacturers do not control strictly during production; the second is the unstable quality of domestically produced raw materials, especially the main stainless steel welding rod core wire.

At present, the domestic stainless steel welding rod core wire is mainly provided by some small and medium-sized enterprises in Jiangsu. The outstanding problems are:

(1) The batch is small, a furnace number is generally 700-1000kg, and the batch is only 2-3t. The small batch size causes the chemical composition of the electrode to be unstable, which makes the quality of the electrode unstable.

(2) Due to backward equipment and technology, high impurity content affects welding quality. The core wires of foreign-produced welding rods are 11-12t with a small furnace number and 20-30t with a large furnace number. The chemical composition of the furnace numbers is very close, and the carbon and impurity content is very well controlled. This is also a foreign stainless steel electrode. An important reason for the stable volume.

To achieve the same quality and stability of domestic stainless steel welding rod as abroad, the quality and stability of raw materials must be guaranteed. Stainless steel electrode manufacturers must change the outdated production technology to keep up with the international advanced level. Manufacturers of stainless steel accessories must also pay attention to quality stability. When purchasing raw materials, domestic welding electrode manufacturers should pay attention to choosing those produced by manufacturers with large production batches and advanced technology.

4. Stainless steel welding consumables used in important occasions and with high quality requirements still need to be imported

At present, in some high-demand occasions, it is still necessary to import stainless steel welding materials, such as urea-grade stainless steel welding rods, hydrogenation reactor welding rods used in the petrochemical industry, duplex stainless steel welding rods, and special heat-resistant stainless steel welding rods. These electrodes must be localized. First, the electrode manufacturer must improve its technical level. Second, the raw material supplier must provide raw materials that meet the requirements. The special Chang steel wire manufacturer must provide the raw materials that meet the requirements, especially the steel wire manufacturer. Of high-quality electrode core wires. Otherwise, no matter how hard the electrode manufacturer works, it will not be able to reach the level of similar foreign products.

5. Welding wire

With the development of my country's economy, the level of automation is getting higher and higher, and the amount of welding wire is increasing. The gap between my country's stainless steel welding wire and foreign countries is larger than that of welding rods. The stainless steel welding wire sold on the market has great deficiencies in the internal and external quality. TIG welding wire has the dual problems of welding wire appearance and internal quality. Except for a few joint ventures, the products produced by most manufacturers are far below the level of similar foreign products. The most prominent problem of MIG welding wire is its poor appearance and insufficient wire feeding, especially in the occasions where the robot or manipulator welding is highly automated. Stainless steel flux-cored welding wire has just started in my country, but its development is relatively fast. Domestic manufacturers such as Antai, Tianjin Sanying, Tiantai, Jintai and other manufacturers are producing and selling stainless steel flux-cored welding wire; China’s Taiwan Sinosteel, South Korea’s Gaoli, Hyundai and some European manufacturers are also actively expanding the flux-cored welding wire market in mainland China.

At present, domestic stainless steel TIG welding wire, MIG welding wire, and flux-cored welding wire have begun to form a certain scale. With the improvement of my country's automation level, the consumption will show a substantial increase, but the quality of most domestic stainless steel welding wires in my country is worrying. . The level of welding wire manufactured in my country is not high, and the gap with foreign countries is that in addition to poor chemical composition and high impurity content caused by steelmaking, the crux of the problem lies mainly in equipment and production processes. To produce high-quality welding wire, we must adopt advanced production equipment and improve the existing production process.

The quality of welding wire is not high. In addition to manufacturing factors, the backwardness of standards is also an important issue. The current standards for welding stainless steel wire in my country are GB4242-1984 and YB/T5092-1996, which basically use the Soviet standard system, such as standards The H0Cr20Ni10Ti welding wire in H0Cr20Ni10Ti has poor liquidity of molten iron and is prone to defects. It no longer exists in the AWS standard, and it is still widely used in China. The AWS standards for the chemical composition of the welding wire all use medium Si or high Si, and the welding wire produced according to the current standard contains medium and low Si, and the low Si content directly causes poor liquidity of the molten iron and poor welding quality. Therefore, the current stainless steel welding wire standard should be revised as soon as possible to make it in line with international standards.

3. Suggestions

China has now become the world's largest consumer of stainless steel materials, and at the same time it has become the world's largest consumer of stainless steel welding materials, and it is also becoming a hot market for all welding material manufacturers in the world. Competition will be more intense. In order to adapt to this situation, the recommendations are as follows: