Low-hydrogen basic electrode for 1Ni9 low-temperature steel welding and preparation method of low-hydrogen basic electrode

Abstract

The invention provides a low-hydrogen basic welding electrode for 1Ni9 low-temperature steel welding. The low-hydrogen basic welding electrode comprises a welding core and a coating, wherein the welding core consists of the following components in percentage by mass: 0.01 to 0.03 percent of carbon, 0.5 to 0.9 percent of manganese, 0.2 to 0.4 percent of silicon, 21 to 24 percent of chromium, 2.5 to 3.5 percent of iron, 8.5 to 9.5 percent of molybdenum, 0.02 to 0.04 percent of titanium, 4 to 4.5 percent of niobium, 0.15 to 0.20 percent of nitrogen, at most 0.01 percent of sulfur, at most 0.01 percent of phosphorus and the balance of nickel; the coating comprises the following components in percentage by mass: 34 to 48 percent of marble, 17 to 24 percent of fluorite, 2 to 6 percent of zircon sand, 1 to 4 percent of ferrosilicon, 5 to 12 percent of ferrotitanium, 3 to 5 percent of mid-carbon ferromanganese, 2 to 5 percent of titanium dioxide, 2 to 5 percent of rutile, 2 to 6 percent of mica, 0.7 to 1 percent of alkali and 1 to 3 percent of mixed rare earth, and the sum of the mass percentage of the components is 100 percent. The low-hydrogen basic electrode provided by the invention solves the problems of poorer performance and high import price of existing welding electrodes.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a low-hydrogen basic electrode for welding 1Ni9 low-temperature steel, and also relates to a preparation method of the electrode. Background technique [0002] 1Ni9 steel is a low-carbon medium alloy steel with a nickel content of 9% and a carbon content of less than 0.13%. It has excellent strength, toughness and weldability at -196°C. Compared with stainless steel with excellent performance, 1Ni9 steel has the advantages of less alloy content and lower price; compared with aluminum alloy for low temperature, it has the advantages of large allowable stress and small thermal expansion rate. With the rapid development of the fan industry, 1Ni9 steel is widely used as the impeller material in the fan industry due to its good low temperature performance. Now the fan impeller is usually connected to the disc and the blade by welding. The welding quality of the i...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-hydrogen alkaline electrode for welding 1Ni9 low-temperature steel, which solves the problem that the existing electrode used for welding 1Ni9 steel needs to be imported from abroad, which is expensive and has poor performance

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