790 MPa-grade high-strength and high-toughness welding rod for water and electricity and preparation method thereof

Abstract

The invention discloses a 790 MPa-grade high-strength and high-toughness welding rod for water and electricity and a preparation method thereof. The welding rod consists of low sulfur, a phosphorus welding core, and a cover for coating the surface of the welding core; and the cover includes 40-42 mass parts of carbonate, 15-18 mass part of fluoride, 4.5-7.5 mass parts of rutile, 10-12 mass parts of silicon dioxide, 6-8 mass parts of nickel powder, 2.3-2.7 mass parts of molybdenum iron, 6-8 mass parts of electrolytic manganese, 8-10 mass parts of iron powder, 0.5-1.0 mass part of pure soda, 1.5-2.0 mass parts of sodium alginate, and 0.10-0.15 mass part of graphite. Compared with the prior art, the welding rod is stable in arc, low in splashing, excellent in deslagging, free of downwards flowing welding molten iron in vertical and pitching positions, easy to remove slag, beautiful in molding and excellent in all-position operation performance.

Description

technical field

[0001] The invention relates to the field of welding materials, in particular to an all-position welding manual electrode for supporting 790MPa grade high-strength and high-toughness steel used in hydropower engineering construction and a preparation method thereof. Background technique

[0002] Major hydropower projects planned to be constructed in the lower reaches of the Jinsha River during the country's "Twelfth Five-Year Plan" period: Wudongde and Baihetan Hydropower Stations. Wudongde Hydropower Station is the first cascade of four hydroelectric cascades in the downstream section of the Jinsha River Hydropower Base - Wudongde, Baihetan Hydropower Station, Xiluodu Hydropower Station and Xiangjiaba Hydropower Station. The installed capacity of the power station is 10.2 million kilowatts. It is conducive to improving and exerting the benefits of the downstream cascades, and increasing the guaranteed output and power generation of the downstream cascade pow...

Examples

Embodiment 1

[0034] The coating used in the welding rod of the present invention is mainly carbonate, fluoride and alloy, and a small amount of rutile and pressure-coating substances are added at the same time. The components and their parts by mass are as follows: 40 parts by mass of carbonate, 16 parts by mass of fluoride, 7 parts by mass of rutile, 10 parts by mass of silicon dioxide, 7.5 parts by mass of nickel powder, 2.3 parts by mass of ferromolybdenum, 6.5 parts by mass of electrolytic manganese parts by mass, 10 parts by mass of iron powder, 0.8 parts by mass of soda ash, 1.8 parts by mass of sodium alginate, and 0.12 parts by mass of graphite.

[0035] The deposited metal composition is: C: 0.065%, Mn: 1.32%, Si: 0.20%, S: 0.005%, P: 0.008%, Cr: 0.04%, Ni: 2.83%, Mo: 0.63%, Cu: 0.016% .

[0036] Mix the above raw materials evenly, add water glass with a potassium-sodium ratio of 1:1 at 20°C, accounting for 21-23wt% of the solid component mass content, and perform wet mixing with...

Embodiment 2

[0038]Others are the same as in Example 1, but the mass parts of the coating are composed as follows: 42 parts by mass of carbonate, 15 parts by mass of fluoride, 7.5 parts by mass of rutile, 11 parts by mass of silicon dioxide, 6 parts by mass of nickel powder, 2.5 parts by mass of ferromolybdenum parts by mass, 8 parts by mass of electrolytic manganese, 8 parts by mass of iron powder, 1.0 parts by mass of soda ash, 2.0 parts by mass of sodium alginate, and 0.10 parts by mass of graphite.

Embodiment 3

[0040] Others are the same as in Example 2, but the mass parts of the coating are composed as follows: 41 parts by mass of carbonate, 16 parts by mass of fluoride, 5.5 parts by mass of rutile, 12 parts by mass of silicon dioxide, 6 parts by mass of nickel powder, 2.7 parts by mass of ferromolybdenum parts by mass, 7 parts by mass of electrolytic manganese, 8.5 parts by mass of iron powder, 1.0 parts by mass of soda ash, 2.0 parts by mass of sodium alginate, and 0.15 parts by mass of graphite.

[0041] The 790MPa grade high-strength and high-toughness steel electrode for hydropower that implements 1-3, when using DC reverse welding (the base metal is 790MPa grade steel), the arc is stable, basically no spatter, good slag removal, excellent all-position welding performance, and the weld seam The shape is beautiful, and the height of the weld bead is moderate. The mechanical properties of the deposited metal are: yield strength Rp0.2: 725Mpa, tensile strength Rm: 812Mpa, elongati...

technical field

[0001] The invention relates to the field of welding materials, in particular to an all-position welding manual electrode for supporting 790MPa grade high-strength and high-toughness steel used in hydropower engineering construction and a preparation method thereof. Background technique

[0002] Major hydropower projects planned to be constructed in the lower reaches of the Jinsha River during the country's "Twelfth Five-Year Plan" period: Wudongde and Baihetan Hydropower Stations. Wudongde Hydropower Station is the first cascade of four hydroelectric cascades in the downstream section of the Jinsha River Hydropower Base - Wudongde, Baihetan Hydropower Station, Xiluodu Hydropower Station and Xiangjiaba Hydropower Station. The installed capacity of the power station is 10.2 million kilowatts. It is conducive to improving and exerting the benefits of the downstream cascades, and increasing the guaranteed output and power generation of the downstream cascade pow...

Examples

Embodiment 1

[0034] The coating used in the welding rod of the present invention is mainly carbonate, fluoride and alloy, and a small amount of rutile and pressure-coating substances are added at the same time. The components and their parts by mass are as follows: 40 parts by mass of carbonate, 16 parts by mass of fluoride, 7 parts by mass of rutile, 10 parts by mass of silicon dioxide, 7.5 parts by mass of nickel powder, 2.3 parts by mass of ferromolybdenum, 6.5 parts by mass of electrolytic manganese parts by mass, 10 parts by mass of iron powder, 0.8 parts by mass of soda ash, 1.8 parts by mass of sodium alginate, and 0.12 parts by mass of graphite.

[0035] The deposited metal composition is: C: 0.065%, Mn: 1.32%, Si: 0.20%, S: 0.005%, P: 0.008%, Cr: 0.04%, Ni: 2.83%, Mo: 0.63%, Cu: 0.016% .

[0036] Mix the above raw materials evenly, add water glass with a potassium-sodium ratio of 1:1 at 20°C, accounting for 21-23wt% of the solid component mass content, and perform wet mixing with...

Embodiment 2

[0038]Others are the same as in Example 1, but the mass parts of the coating are composed as follows: 42 parts by mass of carbonate, 15 parts by mass of fluoride, 7.5 parts by mass of rutile, 11 parts by mass of silicon dioxide, 6 parts by mass of nickel powder, 2.5 parts by mass of ferromolybdenum parts by mass, 8 parts by mass of electrolytic manganese, 8 parts by mass of iron powder, 1.0 parts by mass of soda ash, 2.0 parts by mass of sodium alginate, and 0.10 parts by mass of graphite.

Embodiment 3

[0040] Others are the same as in Example 2, but the mass parts of the coating are composed as follows: 41 parts by mass of carbonate, 16 parts by mass of fluoride, 5.5 parts by mass of rutile, 12 parts by mass of silicon dioxide, 6 parts by mass of nickel powder, 2.7 parts by mass of ferromolybdenum parts by mass, 7 parts by mass of electrolytic manganese, 8.5 parts by mass of iron powder, 1.0 parts by mass of soda ash, 2.0 parts by mass of sodium alginate, and 0.15 parts by mass of graphite.

[0041] The 790MPa grade high-strength and high-toughness steel electrode for hydropower that implements 1-3, when using DC reverse welding (the base metal is 790MPa grade steel), the arc is stable, basically no spatter, good slag removal, excellent all-position welding performance, and the weld seam The shape is beautiful, and the height of the weld bead is moderate. The mechanical properties of the deposited metal are: yield strength Rp0.2: 725Mpa, tensile strength Rm: 812Mpa, elongati...