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900 MPa-grade high-strength high-toughness low-hydrogen welding rod and preparation method thereof

A low-hydrogen electrode and high-toughness technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of high price and long procurement cycle, and achieve the effects of moderate length, good slag removal and easy arc ignition

Active Publication Date: 2020-12-18
CFHI DALIAN HYDROGENANT REACTOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Eurofa Air Liquide Welding Group can provide high-toughness welding rods with 0.2% yield strength higher than 790MPa, but the price is high and the procurement cycle is long, which cannot meet the urgent needs of production
[0003] The invention patent with the patent number of 2016107787303 discloses a 790MPa high-strength and high-toughness electrode for hydropower and its preparation method. However, there is still no electrode with a 0.2% yield strength greater than 790MPa in the welded state and an impact energy higher than 69J at -60°C in China. , the development of this electrode is of great significance to promote the rapid development of my country's marine engineering manufacturing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]In the coating composition of the electrode of the present invention, there are 45 parts by mass of carbonate, 18 parts by mass of fluoride, 3 parts by mass of titanium dioxide, 6 parts by mass of quartz, 8 parts by mass of ferrotitanium, 1.3 parts by mass of ferrosilicon, 12 parts by mass of nickel powder, 2.0 parts by mass of ferromolybdenum, 0.6 parts by mass of metallic chromium, 3.0 parts by mass of electrolytic manganese, 1.0 parts by mass of soda ash, and 0.05 parts by mass of ferroboron.

[0037] The composition percentage of deposited metal is C 0.047%, Si 0.30%, Mn 1.44%, P 0.006%, S0.003%, Cr 0.27%, Ni 5.42%, Mo 0.46%.

[0038] Mix the above raw materials evenly, add water glass with a potassium-sodium ratio of 1:1 at 20°C, which accounts for 20-23% of the solid component mass content, and the Baume density is 41-43Be, and perform wet mixing, using H08HR welding core Welding rod preparation is carried out on hydraulic welding rod production equipment. The ele...

Embodiment 2

[0041] Others are the same as in Example 1, except that in the composition of the coating, 42 parts by mass of carbonate, 22 parts by mass of fluoride, 4 parts by mass of titanium dioxide, 4 parts by mass of quartz, 7 parts by mass of ferrosilicon, and 2.0 parts by mass of ferrosilicon , 10 parts by mass of nickel powder, 1.6 parts by mass of ferromolybdenum, 0.8 parts by mass of metallic chromium, 4.1 parts by mass of electrolytic manganese, 0.8 parts by mass of soda ash, and 0.15 parts by mass of ferroboron.

[0042] The composition percentage of deposited metal is C 0.053%, Si 0.42%, Mn 1.55%, P 0.006%, S0.003%, Cr 0.36%, Ni 4.61%, Mo 0.42%.

Embodiment 3

[0044] Others are the same as in Example 1, except that in the composition of the coating, 38 parts by mass of carbonate, 24 parts by mass of fluoride, 6 parts by mass of titanium dioxide, 3 parts by mass of quartz, 6 parts by mass of ferrosilicon, and 1.4 parts by mass of ferrosilicon , 8 parts by mass of nickel powder, 2.4 parts by mass of ferromolybdenum, 0.3 parts by mass of metallic chromium, 5 parts by mass of electrolytic manganese, 0.6 parts by mass of soda ash, and 0.1 parts by mass of ferroboron.

[0045] The composition percentage of deposited metal is C 0.050%, Si 0.36%, Mn 1.65%, P 0.006%, S0.003%, Cr 0.21%, Ni 4.51%, Mo 0.52%.

[0046] When the 900MPa high-strength, high-toughness and low-hydrogen electrode of the present invention is used for welding, the arc is stable, there is basically no spatter, the slag detachment is good, the all-position welding performance is excellent, the weld shape is beautiful, and the weld bead height is moderate. In the welding te...

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Abstract

The invention provides a 900 MPa-grade high-strength high-toughness low-hydrogen welding rod and a preparation method thereof. The 900 MPa-grade high-strength high-toughness low-hydrogen welding rod is composed of a core wire and a coating wrapping the outer layer of the core wire. The coating comprises, by weight, 38-45 parts of carbonate, 18-24 parts of fluoride, 3-6 parts of titanium dioxide, 3-6 parts of quartz, 6-8 parts of ferrotitanium, 1.3-2.0 parts of ferrosilicon, 8-12 parts of nickel powder, 1.6-2.4 parts of ferromolybdenum, 0.3-0.8 part of chromium metal, 3-5 parts of electrolyticmanganese, 0.6-1.0 part of sodium carbonate and 0.05-0.15 part of ferro-boron. The welding rod is good in coating and pressing performance, smooth and compact in surface, high in yield and free of eccentricity. During welding, welding arcs are stable, splashing is little, welding lines are fine, wettability of a weld bead and the two sides of a groove is good, and a slag shell can automatically fall off. All-position welding performance is excellent, and weld joint forming is attractive.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a 900MPa grade high-strength, high-toughness low-hydrogen welding rod and a preparation method thereof. Background technique [0002] At present, 690MPa high-strength steel is widely used in the field of marine engineering, and many domestic welding consumable manufacturers have also developed matching welding consumables. In order to further reduce the weight of the platform, 790MPa-grade high-strength steel for marine engineering is being developed in China (0.2% yield strength ≥ 790MPa, tensile strength 880-1020MPa, elongation ≥ 14%, -60°C impact energy ≥ 69J). In order to cooperate with the application of this type of steel and avoid the passive situation of using imported welding consumables for domestic steel, it is necessary to simultaneously carry out the localization of its supporting welding consumables. At present, Eurofa Air Liquide Welding Group can provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365B23K35/368B23K35/40
CPCB23K35/365B23K35/368B23K35/40
Inventor 刘学利张秀海高蕊李兆峰王富铭
Owner CFHI DALIAN HYDROGENANT REACTOR
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