Seiko Steel is mainly engaged in the processing of large-scale steel structure projects such as high-rise, super high-rise, stadium and truss. The years of construction and production experience has won a good reputation and reputation in the steel structure industry. At present, the main processing projects include the Beijing Stadium “Bird's Nest†project, the Shenzhen Bay Sports Center “Spring Festival†project, the Shanghai World Trade Center and the Guangzhou TV Tower “Little Man Waist†project, as shown in Figures 1 to 4.
Figure 1 National Stadium "Bird's Nest
Figure 2 Guangzhou TV Tower "small waist"
Figure 3 Shenzhen Bay Sports Center “Spring Festivalâ€
Figure 4 Guangzhou East Tower
In the process of steel structure processing and on-site installation, CO 2 solid wire welding gas shielded welding is widely used because of its high welding efficiency, low production cost, flexible operation and easy observation of molten pool. The main disadvantage of CO 2 solid wire welding is that the welding spatter is large, which is also a big problem that plagues the welding industry. Usually the welding spatter can only be minimized and cannot be completely eliminated. In order to overcome the characteristics of CO 2 solid wire welding, it is difficult to control, combined with the actual situation of our company, the following methods are adopted to reduce the increase of production cost caused by large welding spatter.
(1) Selecting reasonable welding parameters can effectively reduce welding spatter. Reasonable selection of welding parameters within the specification requirements is one of the methods to reduce welding spatter. In the welding process, small current and small voltage should be used for welding, which can reduce welding spatter properly.
(2) New methods and methods such as anti-splashing agent are applied to engineering practice In recent years, in order to reduce the production cost of manual cleaning of welding spatter, a welding anti-splashing agent has been developed. Our company found the following characteristics in the test and application of welding anti-splash agent: after welding with anti-splash agent, the welding splash is easy to remove, which can effectively reduce the labor intensity of workers and achieve cost saving; but for the components with anti-corrosion requirements After the application of the welding anti-splash agent, the adhesion of the anti-corrosion coating of the component is lowered, and the paint peeling off or the paint sag occurs, and therefore, it is not suitable for the component having the anti-corrosion requirement. In view of the above characteristics, our company requires the use of anti-splashing agents for core tubular steel columns, beams and other components that do not need to be coated with anti-corrosion coating. For components with anti-corrosion requirements, it is strictly forbidden to use anti-splashing agent welding.
(3) Using a new material, non-plated copper solid wire for engineering welding, copper plating, solid wire, as shown in Figure 5, first, copper-plated solid wire will form a copper plating solution during processing, which will be produced during welding applications. A large number of acid-base mist gas and particulate dust have a great impact on the environment. Secondly, the appearance of the weld of the copper-plated solid wire after welding is poor, and the performance is as follows: the weld is convex after welding, and the color is dark. In addition, the copper-plated solid wire is prone to rust during storage. The state advocates energy conservation and environmental protection, and encourages the development and application of new materials. In response to the above problems, our company currently uses non-plated copper solid wire to weld the components, as shown in Figure 6. The non-coppered solid wire reduces the weld spatter during the welding process, while ensuring the appearance quality of the weld and reducing the harm to the health of workers during the welding process.
Figure 5 copper plating wire
No 6-plated copper wire
(4) Welding with CO 2 +Ar mixed gas Generally, pure CO 2 gas can ensure the penetration of the weld when welding, but the arc is unstable, resulting in a large amount of splash and poor weld appearance; the pure Ar welding arc is stable. But the penetration is small. Combined with the characteristics of the above two gas weldings, the welding spatter can be effectively reduced by using a mixed gas welding of 80% CO 2 + 20% Ar, which is widely used in steel structure welding engineering, as shown in Fig. 7.
Figure 7 80% CO2+20% Ar solid wire used in engineering welding drawings
(5) Using the current domestic advanced spatter-free fast compression arc welding machine for welding Sichuan Marai welding machine model DSP-500 can effectively reduce welding spatter, as shown in Figure 8 and Figure 9.
Figure 8 Sichuan Marui Splashless Welder
Figure 9 Samples welded by Mare welder (not at the surface)
With the call of national energy conservation and emission reduction, steel structure engineering is widely used in people's production and life as a green building. In the process of manufacturing and processing steel structures, under the premise of ensuring the quality of welds, the cost of solid wire welding is low. With a wide range of applications, the proportion will be larger and larger; at the same time, green welding materials such as copper-free solid wire will occupy a place in the welding consumables in a certain period of time, and will lead a "green". Welding consumables revolution.
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Main features of Marry DSP digital high pulse inverter MIG welding machine:
Marie company in the first generation pulsed MIG welding machine on the normal development of second-generation high-speed pulse MIG welding machine, solves the pulsed MIG welding thick, industrial arts, a thin carbon steel sheet, and further enhance the bonding of aluminum and Alloy, stainless steel process.
1. Suitable for high strength steel, high alloy steel, low alloy steel, carbon steel, stainless steel, aluminum and its alloys, brass, pure copper, galvanized sheet, brazed chrome nickel plate and other metals.
2. Almost no splash.
3. The high-speed pulse compression is automatically formed a large current arc, greater penetration, the groove can be smaller, increase productivity, reduce costs.
4. The small current has a cold arc welding process.
5. Can replace TIG bottom welding, and the speed is 4~5 times of argon arc welding.
6. The wire feeding is more stable and the arc length is stable.
7. Double pulse vertical welding, fast speed and beautiful appearance.
About the author: Jiang Dianzhong, Hubei Jinggong Steel Structure Co., Ltd., an engineer, mainly engaged in the research and construction of construction steel structure technology and application.
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